dialog listlengths 4 30 | title stringlengths 15 150 | category stringclasses 14
values | dialog_time stringdate 2016-01-21 01:59:30 2018-07-01 01:34:46 |
|---|---|---|---|
[
{
"message": "I try to use clip vector by polygon in pyqgis.My code (minimal working example)<pre><code> import sys from qgis.core import * import qgis.utils QgsApplication.setPrefixPath(\"/usr\",True) qgs = QgsApplication([],True) qgs.initQgis() # load base layer blayer = QgsVectorLayer... | how to use pyqgis processing runalg clipvectorsbypolygon | gis | 2017-05-02T18:53:43.137 |
[
{
"message": "So I'm following steps in another topic that seems to date to January of this year and is exactly what I want to do, here's the link: <a href=\"https://gis.stackexchange.com/questions/223992/get-drainage-basin-of-a-polygon-with-qgis-grass-or-other-foss\">Get drainage basin of a polygon and at one... | Does r.stream.basin still exist? GRASS-QGIS2.18.7 | gis | 2017-05-02T19:15:26.390 |
[
{
"message": "So I have a gdb, and the feature class I'm working on has a field that is formatted in html for ArcGISOnline. This is great if I'm only viewing the data online. What I'm trying to do is copy that attribute data to a new field and then convert the data from html. There is a great tool that does thi... | iterate through all features and CalculateField with function | gis | 2017-05-02T22:11:54.387 |
[
{
"message": "I am trying to add GeoJSON data into MongoDB, but some of the GeoJSON shapes are failing due to the following error:<code>com.mongodb.MongoWriteException: Can't extract geo keys: ...Loop 1 shares more than one vertex with its parent loop 0</code>Here is an example GeoJSON for which this occurs.<a ... | Problem adding GeoJSON to MongoDB: Loop shares more than one vertex with its parent loop | gis | 2017-05-02T23:28:03.383 |
[
{
"message": "I'm currently running a virtual machine on amazon EC2 and planning to do some web-gis service through it. I installed the QGIS remotely but apparently I can't run it from my local machine through ssh, below is the message I got: <pre><code>QGIS starting in non-interactive mode not supported.You ar... | remote access to virtual machine can't open qgis | gis | 2017-05-03T01:01:28.533 |
[
{
"message": "Sometimes when I run a Python script from IDLE that uses the ArcPy installed with ArcGIS Pro 1.4.1 the script will abort with <code>RuntimeError: Not signed into Portal</code>:<pre><code>RESTART: C:\\temp\\test.py Traceback (most recent call last): File \"C:\\temp\\test.py\", line 9, in <modul... | Avoiding arcgisscripting RuntimeError: Not signed into Portal from ArcPy with ArcGIS Pro? | gis | 2017-05-03T02:40:34.520 |
[
{
"message": "I recently bought a BU-353 G-STAR IV GPS receiver (common low cost GPS receiver in market). The update frequency according to the data sheet is 1 Hz. I set a baud rate of 4800 first and then 9600. But the map shows new position only after walking for 15 to 20 meters. Is this the norm? Is this beca... | How to improve the resolution of low cost GPS dongle? | gis | 2017-05-03T06:44:12.507 |
[
{
"message": "I want to alter text elements in a layout. This text elements were grouped. Grouped elements behave like GraphicElement and it is possible to query the property isGroup. I can not alter these text elements before ungrouping.<a href=\"https://i.stack.imgur.com/6SESu.jpg\" rel=\"nofollow noreferrer\... | Ungroup ArcMap Graphic Elements in Layout using ArcPy | gis | 2017-05-03T08:47:57.390 |
[
{
"message": "I have a new account in Carto (using Builder). I have found several examples using SQL filters. But when I apply them to my map, they do not work. Could it be related to the domain change on the API call?Anyone know how to apply a SQL filter using CARTO.js and CARTO Builder <code>vizjson</code> an... | Apply filter sql on map CARTO.js using a Builder vizjson | gis | 2017-05-03T15:35:24.267 |
[
{
"message": "When points are overlapping, there is this property which allow to automatically display the lot of them separately around where they are, called 'Point displacement'. But it doesn't work for lines, even so it seems to me quite conceptually feasable in order to achieve something like that :<a href... | Shifting display of overlapping lines in QGIS? | gis | 2017-05-04T06:52:52.990 |
[
{
"message": "I am quite new to working in the prompt for image analysis and data handling, so I realize this might very well be a very silly problem. In any occasion, I am using my tutor's code in order to radiometrically, atmospherically and topographically correct my images, which are in .tif format. I want ... | Loading satellite spectral bands in Ipython error | gis | 2017-05-04T11:06:21.193 |
[
{
"message": "I'm working on plugin updating existing shapefile by adding new features to it. And I have a problem with signal that hasn't been emitted by QGIS, when I've added features to layer, using dataProvider().addFeatures(). I'm pretty sure that I have defined correctly connection signal and function, wh... | No "committedFeaturesAdded" signal after dataProvider().addFeatures() - QGiS 2.14.8 | gis | 2017-05-04T12:01:43.887 |
[
