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": "So I am trying to use the r.denoise add on in GRASS 7.2.1 to remove noise from a .dem elevation model.Initially when running the add on I received the error:<pre><code>ERROR: mdenoise required. Follow instructions in html manual page to install it (g.manual r.denoise).</code></pre>So I downloaded ... | GRASS 7.2.1 r.denoise/mdenoise error Windows 10 | gis | 2017-09-29T10:50:39.730 |
[
{
"message": "Background:I have a set of fine resolution rasters for the Florida peninsula. These rasters are going to be used in species distribution modeling. Many of these rasters represent variables that are clearly going to be related, so prior to using them in the model I'm performing a global PCA to gene... | Accounting for spatial autocorrelation in rasters | gis | 2017-09-29T13:58:03.467 |
[
{
"message": "I have a set of 1200 historical aerial photos covering North Carolina outer banks area from 1974, 1984 and 1992. I need to georeference them and produce seamless color balanced dataset that will be utilized for compilation of NC outer banks atlas. Except for scale information, flight number and da... | Performing aerial triangulation on scanned aerial photos without having surveyed ground control points (GCPs)? | gis | 2017-09-29T17:40:08.590 |
[
{
"message": "I have a problem with processing plugin of QGIS 2.13 and in particular with its Modeler. When I have tried an operation, this is the log error:<pre><code>*An error has occurred while executing Python code: AttributeError: 'NoneType' object has no attribute 'getCopy' Traceback (most recent call las... | Fix Processing AttributeError: 'NoneType' object has no attribute 'getCopy' | gis | 2017-09-29T19:28:52.783 |
[
{
"message": "I have a vector layer for stream network created by r.stream.extract and then vectorized stream file using r.to.vect of grass algorithm in qgis.I want to find nearest point for a given point on stream network, what steps should i follow to find nearest point on stream network for this point??Exam... | Find the nearest point on a stream network from a given point? | gis | 2017-09-30T13:03:08.627 |
[
{
"message": "I have a POINT shapefile (Rain gauges) and a 100m DTM in the same coordinate system.Is there a method using QGis to calculate the difference in elevation between the elevation of each rain gauge point and the surrounding maximum height along the 8 cardinal directions (maximum distance from Rain Ga... | How to calculate difference in elevation between a POINT and the surrounding cardinal directions? | gis | 2017-10-01T16:03:24.177 |
[
{
"message": "I have a JPG file with a map which isn't in a real scale, and can't be represented by real geographical latitude and longitude, so I so the Leaflet CRS solution and this seems like the way to go.The problem is that the map file (JPG) size is ~30MB and can't be loaded in a single request, so I read... | Leaflet with custom map (CRS) - how to convert JPG to TileLayer tiles | gis | 2017-10-02T11:06:24.483 |
[
{
"message": "As I can read in many posts, it is necessary to convert Sentinel 2 L1C pixel values from Digital Count to TOA reflectance by dividing with the scaling factor.However when I open my image in SNAP, the values seem to already be in TOA reflectance, or at least between 0-1. I have added my screenshot,... | Pixel value of Sentinel 2A L1C download | gis | 2017-10-02T15:05:49.723 |
[
{
"message": "Using QGIS (2.14) is it possible on the data form for an attribute to have a colour (or other formatting) based on its value? For example if my data has a field 'quality' which has a value 'good' or 'medium' or 'bad'. I'd like the field in the attribute form to show up green/orange/red depending o... | Colouring attribute/field on QGIS data form based on value? | gis | 2017-10-02T15:25:02.190 |
[
{
"message": "I have added a points layer in which I have to put different SVG icons, according to the column level.So far so good, the separation is according to the level using a default symbol, but I want to change this default symbol to be an SVG symbol.<pre><code>my_rules = ( ('INICIAL','regexp_match(\"NIV... | How to put an SVG symbol in my rules-based symbology? | gis | 2017-10-02T20:30:30.223 |
[
{
"message": "I have the following use case:A company needs to make winter service at a set of addresses in a city. To be as fast as possible covering all addresses an efficient route calculation is required. However, it shouldn't be one single route between all addresses but a set of routes depending on the nu... | Efficient route planning between a set of points and with a set of people | gis | 2017-10-03T01:07:50.307 |
[
{
"message": "I am using qgis 2.14.17 with ubuntu16. Having as input data a DEM of the region and a river network.In the manual of qgis they suggest to use a toll of qgis: Catchment area (Parallel); I dont have this in my toolbox, anybody made the same experience and could tell me the reason for it and how to g... | How to delineate watersheds in QGIS? | gis | 2017-10-03T14:59:14.113 |
[
{
"message": "I am attempting to construct a tilelayer link from a local geoserver. the layer is called county and I seem to have set it up correctly to be called as a tilelayer<a href=\"https://i.stack.imgur.com/mRddq.png\" rel=\"nofollow noreferrer\">now as I am following the leaflet documentation <a href=\"h... | leaflet tilelayer from localhost geoserver | gis | 2017-10-03T19:28:46.093 |
[
{
"message": "I stored the styles of my layers in my pgsql database, and there is a need to change the style of a feature if a certain field is updated. I'm wondering if there's a possibility to set the attributes of the layer_styles table with an SQL query",
"role": "user"
},
{
"message": "Of co... | Change layer style in database | gis | 2017-10-04T09:53:03.690 |
[
{
"message": "I need to convert a .xls file to a point shapefile. The Excel file contains points in Lat, Lon with many attribute fields. I wrote this script to convert from .xls to .dbf and then to shapefile but it creates a .dbf of strings instead of numbers. How can I fix this?<a href=\"https://i.stack.imgur.... | Arcpy: import xls to point shapefile | gis | 2017-10-04T15:43:54.627 |
[
{
"message": "i will use a OpenLayers example in EPSG:4326, but the value of longitude is not wrapping on 180/-180 longitude. How can i fix it?<br>My first problem is, i can't pick the values of latitude and longitude in a value for a if calculation. <pre><code>if (lon > 180) { lon = (((lon / 180) - Math.... | ol.control.MousePosition EPSG:4326 over 180/-180 longitude (OL4) | gis | 2017-10-04T18:25:14.510 |
[
{
"message": "I have a geoprocessing service to create various tasks. So the paarmeters for JTXSteps.ExecuteGPTool are here /addjobcomment <code>/url:\"https://xyz/arcgis/rest/services/F2F_Workflow/Task/GPServer/CreateTask/submitJob?job_type_name=drafting&job_name=[JOB:NAME]&description=&owned_by=[J... | How to pass special characters to geoprocessing tool? | gis | 2017-10-04T18:54:19.090 |
[
{
"message": "I have searched Landsat TM images (path/row 149/37) for the year 2005 (1st Jan to 31 December 2005) on Glovis, Earth Explorer, Landsat Look and University of Maryland archive to work with. However, no scenes are available for the given period. Even no preceding and proceeding year's scenes are ava... | Missing Landsat TM scenes for the year 2005? | gis | 2017-10-05T08:16:23.853 |
[
{
"message": "I have searched Landsat TM images (path/row 149/37) for the year 2005 (1st Jan to 31 December 2005) on Glovis, Earth Explorer, Landsat Look and University of Maryland archive to work with. However, no scenes are available for the given period. Even no preceding and proceeding year's scenes are ava... | Missing Landsat TM scenes for the year 2005? | gis | 2017-10-05T08:16:23.853 |
[
{
"message": "ContextI am currently working on the migration from ArcMap 10.3 to ArcGIS Pro. We have several tools that won't work anymore in ArcGIS Pro and I am checking what native solutions could be used before going to a customized development.One of the tool we currently have generates a html page when cli... | Can I query several layers with arcpy? | gis | 2017-10-05T08:38:46.640 |
[
{
"message": "I have a shapefile that is being used as an input into the start of a model. The model is very simple but makes up a much larger model. The input is reprojected in the first step but is not needed ever again. Is there a way I can simply delete that shapefile permanently from my computer within the... | Deleting input shapefile after being used in QGIS modeler | gis | 2017-10-05T12:16:17.303 |
[
{
"message": "I'm trying to render images of a dome lit from multiple angles in GRASS using the m.nviz.image render plugin.Whilst the DEM displays nicely in the map display, I'm getting weird fractal patterns present on the rendered image (see shot)<a href=\"https://i.stack.imgur.com/ibn8U.jpg\" rel=\"nofollow ... | GRASS m.nviz.image render artifacts | gis | 2017-10-06T12:27:38.157 |
[
{
"message": "I am currently working on some line string data that are very close by and have the same Start and endpoints for the most part. I want to create midpoints or average centroids that will tell me how many of those are grouped up close by. Using mainly SQL queries i have been able to confirm that the... | Counting polygons intersecting with each others in the same Vector layers | gis | 2017-10-06T13:56:16.737 |
[
{
"message": "I have read the following two posts related to my question; however, my problem is slightly different and I'm having a hard time solving it. <a href=\"https://gis.stackexchange.com/questions/90055\">Finding if two polygons Intersect in python?<a href=\"https://gis.stackexchange.com/questions/19049... | Detecting overlapping blobs in image? | gis | 2017-10-07T08:54:10.373 |