{
"message": "I'm pretty new with Carto. I have worked with Carto Editor one time in the past, but in Carto Builder I'm missing the \"Merge -> column join\" option.I tried to create a map by using the two data sets I have (geodata from my city in Germany) and a dataset with statistics structured by zip codes. I... | Carto Builder: No geo reference | gis | 2017-05-04T15:17:42.420 |
[
{
"message": "I have this code to know if a toolbar is displaying: <pre><code>IApplication m_aplication = ArcMap.Application;ICommandBar versionToolbar = GetToolbarByName(m_aplication, \"esriArcMapUI.VersionToolbar\");if (versionToolbar.IsVisible()){ versionToolbar.Dock(esriDockFlags.esriDockHide);}</code></... | ArcMap event to detect when a toolbar open/close with ArcObjects? | gis | 2017-05-04T15:23:05.937 |
[
{
"message": "I'm trying to see if I can catch among other things a self-intersection which involves a start / end point of a geometry feature self-intersecting some other part of the same feature. Obviously the start and end points of a proper feature will be the same.I ask because I've heard some tools ignor... | Does PostGIS Catch Self-Intersections Involving the Start / End points to a Line or Area? | gis | 2017-05-04T19:05:55.767 |
[
{
"message": "This code adds a <code>QgsPoint</code> to a layer. But how to increase the size of feature ? <pre><code>layer = QgsVectorLayer('Point', 'points' , \"memory\")pr = layer.dataProvider()pt = QgsFeature()point1 = QgsPoint(-4080198.52,1492348.027)pt.setGeometry(QgsGeometry.fromPoint(point1))pr.addFeat... | Resize feature with PyQGIS | gis | 2017-05-05T04:12:40.813 |
[
{
"message": "When I use the GetGeomType() with GDAL/OGR it returns an integer. I want to know what geometry type each integer represents.<pre class=\"lang-py prettyprint-override\"><code>driver = ogr.GetDriverByName(\"FileGDB\")gdb = r\"C:\\Users\\******\\Documents\\ArcGIS\\Default.gdb\"ds = driver.Open(gdb, 0... | GDAL/OGR (Python) GetGeomType() method returns integer, what is the matching geom type? | gis | 2017-05-05T08:29:22.087 |
[
{
"message": "Trying to polygonize large rasters* but since the process is taking forever/crashing in GDAL, I am resorting to doing so in ArcGIS. However there is a 2GB limit on shapefiles in Arc so I am taking a combination approach where I split the rasters into 4 parts with gdalwarp, polygonize them in ArcGI... | Dissolve multiple shapefiles so that touching polygons become one: GDAL/OGR | gis | 2017-05-05T19:42:08.597 |
[
{
"message": "I am trying to remove a layer from the mapView. <pre><code>var LayertoRemove=map.findLayerById(layerID);map.remove(LayertoRemove);</code></pre>The layer is found and is actually removed, but after it's removed it continues to throw TypeError: this.controller.destroy is not a function, and the rest... | map.remove throws type error after removing teh layer in ArcGIS JS API 4.3 | gis | 2017-05-05T19:50:43.917 |
[
{
"message": "I want to calculate the Moran I value of a geojson file through python. Recently I am trying to use <a href=\"http://pysal.readthedocs.io/en/latest/index.html\" rel=\"nofollow noreferrer\">pysal and I find that I need to get the a spatial weight to realize it. But from the <a href=\"http://pysal.r... | Spatial weight for PySAL from a geojson file or geodataframe? | gis | 2017-05-06T13:48:20.170 |
[
{
"message": "I am trying to understand how a typical tile server is implemented in practice. I am not considering setting up a tile server but rather trying to understand from a conceptual point of view the algorithms behind a typical tile server.So for example, as a starting point, a tile server receives a r... | How is a minimal tile server implemented? | gis | 2017-05-06T17:25:17.467 |
[
{
"message": "What I want to do is pretty straight forward: I have two raster with the same crs, resolution and extent. Both rasters show the number of days an area is flooded so they just have two values. Raster a consists of 0 and 183; raster b of 0 and 149. Logically, the area that is flooded only 149 days (... | Replacing 0 values of a raster with values from another raster in QGIS? | gis | 2017-05-06T21:45:19.463 |
[
{
"message": "I have just installed QGIS 2.18 and was dismayed to find that \"open attribute table\" no longer displays data in a tabular format. Instead I get list of 'filter' values with a check box and the rest of the pane taken up with the details of the selected value as a form.I have just looked at the 2... | Tabular display of features not working as expected in QGIS? | gis | 2017-05-07T02:42:51.797 |
[
{
"message": "<a href=\"http://www.archiescampings.eu/\" rel=\"nofollow noreferrer\">Archie's Campings offers a pretty thorough list of campsites in Europe.Problem is, files are only country-size, so the number of waypoints is overwhelming (<a href=\"https://s7.postimg.org/4mck58dbf/Archie.s.Campings.UK.png\" r... | Tool to only keep POIs X kms from a route? | gis | 2017-05-08T09:35:48.910 |
[
{
"message": "I am working in a simulation using NetLogo, the idea is to make the agents interact inside the roads of a simplified city, in order to do that I need to use some algorithms to find the fastest path between two points in the city (for example Dijkstra or A*), and to do that I need to work with a g... | How to convert a shapefile into a graph in which use Dijkstra | gis | 2017-05-08T19:30:38.387 |
[
{
"message": "Is there a descending order of <code>VendorOption:SortBy</code>?What is z-ordering?<blockquote> It is a common need to perform road casing against a complex road network, which can have its own z-ordering needs (e.g., over and under passes).</blockquote>For example: <code><VendorOption name=\"... | Descending order of VendorOption:sortBy? | gis | 2017-05-09T01:36:10.640 |
[
{
"message": "The script (helped by @BERA and badly added to by me *completely new to coding) iterates through the fields in a polygon attribute table to convert to a temporary raster (for different scenarios in the cost analysis) and then do a cost analysis on each raster. I need the resulting accumulated cos... | How to define inputs that are the result of an iteration? Python ArcGIS | gis | 2017-05-09T12:42:54.927 |
[
{
"message": "I'm trying to understand the concept of the Orientation of the Minimal Bounding Geometry: Minimum Bounding Geometry (Data Management toolbox, ArcGIS Desktop 10.1).I run the tool Minimal Bounding geometry -> Rectangle_by_width -> \"Add geometry characteristics as attributes to output\". For every p... | MBG_Orientation: ranges from 0-180, instead of 0-360? (ArcGIS, Minimal Bounding Geometry) | gis | 2017-05-09T17:51:27.717 |
[
{
"message": "The following code in arcpy is used to convert a dwg file into shapefile and it works perfectly when you run it within ArcMap:<pre><code>import sys, zipfile, arcpy, os, tracebackfrom arcpy import env# Set environment settingsenv.workspace = \"C:/GISApplication/GIS/Layer_Updated_Drawings\"# Set loc... | Converting dwg to shapefile using arcpy and ArcGIS js | gis | 2017-05-10T10:12:29.720 |
[
{
"message": "I'm trying to update a column <code>wkb_geometry</code> in a table <code>locations</code> by creating a point from the <code>eastings</code> and <code>northings</code> cols from the same table. The database is <code>PostGreSQL</code> with <code>PostGIS</code> extension:<pre><code>UPDATE locationsS... | PostGIS: Update table with st_geometryfromtext | gis | 2017-05-10T11:44:42.417 |
[
{
"message": "I have run the viewshed plugin in QGIS to query which areas of ground any of my target points might be visible from. The result of this query is a raster tiff file with 'Band 1' value = 0 where no points can be seen, varying right up to 'Band 1' value = 172, where all my points can be seen.I want ... | QGIS Viewshed Analysis Colours | gis | 2017-05-11T08:53:07.350 |
[
{
"message": "I'm trying to import kml file and style them.In my KML, we have different styles for example<pre><code><Style id=\"YellowPolyStyle\"> <LabelStyle> <color>00000000</color> <scale>0</scale> </LabelStyle> <Balloon... | Leaflet Omnivore - KML fill and stroke colors are always the default blue | gis | 2017-05-11T11:57:04.677 |
[
{
"message": "How to save changing of colors?For example, we change color for all features of a layer in a loop. But as a result, I see only latest changing.My code does not work perfectly:<pre><code>for k in masLevel: iface.mapCanvas().setSelectionColor( QColor(colours[k-1]) ) #filter features ... | How to change colors for layers? | gis | 2017-05-11T12:20:25.570 |
[
{
"message": "I have a feature class in an ESRI file geodatabase where I have isolated one feature. When I copy the feature class to a oracle db (ST_Geometry as defaults; by copy and paste; also fails with gp tools or by python cursor) I get the error \"Shape integrity error\". Copying the feature or the featur... | ArcMap: Copying features class to Oracle DB fails: Shape integrity error | gis | 2017-05-11T14:23:20.297 |
[
{
"message": "I'm working with data driven pages and need to create a unique text element on every page. Each text element you add to a data driven page gets added to every subsequent and previous page. Is there a way around this? The workaround I've been using is to create the unique note on each page using Bl... | Unique Text Element per Data Driven Page | gis | 2017-05-11T14:27:32.697 |
[
{
"message": "I am using QGIS 2.14.14. I am styling point markers in a layer that I imported using \"Add Delimited Text Layer\". I want to style the markers based on three properties:Color of marker relates to study nameSize of marker relates to number of soil samples at that location(I have successfully comple... | How to change a marker shape based on a rule or column value in QGIS? | gis | 2017-05-11T19:02:35.070 |
[
{
"message": "I am having trouble exporting my map that has the same quality in the inset. The lines come out blurry.<a href=\"https://i.stack.imgur.com/jXTXx.jpg\" rel=\"nofollow noreferrer\">You can see a big difference between the quality. Any ideas?",
"role": "user"
},
{
"message": "Transparen... | Exporting inset map with same quality in ArcGIS Desktop? | gis | 2017-05-11T20:28:16.873 |
[
{