[
{
"message": "I'm using <a href=\"http://openlayers.org/en/latest/apidoc/ol.source.TileWMS.html#getGetFeatureInfoUrl\" rel=\"nofollow noreferrer\">getGetFeatureInfoUrl to retrieve features from a WMS layer like that:<pre><code>var url = wmsSource.getGetFeatureInfoUrl( evt.coordinate, viewResolution, 'EPSG:3857... | getGetFeatureInfoUrl Hit-detection tolerance | gis | 2017-10-07T16:10:38.980 |
[
{
"message": "I am fairly new to pyQGIS plugin development.In my \"goodNeighbor_dialog_base.ui\" file I have two comboBoxes 1 and 2.When my plugin loads, I am successfully able to load all layers in comboBox1 by calling a custom function. I have another function getcolumns(self) that should populate comboBox2 w... | Cannot Call Function in pyqgis | gis | 2017-10-08T15:51:41.173 |
[
{
"message": "I have python 2.7 x64 bit and I have ARCGIS 10.5 x32 bit on windows 10.I try to build standalone arcpy scripts but I take all time : <pre><code>ImportError: DLL load failed: % is not a valid Win32 application.</code></pre>where I want to import arcpy.that error is because I have python 64 bit and ... | arcpy DLL load failed in standalone script | gis | 2017-10-08T21:15:05.720 |
[
{
"message": "I am an Archaeologist. I am interested in settlement dispersal and land use strategies in late antiquity and early middle ages.Therefore, I want to analyze a certain terrain by:- least cost polygons or- terrain accessibility by time from a certain point.I am using QGIS 2.18.6 ASTER DEM 30m (tiff).... | QGIS: Terrain accessibilty in hours/days usind DEM/CSV data | gis | 2017-10-09T08:31:27.320 |
[
{
"message": "The default format for export format for ArcGIS 10.1 is DWG_2010. Is there any way to change it to another format? In my case I need it to DXF_2000.The only known way to export to cad for me is right click on the geodatabase -> data -> export to cad.",
"role": "user"
},
{
"message": "F... | Default output file type when exporting to CAD | gis | 2017-10-09T11:46:03.783 |
[
{
"message": "I downloaded the LeafletSlider repo <a href=\"https://github.com/dwilhelm89/LeafletSlider\" rel=\"nofollow noreferrer\">https://github.com/dwilhelm89/LeafletSlider to test it out and then modify it to my needs, but when I open the index.html it doesn't have the slider as shown in the demo and the ... | LeafletSlider plugin doesn't work | gis | 2017-10-09T15:42:31.140 |
[
{
"message": "I am trying to make a kernel density plot of a points shapefile like so:<pre><code>library(rgdal)library(spatstat)library(maptools)points <- readOGR(dsn = \"C:\\\\Documents\", layer = \"points\")points$X <- coordinates(points)[,1]points$Y <- coordinates(points)[,2]aoi &... | Kernel Density Map points rejected as outside window | gis | 2017-10-09T15:43:55.300 |
[
{
"message": "I recently changed my OS to Xubuntu 16.04.Now i try to install GDAL to use it via shell and QGIS.I followed the steps from the official UbuntuGIS website (<a href=\"https://launchpad.net/~ubuntugis/+archive/ubuntu/ppa\" rel=\"nofollow noreferrer\">https://launchpad.net/~ubuntugis/+archive/ubuntu/p... | Can not install packages from UbuntuGIS | gis | 2017-10-09T18:43:27.540 |
[
{
"message": "I am hoping to get some ideas about useful ways to simplify adding vector layers with common attributes, particularly for non-GIS users (i am a borderline non-GIS user) in QGIS Las Palmas. Generally speaking the group that I deal with know how to add vector layers and draw up polygons of sample si... | QGIS common Attributes - automating "add Vector Layer" | gis | 2017-10-10T09:13:51.967 |
[
{
"message": "Could the Qgis2threejs plugin have a mouse / touch helper window added to the output display?Saw this <a href=\"https://i.imgur.com/OEY7nDb.png\" rel=\"nofollow noreferrer\">one on a Cesium display and thinking a similar helper on Qgis2threejs would make the tool more user friendly for non-GIS peo... | Adding a mouse / touch helper to Qgis2threejs plugin | gis | 2017-10-10T14:35:08.260 |
[
{
"message": "I am puzzled on why I get different outcomes on trying to calculate the area (m2) for multiple polygons in QGIS.My polygons consist of tiny objects of few cm extent.When using <code>$area</code> (field calculator / geometry) for the smallest polygons I get 0.0000 while saga tool gives a value. It ... | Why the outcome of $area (geometry), is different from area saga shape indices tool in QGIS? | gis | 2017-10-10T15:25:54.060 |
[
{
"message": "I am initiating python with little knowledge on the theme.Recently, I have been trying to manipulate a data-point Shapefile. Each point has attributes as date acquired and remote sensor applied. Now I have to filter this data according to these two attributes, but I am having real trouble.I have b... | How to create new attribute on a Shapefile based on a preexisting attribute with Fiona library in PYTHON | gis | 2017-10-10T18:58:24.377 |
[
{