"message": "I need a quick way to create rectangles with set with & height in meters. Is there a straightforward way to do this? I am well aware that there are a number of ways to achieve this, but all that I have found (apart from the QAD plugin) are cumbersome workarounds. The keyword here is quick and ... | Create rectangle by entering width & height numerically in QGIS? | gis | 2017-05-12T12:50:03.560 |
[
{
"message": "I'm working on setting up the TIGER geocoder on a Linux machine. I have installed PostgreSQL and PostGIS, now I'm working on the extension, point 2.8.1 of this <a href=\"http://postgis.net/docs/manual-dev/postgis_installation.html#loading_extras_tiger_geocoder\" rel=\"nofollow noreferrer\">guide:I... | Loader_Generate_Nation_Script is not creating the scripts | gis | 2017-05-12T14:27:34.397 |
[
{
"message": "I have a print template that is used with the Export Web Map task. This print template contains place-holder fields that are replaced with actual values when the web map JSON is sent to the task for PDF generation. I have the place-holder fields being replaced with the real values but I need to a... | Combining static text and dynamic text into single field? | gis | 2017-05-12T20:14:58.300 |
[
{
"message": "I have been trying to get to some county data from geocomm.com but the website has been down for several days. Does anyone have information regarding their status?",
"role": "user"
},
{
"message": "As far as I can tell, <code>Geocomm.com</code> is hosted by MindSites Group which accord... | Is geocomm.com permanently unavailable? | gis | 2017-05-12T23:19:56.543 |
[
{
"message": "I would like to use <code>grass7:i.image.mosaic</code> algorithm in R using <code>RQGIS</code> packages But I don't understand how I can define itI have 14 rasters named r1:r14. I do <pre><code>params <- get_args_man(alg = \"grass7:i.image.mosaic\")params$input <- paste0(\"r\",1:length(my.ra... | Defining GRASS region in RQGIS? | gis | 2017-05-13T21:05:20.667 |
[
{
"message": "I added a polygon on top of a Google Maps satellite image in QGIS which has a width of roughly 8 kilometres. When I open the respective shapefile in FEFLOW (for groundwater modelling) I see the correct silhouette but the scale is totally wrong (see screengrab below). The overall width is less than... | Wrong polygon scale after export from QGIS into FEFLOW | gis | 2017-05-14T10:44:21.083 |
[
{
"message": "I would like to write a Python expression function which calculates the average of columns (variable length parameters), skipping NULL values.<pre><code>@qgsfunction(args=-1, group='Custom')def col_avg(vals, feature, parent): v = [ x for x in vals if x is not NULL] if len(v): return s... | QGIS Expression function | gis | 2017-05-15T21:00:30.523 |
[
{
"message": "I'm trying to test the TIGER geocoder with the address provided in the <a href=\"https://postgis.net/docs/Geocode.html\" rel=\"nofollow noreferrer\">documentation.This is the sample address I'm testing:<code>75 State Street, Boston MA 02109</code><pre><code>SELECT g.rating, ST_X(g.geomout) As lon,... | Tiger geocoder is not finding results from manually loaded tables | gis | 2017-05-15T21:16:36.343 |
[
{
"message": "I am using <a href=\"https://github.com/CliffCloud/Leaflet.EasyButton\" rel=\"nofollow noreferrer\">easybutton plugin for <a href=\"http://leafletjs.com/\" rel=\"nofollow noreferrer\">leaflet. Is there a possibility to display an image+some text when mouse is over on the button?Here is my current ... | Leaflet EasyButton MouseOver event | gis | 2017-05-16T09:08:04.240 |
[
{
"message": "How can I clip my DEM raster in a irregular shape in QGIS?I have used the clipping tool but it only does rectangles I believe.",
"role": "user"
},
{
"message": "Within QGIS you can use the 'clipper' tool in Raster > Extraction > Clipper. Alternatively, you can use the gdalwarp command ... | Clipping raster with an irregular shape? | gis | 2017-05-16T16:30:47.970 |
[
{
"message": "I am trying to adjust a vector polygon dataset using <a href=\"http://www.gdal.org/ogr2ogr.html\" rel=\"nofollow noreferrer\">ogr2ogr spline transformation with cmd commands like: <pre><code>C:\\\\OSGeo4W64\\\\bin\\\\ogr2ogr.exe -f \"ESRI Shapefile\" C:\\\\path\\\\output.shp -order 3 -tps -gcp -13... | ogr2ogr too many GCP points - exceeds maximum number of characters in the command line | gis | 2017-05-16T17:30:06.490 |
[
{
"message": "I am trying to update a field in a (point) feature class (e.g. subLayer) using attributes and spatial proximity from another (line) feature class. For this, I'm currently leveraging arcpy tools and an update cursor. This is currently taking over 30 minutes to run. The subLayer feature class contai... | Optimizing Field Update - Update Cursor, ArcPy | gis | 2017-05-16T22:35:33.660 |
[
{
"message": "I'm in the process of writing a script that will iterate through multiple MXDs and extract the data from layers that are turned on and only data that is within the data frame extent. Some of the MXDs may have data frames that are not visible on the page. I don't want to extract the data from thes... | Does arcpy have a way to determine if a data frame overlaps a page extent? | gis | 2017-05-17T00:27:54.333 |
[
{
"message": "Don't know what I'm doing wrong; trying to load layers from ArcGIS Server into web using 'ArcGISDynamicMapServiceLayer', can see the basemap but not the layer.see code below:<pre><code><html><head><<title>FeatureLayer</title><link rel=\"stylesheet\" href=\"https://js... | Load ArcGIS Server layers into web using ArcGISDynamicMapServiceLayer JavaScript API | gis | 2017-05-17T09:37:30.587 |
[
{
"message": "I tried <pre><code>>>>QgsVectorLayer.loadNamedStyle(r'C:\\Some\\Path\\FOO.qlr')</code></pre>Get this error:<pre><code>Traceback (most recent call last): File \"<input>\", line 1, in <module>TypeError: arguments did not match any overloaded call: QgsVectorLayer.loadNamedStyle... | Load .qlr with loadNamedStyle | gis | 2017-05-17T10:10:22.387 |
[
{
"message": "So I am trying to join some data I have (just numbers) to a map on QGIS. However it when I try to join the data to map it shows up as a string instead of a real.It's a just a normal exel file. I converted it to a CSV file and was able to join it to my map, however as a CSV file it was still a STRI... | How do I convert a STRING to a Real? | gis | 2017-05-17T15:00:03.470 |
[
{
"message": "So I am trying to join some data I have (just numbers) to a map on QGIS. However it when I try to join the data to map it shows up as a string instead of a real.It's a just a normal exel file. I converted it to a CSV file and was able to join it to my map, however as a CSV file it was still a STRI... | How do I convert a STRING to a Real? | gis | 2017-05-17T15:00:03.470 |
[
{
"message": "I have a collection of nine high-resolution map scans illustrating former borders between two nations. The scale is about 1:13,265 for each of the nine images. I want to georeference these maps using QGIS so that I can trace the historical borders, but I want to know whether processing the images ... | Does cropping and adding an alpha layer to a raster map yield better georeference results? | gis | 2017-05-17T20:14:59.120 |
[
{
"message": "I have little experience with python. I'm using ArcGIS 10.4. I'm attempting to create pdfs of layouts in which polygon features are symbolized with the same colors for classes, but the assignments change in each of 1,000 fields in the feature class. That is, I want to loop through each field (0000... | updateLayer loop with .lyr does not use target field? | gis | 2017-05-17T20:32:12.090 |
[
{
"message": "I calculated the volume of a reservoir using surface volume option in 3D Analyst but it is so much less than the actual volume and the 2D surface is also much less. Why is it so? I don't know what the units are. The coordinate system is WGS_1984.",
"role": "user"
},
{
"message": "Your... | Calculating surface volume in 3D Analyst is giving very small values | gis | 2017-05-18T03:31:29.233 |
[
{
"message": "I am working with ArcGIS 10.4.1 and need to share a map package to someone working with ArcGIS 10.2.2. I am able to save a copy to a lower version ArcGIS i.e 10.1 to 10.2 option. However, to make a map package I still have to reopen this in 10.4.1!How do I go about this?",
"role": "user"
},
... | Sharing ArcMap document to a lower version | gis | 2017-05-18T05:59:47.427 |
[
{
"message": "I have a vector layer with two columns: Code (string) and Area (float/double). The column Code includes some repeated values. I'd like to evaluate for each unique value of Code the maximum value of the Area values which are associated. Similar questions but with different approaches, not suitable ... | Getting the maximum value of a vector field per each unique value of another vector field using PyQGIS? | gis | 2017-05-18T12:56:21.073 |
[
{
"message": "I have a vector layer with two columns: Code (string) and Area (float/double). The column Code includes some repeated values. I'd like to evaluate for each unique value of Code the maximum value of the Area values which are associated. Similar questions but with different approaches, not suitable ... | Getting the maximum value of a vector field per each unique value of another vector field using PyQGIS? | gis | 2017-05-18T12:56:21.073 |
[
{
"message": "I'm splitting a land polygon up in order to shift the centering of the projection to the Pacific ocean. I manage to successfully cut up the original polygon on the 22 meridian, and it looks fine when I do an on-the-fly reprojection with my custom CRS:<a href=\"https://i.stack.imgur.com/W6XjT.jpg\"... | QGIS incorrectly saving polygon with custom CRS, while correctly projecting it on-the-fly | gis | 2017-05-18T19:48:51.600 |
[
{
"message": "I am using the <code>levelplot</code> function of the awesome <code>rasterVis</code> package to create a map whose values diverge around zero. I am plotting a raster file using a red to blue palette, but I am trying to assign grey to zero values in the map.Specifically, I want to reproduce the col... | How to assign colors to specific raster values using R | gis | 2017-05-18T20:57:35.980 |
[
{