"message": "I am working in Ubuntu Xenial with R v 3.2.3. I am trying to updated to the last version of R since I need to install the rgdal package to work with raster data in RStudio but I can't manage. I have tried already those options. After completing all the steps I runn R --version in terminal and it k... | Update R in Ubuntu xenial | gis | 2017-10-11T08:24:15.057 |
[
{
"message": "I have a *.csv file that have a specific field that contain array coordinates representing a route. This is a example:<pre><code>[(39.72412, -104.9995), (39.72412, -105.00091), (39.72417, -105.00157), (39.72422, -105.00159)]</code></pre>How can I create with Python a polyline shapefile by this arr... | Python create polyline shape by array coordinate point | gis | 2017-10-11T12:42:27.117 |
[
{
"message": "I am trying to update the SSL cipher suites (to be in compliance with my org security requirements) at '/portal/portaladmin/security/sslCertificates/update'according to <a href=\"http://server.arcgis.com/en/portal/latest/administer/windows/restrict-portal-for-arcgis-ssl-protocols-and-cipher-suites... | Setting SSL Cipher Suites in Portal Admin | gis | 2017-10-11T16:10:44.297 |
[
{
"message": "Similar to <a href=\"https://gis.stackexchange.com/questions/113951/split-polyline-at-specific-distance\">this question I have a set of polylines that I need to be split by a equal distance. How do I do this with QGIS, gdal/ogr2ogr and other open source tools (on Mac)? I don't have access to ArcGI... | Split polylines at a specific distance in QGIS / ogr2ogr | gis | 2017-10-11T21:42:53.713 |
[
{
"message": "WMTS <a href=\"http://portal.opengeospatial.org/files/?artifact_id=35326\" rel=\"nofollow noreferrer\">specifies GetTile requests using HTTP POST, by simply encoding all request params in the body. Is this supported by GWC, and if so, what headers etc. do I have to set?I naively tried this:<pre><c... | GeoWebCache WMTS GetTile Request with HTTP POST KVP encoding | gis | 2017-10-12T09:59:40.263 |
[
{
"message": "I'll explain this the best I can. I have 3 fields that I need to work with in Field Calculator:Link IDDesignLengthAsBuiltLengthDesignLength is length of each line feature calculated by ArcMap. Each LinkID instance has its own specific DesignLength. However, there are ID numbers that are used multi... | Field Calculator - Calculating Sum based on Different Fields | gis | 2017-10-12T16:10:15.617 |
[
{
"message": "I am classifying Landsat TM scenes of the entire Chesapeake Bay as part of my Master's research in ArcMap 10.3. For these scenes, I am classifying the following land cover types: water, forest, agricultural, wetland, beach, and urban. Training sets have been drawn throughout the scene with water h... | Separating spectral similar training sets to improve accuracy of classified Landsat scenes in ArcMap? | gis | 2017-10-12T19:59:04.193 |
[
{
"message": "I'm working with a table that has over 180,000 records. My code searches through the table and pulls field values (meeting a SQL statement) into a list. This list is used as part of a Search by Attribute SQL statement on a feature class using the IN parameter. For example, SELECT from fc WHERE ... | Iterating through records specific number at a time using ArcPy? | gis | 2017-10-13T00:12:43.180 |
[
{
"message": "How can I use the name of the data-column in a print-collection? (e.g. to use as headline)I mean the column I choose at \"layer properties\" => Style => Graduated => column. I want to use it in legend or as headline.",
"role": "user"
},
{
"message": "The name of the column you choose t... | name of Data-column in print-collection | gis | 2017-10-13T07:09:24.183 |
[
{
"message": "I have exported a webmap created in qgis2web (QGIS 2.18.13) open layers. There is a list of attributes that I wanted to include in the popup, which are mostly related to a country's demographic and socioeconomic profile. From the image below however, you will see that the popup is pretty big, out ... | qgis2web popup editing | gis | 2017-10-13T10:21:49.117 |
[
{
"message": "I have a batch of about 50 landsat 8 geotiff scenes that I want to process in QGIS to compare them. Basically, I need to make simple band math and change color scales. Is there a way to make something equivalent to an excel macro/vba, or other repetition solution?",
"role": "user"
},
{
... | How can I repeat processing routine in QGIS, to a batch of Landsat images? | gis | 2017-10-13T17:02:25.240 |
[
{
"message": "BackgroundSpecsOpenLayers 4.4.1OSMI'm fairly new to OpenLayers and have never used vectors before (primarily because I found out that I was using OpenLayers version 1, and had to relearn everything).My application adds circles to a map relating to a position with a specific radius indicating posit... | OpenLayers adding circle feature with same vectorSource increases opacity of all | gis | 2017-10-13T17:22:24.737 |
[
{
"message": "I have a problem stitching tiles together to get a specified resolution from map bounds. Im getting the bounds from a leaflet container using openmaptyles raster as a source. Tile format : (<a href=\"http://host/styles/dark/\" rel=\"nofollow noreferrer\">http://host/styles/dark/{z}/{x}/{y}@4x.png)... | How to render a single raster image from defined extent at a specified resolution using raster tiles from openmaptiles as a source? | gis | 2017-10-13T18:20:47.190 |
[
{
"message": "I am executing an <code>IdentifyTask</code> and then using <code>dojo</code> <code>array.map</code> to create an array of <code>Features</code> to pass to an <code>InfoWindow</code>. The stripped down version of my code follows.<pre><code> var deferred = identifyTask.execute(identifyParkPa... | Need dojo array.map to wait for feature layer query to complete | gis | 2017-10-13T18:24:10.853 |
[
{
"message": "I would like to calculate the volume of material lost from a scarp like the one shown in the following image:<a href=\"https://i.stack.imgur.com/NmVa4.png\" rel=\"nofollow noreferrer\">Is there a way to do these calculations with open-source software such as GMT, QGIS and GRASS?",
"role": "use... | How to restore a scarp surface grid to calculate material loss | gis | 2017-10-14T02:53:53.853 |
[
{
"message": "I would like to display images in a marker popup but I get the following error:<a href=\"https://i.stack.imgur.com/T0iuq.png\" rel=\"nofollow noreferrer\">The image does display when I write: <pre><code>var picURL2 = 'http://www.lib.utexas.edu/maps/historical/newark_nj_1922.jpg', imageBounds = ... | Displaying images in marker popup fails | gis | 2017-10-14T23:16:44.047 |
[
{
"message": "I have a GeoJSON with some points of interest that I would like to update to the Open Street Map project.I cannot find documentation on Wiki to do so. Is it possible to import points to OSM from file?Maybe I need to convert it into another format using <code>ogr2ogr</code> but I have no idea to st... | Add Point from GeoJSON to OSM | gis | 2017-10-15T10:15:33.643 |
[
{
"message": "I have a problem with attribute table which I'd like to learn to solve without MS Excel.The Shapefile I have, has an attribute field, which consists of 3 parts, separated by \";\" -sign. Here is an example of what the original looks like, how it is split and how the final attribute should look lik... | ArcMap Python script for attribute split, replace and concatenate | gis | 2017-10-16T09:58:09.770 |
[
{
"message": "I want to clip a line layer that I have, only within a polygon. Used Vector -> Geoprocessing Tools -> Clip, and I do get most of line I want that is EXACTLY within the polygon layer. Thing is the line sometimes goes a little bit outside the polygon, but I want to include those parts of the line as... | Clip line close to polygon | gis | 2017-10-16T12:39:37.087 |
[
{
"message": "I want to label a shp layer on two lines with pyQGis.I managed to do it with only one field, but with two or more fields (using concat) it does not work anymore.Here is the code I wrote:<pre><code>def labelLine (lyr, fieldNom1, fieldNom2): # This function shows the labels of 2 fields \"fieldName1... | Multi-line labeling of a shapefile layer with pyQGis | gis | 2017-10-17T10:24:29.463 |
[
{
"message": "I have a geojson file \"test.geojson\" which contains image metadata for multiple images, including image url (as <code>browseUrl</code>) and image bounds (as <code>imageBounds</code>). What I want to do is to display a corresponding image on my leaflet map by clicking on it's shape using <a href=... | Display an image on a Leaflet map using geojson attributes | gis | 2017-10-17T14:34:04.827 |
[
{
"message": "I am using django-cities and geopy. I am trying to get city name, id and country name, id based on given latitude and longitude.Normally this is how you can get city and country using geopy.<pre><code>from geopy.geocoders import Nominatimgeolocator = Nominatim(timeout=3)geolocator.reverse('52.5094... | Get city country with different names | gis | 2017-10-18T11:06:36.013 |
[
{
"message": "I have a data for a project and the attributes had been written in Arabic and this what I found, how can I repair it and get the Arabic texts?I am using ArcGIS 10.4<a href=\"https://i.stack.imgur.com/dQB6R.png\" rel=\"nofollow noreferrer\">",
"role": "user"
},
{
"message": "I assume yo... | Attribute language error | gis | 2017-10-18T13:51:24.760 |
[
{
"message": "I'm trying to reproject an envelope from EPSG:4326 to EPSG:32632. I code down some tests and run them. They works, fine. Then I run again my tests with mvn clean test and they fails. This is weird. Here is a unit test to reproduce the issue:<pre><code>import org.geotools.geometry.jts.ReferencedEnv... | Reprojecting envelopes tests runs fine on eclipse but fails on maven | gis | 2017-10-18T14:10:32.590 |
[
{