"message": "In ArcGIS (using 10.4) I have my layout set up, shapefile A symbolized and labeled. What I need to do is print this layout to pdf, then change the source of shapefile A to the next in aseries of several hundred, have it look the same, change the title, and print the pdf. I'm trying to loop through... | Having trouble replaceDataSource loop in Python | gis | 2017-05-18T21:32:10.970 |
[
{
"message": "I'm trying to add open data from MétéoFrance (French meteorological organisation) as WMS with QGIS 2.18.7 on Windows 7.The URL looks like this, I've added it to my WMS connections (with my valid token):<pre><code>https://geoservices.meteofrance.fr/api/TOKEN/ClimNormalesWMORes40EssMetroWMS?SERVICE=... | QGIS 2.18.7: How can I change or add WMS parameters? | gis | 2017-05-19T08:03:08.907 |
[
{
"message": "Before <code>QgsMapRenderer</code> was deprecated if we wanted to activate OTF we used code like this:<pre><code>canvas = QgsMapCanvas()canvas.mapRenderer().setProjectionsEnabled(True)</code></pre>Currently, <code>QgsMapRenderer</code> is divided into two classes <code>QgsMapSettings</code> and <c... | How to turn on the 'on-the-fly' functionality with PyQGIS? | gis | 2017-05-19T11:12:56.247 |
[
{
"message": "I'm trying to run this query:<pre><code>SELECT round(ST_Distance_Sphere( ((ST_GeomFromText('POINT(:lat :lon)',4326))), (SELECT wkb_geometry FROM coastline ORDER BY wkb_geometry <-> ((ST_GeomFromText('POINT(:lat :lon)',4326))) LIMIT 1 ) ))as Distance;</code></pre>As you can see, I... | Using named placeholders on query | gis | 2017-05-19T13:16:11.490 |
[
{
"message": "I am quite new to QGIS and need some help with this.Basically I have the coordinates of a piece of land which I can find both through Google Earth and my country's mapping service website. I downloaded a .ECW file with an (raster) orthophotomap from the grid of rectangles of the country where the... | Extracting contour lines from ortophoto map | gis | 2017-05-19T15:51:31.250 |
[
{
"message": "I have the coordinates of a point on Earth and I want to know the coordinates of a point that is at a distance in meters from the first point in an angle in degrees from the north but I haven't found the way to do it.Does anyone know how to do it?",
"role": "user"
},
{
"message": "This... | How to compute latitude and longitude of a point at a distance from another point in some direction? | gis | 2017-05-20T05:22:22.290 |
[
{
"message": "Although I've a regular r user I have only ever computed GWR in arcgis, and now I'm using R I'm just a little confused.I seem to have got my GWR results and now need to go about plotting them on a map. I did this GWR on a spatial points data frame, which I would usually join spatially to a separat... | How to plot output from GWR in R | gis | 2017-05-20T12:12:11.443 |
[
{
"message": "I am planning to perform a least-cost path analysis in ArcGIS 10.1 (advanced license) by means of Path Distance tool. I am taking into account a large area, corresponding to the Mediterranean basin. I am planning to use wind direction as an horizontal factor in the estimation of anisotropic least-... | Which projection when dealing with least-cost path estimation across the Mediterranean area? | gis | 2017-05-21T15:58:31.677 |
[
{
"message": "I want to extract nodes from polygon in Postgis like it QGIS \"extract nodes\" tool does. I've red the answered question about this in <a href=\"https://gis.stackexchange.com/questions/136326/whats-the-postgis-equivalent-to-extract-nodes-in-ftools-qgis\">What's the PostGIS equivalent to Extract No... | extract separate nodes in Postgis equivalent QGIS | gis | 2017-05-22T10:53:02.370 |
[
{
"message": "I'm trying to create a label in the QGIS composer which automatically displays the Composer name (or window name may do the same thing).For example, I can display the project filename by using @project_filename but I cannot determine how to display the composer name.",
"role": "user"
},
{
... | Composer Title variable in QGIS | gis | 2017-05-22T11:13:42.487 |
[
{
"message": "I am working with rather large data frames that I often need to do a spatial join on. The fastest way I have come up with so far is this method:<pre><code>library(rgdal)download.file(\"http://gis.ices.dk/shapefiles/ICES_ecoregions.zip\", destfile = \"ICES_ecoregions.zip\")unzip(\"ICES... | Efficient spatial joining for large dataset in R | gis | 2017-05-22T11:47:04.307 |
[
{
"message": "Objective: Calculate best route (hiking distance/difficulty) from point A to point B using mostly trails and non-trail terrain, but not walking in a big river. B is not necessarily on a trail. In real life: Point A: trailhead in a park. Point: Benchmark or control point monument somewhere in the p... | ArcGIS tools for hiking distance calculations | gis | 2017-05-22T22:21:20.923 |
[
{
"message": "There is a Map composer with created map. I want to \"Add group\" to Legend - it appears in the Legend Properties, but not in Legend on the map. <a href=\"https://i.stack.imgur.com/Hd5Ni.png\" rel=\"nofollow noreferrer\">I am using QGIS 2.18.8. This problem was also in 2.16 version. Am I missing s... | Adding group in Legend in QGIS Map composer? | gis | 2017-05-23T06:18:24.467 |
[
{