"message": "I am trying to make Employment Distribution of map of a given area in ArcGIS. All the employment information is in this one point shapefile from Census. Different fields show different number of employment for different industries. <a href=\"https://i.stack.imgur.com/WEbED.jpg\" rel=\"nofollow nor... | How to Iterate Across Fields as Inputs for a single tool (Kernel Density) in ArcGIS ModelBuilder | gis | 2017-10-18T21:04:53.477 |
[
{
"message": "Can any one knows the error of importing GDAL?I downloaded the binaries from Gisinternalsa! to install the GDAL library. However,I cannot import gdal successfully. The detail of error is shown in the figure.ImportError: DLL load failed:The specified procedure could not be found.(figure 1)I install... | Error of installing GDAL on python with windows | gis | 2017-10-19T00:12:49.647 |
[
{
"message": "I have a netCDF file. After converting the file into a Raster layer, I extract it for my study area i.e Pakistan. After applying the extract by mask tool the extracted raster layer does not properly fit the shapefile on the boundary.The problem is highlighted in the image attached. <a href=\"https... | Extract by mask | gis | 2017-10-19T04:17:36.300 |
[
{
"message": "I have done a viewshed (ArcGIS Spatial Analyst 10.5) on a DEM raster layer, where a limited amount of observer points (5) are aiming to capture as many points as possible on this DEM surface.The idea is that the observing points won't capture all these points. But if I wanted to optimize this and ... | Determining percentage of points visible within viewshed using ArcGIS Spatial Analyst? | gis | 2017-10-19T07:34:14.333 |
[
{
"message": "I need to iterate through each of the features of a feature class successively to use each one as the mask to extract from a raster with the ExtractByMask tool. Basically I'm looking for the \"Iterate Feature Selection\" function from ModelBuilder for Python scripting.If I understand correctly, us... | Iterate through features to use selection as input for ExtractByMask | gis | 2017-10-19T11:50:51.563 |
[
{
"message": "In my journey to solve <a href=\"https://gis.stackexchange.com/questions/258900/how-to-perform-spatial-join-and-obtain-attribute-in-python-gdal\">a different question, I've decided to create a QGIS processing model to automatically correlate rasters to a projection (UTM) grid.The inputs are a rast... | How to get extent of raster in QGIS Modeler? | gis | 2017-10-19T13:37:10.067 |
[
{
"message": "When deploying ArcGIS Portal, we have the ability to add a draw widget to our map app using Web AppBuilder. However, when users draw on the map, and they try to share this markup with other users, the drawings do not show up.Is there a way for our users to markup the map using the draw widget, or... | ArcGIS Portal - Can you share map markup? | gis | 2017-10-19T13:51:15.383 |
[
{
"message": "I am doing a project where we are attempting to determine how many more buildings would flood if the FEMA flood plain increased by 1',2' and 5'. I have the elev of the flood plain rasters from lidar data, but I am having trouble figuring out how much more area will be inundated by the rises I desc... | Increasing Flood Plain | gis | 2017-10-19T13:52:31.727 |
[
{
"message": "There are 7 polygon tables in postgis. Each table has a unique column that holds a weight of 1. so each row has a 1 in it. Without converting to raster I want to \"add\" up all the vector tables into one weighted table. I am able to do this using the ArcGIS Union tool. <a href=\"https://i.stack.i... | postgis add vector tables together to create one weighted table | gis | 2017-10-19T15:23:30.050 |
[
{
"message": "I'm fairly new to working with rasters. I found out that in my area the ASTER digital elevation data has a \"bump\" artifact in it, where there's a large (non existant in real life) bump in the elevation. I downloaded the SRTM elevation data, and although lower resolution doesn't seem to have the ... | How to create new raster from only the extreme scores of another raster? (Correcting errors in ASTER elevation data) | gis | 2017-10-20T05:28:25.047 |
[
{
"message": "As you can see in the below result it is not fine.I already tried tools like Majority Filter, Focal but didn't work for me.All I want is to smooth a raster file and not having the squares too much defined.<a href=\"https://i.stack.imgur.com/HPvXa.png\" rel=\"nofollow noreferrer\">",
"role": "u... | Smoothing raster using ArcGIS Desktop? | gis | 2017-10-20T06:36:13.487 |
[
{
"message": "I'm writing a qgis plugin which needs a fixed-distance-buffer algorithm and must add the buffer result to the map layers of the software.I have the following code:<pre><code># these are my import listimport os.pathimport qgis.core# Initialize Qt resources from file resources.pyimport resourcesimpo... | Adding processing buffer output to QgsMapLayerRegistry (argument 1 has unexpected type 'dict') | gis | 2017-10-21T09:42:29.157 |
[
{
"message": "I'm trying to intersect two layers in QGIS, similar to <a href=\"https://gis.stackexchange.com/questions/249922/intersection-error-qgis-invalid-geometries-that-are-actually-valid\">this unanswered question. I've performed Vector > Geometry Tools > Check Geometry Validity and I've run GRASS's v.cle... | QGIS: "Invalid geometry" even after using validity checker and v.clean | gis | 2017-10-22T00:27:06.013 |
[
{
"message": "I have this raster wich represent some areas of observation from 3 given points following a series of rules considering elevation and direction of the slope.Basically, the white-ish color represent no point can see this area (0); the orange area is seen from 1 point (1); and the brown area is seen... | Calculating area of raster using QGIS? | gis | 2017-10-23T00:35:17.633 |
[
{
"message": "Below are the steps to find the shortest route between two points in a road network <a href=\"https://docs.qgis.org/2.18/en/docs/training_manual/vector_analysis/network_analysis.html\" rel=\"nofollow noreferrer\">https://docs.qgis.org/2.18/en/docs/training_manual/vector_analysis/network_analysis.h... | QGIS Shortest Route Network Analysis using multiple features | gis | 2017-10-23T03:05:56.940 |
[
{
"message": "I'm wondering why before clustering the global <code>Landsat-7</code> image in this <a href=\"https://developers.google.com/earth-engine/clustering\" rel=\"nofollow noreferrer\">tutorial, the authors first trained the clusterer on a subset region around Egypt?Since the Kmean algorithm is supposed ... | Why is there a need to train the clusterer in Google Earth Engine | gis | 2017-10-23T14:01:23.960 |
[
{
"message": "I am attempting to call <code>gdalwarp</code> (python binding <code>gdal.Warp()</code>) as a script inside QGIS modeler (QGIS 2.18.10, gdal 2.2.0). The goal is to correlate any loaded raster with a UTM zone grid, get the correct EPSG code from that grid, and pipe that code as a dynamic value into... | How to populate gdalwarp with a dynamic value in QGIS geoprocessing? | gis | 2017-10-23T14:14:15.930 |
[
{
"message": "I am trying to calculate a field based on the date values in another field. Here is my code from the pre-logic script code box:<pre><code>def getHalf(dfield): if dfield >= date '2017-08-27 00:00:00' AND dfield < date '2017-08-27 12:00:00': return 1</code></pre>The field calculator fail... | ArcGIS Field Calculator Not Working With Date Field | gis | 2017-10-23T15:06:32.907 |
[
{
"message": "By default, QGIS does not seem to recognize \"Value Tables\" (VAT) the way ArcGIS does. So far I cannot find a way to represent the pixel values discretely, or apply a \"legend\" to the layer. Is there something that can be done to associate the VAT with the raster in QGIS? Ultimately I'd like to... | How to read a raster value table (VAT) in QGIS? | gis | 2017-10-23T18:07:50.730 |
[
{
"message": "I have, I believe, successfully loaded a raster into my PG DB. I see the table in PGAdmin but am unable to see it in QGIS. The table in PG has 1 row. Running, e.g. <code>st_count(rast)</code> on the table returns over 600,000. I am,Unable to view the dataset in QGISUnable to run PG raster function... | Creating a table from the result of ST_DumpValues() | gis | 2017-10-23T18:56:56.293 |
[
{
"message": "I have a shapefile 'watershd.shp' of a region of South Korea without any projections. I want to view this watershd.shp area along with a point shapefile (point.shp) which I got from Google Earth. When I define the projection of watershed.shp to UTM Zone 52N, the watershed.shp is shown somewhere be... | UTM Zone 52N belongs to Korea or Malaysia? | gis | 2017-10-24T04:52:54.613 |
[
{
"message": "I'm trying to convert between two arbitrary projected coordinate reference systems, but every proj.4 library variant that I've tried has given a results different from QGIS's cs2cs application (which matches EPSG.io's results).So, for transforming the point (572084.7402, 4542311.793) metres, the e... | proj4js, proj4.net, proj4 give different result to cs2cs | gis | 2017-10-24T07:40:30.177 |
[
{
"message": "I have square grids of about 1000 polygons and i want to export TIFF images of each grid using a Python script, am having this below Python which gives me only .tiff images without referenced<pre><code>mxd = arcpy.mapping.MapDocument(\"CURRENT\")for page_number in range(1, mxd.dataDrivenPages.pag... | Exporting .tiff georeferenced images in layout view using pyhton | gis | 2017-10-24T07:49:46.363 |
[
{
"message": "Comparing results of zonal statistics in QGIS and R, I noticed that the results they both yield do somehow differ. Manually checking, I also found that both QGIS and R seem to partly produce erroneous results. I wonder whether there is a robust solution to calculating mean values of raster cells w... | Robust Zonal stats in R and QGIS | gis | 2017-10-24T11:42:22.030 |