"message": "Though there are many answers to this question on the Web, I've found none that are recent or correct. The prevailing view seems to be that one exports a KMZ from Google Maps which one then edits in Google Earth where it is supposed to be possible to simply drag an element from one folder to anoth... | How do I combine layers in Google Maps? | gis | 2017-05-23T12:55:49.740 |
[
{
"message": "First I have opened a GeoJSON file in QGIS, gives the Labels name, the map is for the Aurangabad district (of India), and there are eight talukas. I want to display the four talukas that are growing a bajra crop. So I have coloured the four talukas and using \"Text Annotation\" I have put some inf... | How to fix the position of map in QGIS after save the file and don't change any colors in selected feauture polygons? | gis | 2017-05-24T07:37:53.623 |
[
{
"message": "QGIS 2.18.5I've done this in the past but I can't remember how I did it! I'm saving a point layer as a kml and trying to bring over the attribute data across with the kml. I've got some screenshots of the result from the past:<a href=\"https://i.stack.imgur.com/VMTbC.jpg\" rel=\"nofollow noreferre... | Save QGIS point layer as KML and retain attribute table | gis | 2017-05-24T15:52:30.000 |
[
{
"message": "The clipper lib has an amazing function to create a strictly simple polygon (definition below).Is it possible to do this in simple features (pref postgis or shapely)?<code>A strictly simple polygon is a simple polygon that does not contain 'touching' vertices, or 'touching' edges.</code><a href=\"... | Create Strictly Simple Polygon in PostGIS/Shapely | gis | 2017-05-24T18:56:48.167 |
[
{
"message": "Using ArcGIS Javascript API, we have a custom widget to allow user to select his role to analyse the data on the Map. I must display the \"Role : XXXX\" on top right of the Map. This should be visible to the user always. \"Role: \" is static & \"XXXX\" is dynamic as and when user changes his r... | Displaying static and dynamic content on top of Map using ArcGIS API for JavaScript? | gis | 2017-05-25T08:30:31.700 |
[
{
"message": "I want to compute the fewest turns and fewest accumulative angle change from a single origin to a set of destinations.The origin and destinations are shown on this map. The flag is the origin, all the other points labelled with a number are the destinations. <a href=\"https://i.stack.imgur.com/lum... | I want to compute the fewest turns and fewest accumulative angle change from a single origin to a set of destinations | gis | 2017-05-25T10:26:33.043 |
[
{
"message": "The elevation of that (project) particular landform cannot be negative (I think). Does this mean the DEM data is wrong?",
"role": "user"
},
{
"message": "You could use RASTER CALCULATOR to identify cell(s) containing suspicious values. You could end up realizing that odd value(s) are n... | In DEM data there the elevation ranges from - 156 to 3877. What does this mean? | gis | 2017-05-25T16:11:26.653 |
[
{
"message": "I need to aggregate disjoint polygons within a certain distance in ArcGIS but it seems that the perfect command to do it, Aggregate Polygons, is only available with an ArcInfo that I don't have. Would you know whether there's another way to do this with another command? Below is a sample of two po... | Aggregate disjoint polygons | gis | 2017-05-25T22:02:35.053 |
[
{
"message": "I am trying to use SearchCursor to loop through a feature class and create a Euclidean Distance raster dataset for every feature in that feature class. This ED raster dataset will be used for further analysis. However, I got this error message which I cannot solve. Can anyone explain or help pleas... | Arcpy - Loop through a feature class and create Euclidean Distance for every feature | gis | 2017-05-26T04:51:38.317 |
[
{
"message": "I have a polygon layer with generated triangles covering for example district or city area. I need to select all the triangles if any triangle (object) segment is longer than 100 meters. Picture: selected triangles has a that segment (or many segments)<a href=\"https://i.stack.imgur.com/WSkMk.png\... | QGIS object selecting if any segment length is longer than | gis | 2017-05-26T06:06:22.780 |
[
{
"message": "Is there a QGIS function or plugin to draw wiggly line? I have used Spline Tool to manually draw some waves, but it is time consuming. If possible, I would like to draw something like:<a href=\"https://i.stack.imgur.com/PTHDX.png\" rel=\"noreferrer\">Inkscape <code>Function Plotter</code> ( <code>... | Drawing wavy, wiggly lines in QGIS? | gis | 2017-05-26T10:57:20.343 |
[
{
"message": "I want to project data of China. I'm not concerned with trying to preserve areal or directional relationships but preserving distances would be nice.Does such a coordinate system exist?",
"role": "user"
},
{
"message": "I would recommend an Azimuthal Equidistant projection for what you... | Which projected coordinate system for whole China? | gis | 2017-05-26T11:43:35.910 |
[
{
"message": "On same server there are 3 Tomcats and each Tomcat has a geoserver application running on it. For some reason 2 geoservers pickup MrSID and other extensions while 1 goeserver does not. Where should I look in the configurations to enable MrSID and other extensions. All geoservers have same .jars in... | How enable MrSID in Geoserver 2.9.2 [Oracle Linux Server] | gis | 2017-05-26T12:03:48.747 |
[
{
"message": "I am trying to overlay point data with polygons in R in order to find the polygons which intersect with the points provided. The assciated prj file from the polygons shows their coordinate reference system: \"DATUM[\"D_ETRS_1989\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]]\".The file is avai... | Overlaying re-projected points and polygons in R? | gis | 2017-05-26T14:39:01.633 |
[
{
"message": "I am trying to overlay point data with polygons in R in order to find the polygons which intersect with the points provided. The assciated prj file from the polygons shows their coordinate reference system: \"DATUM[\"D_ETRS_1989\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]]\".The file is avai... | Overlaying re-projected points and polygons in R? | gis | 2017-05-26T14:39:01.633 |
[
{
"message": "I have a set of GeoTIFF having <code>photometric = palette</code>, I need to convert it to a <code>greyscale</code> image without losing associated data values.I need to do using <code>Python</code> or <code>ArcGIS</code>.Changing the color could be done by setting the <code>tiff</code> <code>tag<... | Change GeoTIFF photometric | gis | 2017-05-26T15:47:32.583 |
[
{
"message": "I have a set of GeoTIFF having <code>photometric = palette</code>, I need to convert it to a <code>greyscale</code> image without losing associated data values.I need to do using <code>Python</code> or <code>ArcGIS</code>.Changing the color could be done by setting the <code>tiff</code> <code>tag<... | Change GeoTIFF photometric | gis | 2017-05-26T15:47:32.583 |
[
{
"message": "I've generated a number of plots using the <code>geom_hex</code> and <code>stat_summary_hex</code> functions in <code>ggplot2</code>, and I've adjusted the number of bins until the plot \"looked right.\" That said, I'd like to know the area each bin represents to help interpret the plot. Below is ... | How to measure the area of a hexagonal bin generated using ggplot2? | gis | 2017-05-26T23:16:17.660 |
[
{
"message": "i've got some problems with QGIS and I do need your help..I've got 2 point layers. Layer 1: 1700 points, Layer 2: 1704 Points.. Both are ESRI-Shapefiles1700 Points are identical. only 4 points are different (different coordinates).Now I want to compare both Layers and create a new layer from the r... | QGIS compare two point layers | gis | 2017-05-27T13:49:40.073 |
[
{
"message": "I want to calculate the NQPD value (Network Quantity Penalized of Distance) by my hand, and then compare it with snda calculated. But I found that I can't the value same as what sdna calculated. My case is as the following: <a href=\"https://i.stack.imgur.com/qGET6.jpg\" rel=\"nofollow noreferrer\... | Why my calculated NQPD value is different than sDNA calucated? | gis | 2017-05-28T06:22:30.723 |
[
{
"message": "I have point layer in ArcGIS 10.4 with attribute EPSG codes. I want to iterate feature selection with EPSG code, and value with EPSG code use like output coordinate system to function define projection, but there is no possible connect value to output coordinate system value. Maybe it is possible ... | Importing atribute value to output coordinate system in ModelBuilder? | gis | 2017-05-28T14:19:35.667 |
[
{
"message": "i have a tif file which I polygonized using gdal.Polygonize() method. As a result I got a vector layer with millions of polygons and values from 1 to 255 in the attribute table. Although I don't mind such huge number of polygons I would like to merge those which have the same values in the attribu... | Is there a way to merge polygons with the same values in a layer created from gdal.Polygonize()? | gis | 2017-05-29T09:11:29.327 |
[
{
"message": "I have a point data set containing crop type and a polygon data set regarding land parcels. I want to assess the point data integrity and ensure there is only one point, and no more in each polygon.How do I do this? I am using ArcGIS.",
"role": "user"
},
{
"message": "If you are using ... | 1 to 1 spatial join | gis | 2017-05-29T14:35:47.607 |
[
{
"message": "I have a vector layer of power lines for an area, the shapefile that I was given is actually around 20m to the west of where I know the power lines are actually supposed to be, as they are supposed to coincide with the main road and they do not. Is there an easy way to move this vector layer sligh... | Moving a vector layer 20m to the west on QGIS | gis | 2017-05-29T17:09:31.110 |
[
{
"message": "I am trying to display a network in QGIS. I have network line coordinates in a <code>.csv</code> file, stored in 4 columns: <code>From_X</code>, <code>From_Y</code>, <code>To_X</code>, <code>To_Y</code>.I would like to import this file into QGIS but the option <code>Layer> Add Layer from a Deli... | CSV format for a Transport Network | gis | 2017-05-29T23:09:05.310 |
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