[
{
"message": "What i have:A csv file with coordinates (RT90)A Elevation layerWhat i want to do:In the csv I have some costs and I want the 3D cylinder to represent the costs.Higher cost=Higher cylinderProblemI have no problem rendering the cylinders but i can't control the height.How do i get the plugin to unde... | qgis2threejs height of cylinder based on column value | gis | 2017-10-24T13:42:37.850 |
[
{
"message": "I'm trying to implement a WFS client in Java using the Geotools. But everytime I tried to read the actual features I get following Error<pre><code>java.lang.ClassCastException: java.util.HashMap cannot be cast to org.opengis.feature.simple.SimpleFeature</code></pre>It seems it is nested somewhere ... | WFS geotools Hashmap can not be parsed to SimpleFeature | gis | 2017-10-24T14:43:22.230 |
[
{
"message": "I am trying to use Midvatten on QGIS 2.18.13 on a mac. When I create a new database, I get <blockquote> \"no such function: spatialite_version\" (see error message below).</blockquote>I've uninstalled and reinstalled QGIS (using Kyngchaos's packages) and Midvatten. None of that has helped. How d... | QGIS Spatialite error: No Such Function: spatialite_version | gis | 2017-10-24T16:14:13.853 |
[
{
"message": "<a href=\"https://i.stack.imgur.com/PwtfH.png\" rel=\"nofollow noreferrer\">I´m trying to create that personalized style for hidrography representation (in blue at the Picture); the lines must have 0.2 mm of edge, 3 mm of length, the space between lines must be 1.5 mm and the points, with 0.4 mm o... | Line style with alternating dots and long dashes | gis | 2017-10-24T17:04:19.500 |
[
{
"message": "I have a line vector layer with a field name of \"buffer_distance\". I want create a dissolved buffer layer based on it's field. I write below code:<pre><code>from qgis.utils import ifacefrom qgis.analysis import QgsGeometryAnalyzer mc = iface.mapCanvas() layer = mc.currentLayer()Distance_Field = ... | How to create dissolved buffer layer with pyqgis? | gis | 2017-10-24T17:52:23.723 |
[
{
"message": "I've installed GDAL2.3dev on my mac using Homebrew, expecting it to support GeoPDFs already. But when I run <code>gdalinfo</code> on a pdf file from USGS, I still get this error:ERROR 4: `WA_Sunrise_244132_1971_24000_geo.pdf' not recognized as a supported file format.What do I need to do add PDF s... | How can I enable PDF support in gdal? | gis | 2017-10-24T20:19:35.477 |
[
{
"message": "I have converted e simple polygon layer to e a topogeometry layer in postgis topology. And now I have 3 main layer, Edge_data (lines),nodes(points) and the polygons topogeometry (.topo). <a href=\"https://i.stack.imgur.com/kvwX9.jpg\" rel=\"nofollow noreferrer\">I can open these layers in Qgis and... | How to speed up topogeometry layer in postgis topology? | gis | 2017-10-24T21:30:31.260 |
[
{
"message": "I have a source polyline feature class and a target polyline feature class. Eventually, I want to replace the target feature geometry with the source feature geometry while preserving existing attributes in the target feature. In the code below, I am trying just to print values based on a conditio... | Print/obtain all vertices in fc1 if list in fc2 | gis | 2017-10-24T22:06:19.090 |
[
{
"message": "I want to delete all the internal roads which exists in Block2. These roads don't have any attribute data. It is a single polygon. I need to extract only external roads. Block 2 should be made as Block 1. Block 1 is done by removing internal roads manually using \"Cut polygon\" tool.I have so many... | How to delete roads within blocks using ArcGIS? | gis | 2017-10-25T07:39:41.300 |
[
{
"message": "I have two polygons (green and red in the image) and want to find the shared border using PostGIS. If I use <code>select st_intersection(green_geometry, red_geometry)</code>, PostGIS sometimes returns a point, not a line. I believe this is due to some rounding error that seems to occur more often ... | Find shared border | gis | 2017-10-25T10:05:25.447 |
[
{
"message": "I have a QGIS plugin which has a combobox (<a href=\"http://doc.qt.io/qt-4.8/qcombobox.html\" rel=\"nofollow noreferrer\">QComboBox) element with a list of layers currently opened in QGIS. The problem is that the layer list is only updated on initialization of the plugin (I do it with QgsMapLayerR... | Keep track of current layers in PyQt plugin for QGIS | gis | 2017-10-25T14:30:22.503 |
[
{
"message": "I am creating some type of command line tool that will take a coordinate point(X and Y) and return an attribute from a polygon (shapefile) that surrounds the coordinate. I found this<a href=\"https://gis.stackexchange.com/questions/30082/to-get-attribute-data-of-polygon-layer-by-giving-lat-lon\">... | Get attribute information from a polygon feature using command line tool | gis | 2017-10-25T16:53:43.927 |
[
{
"message": "I am using \"Iterate Row Selection\" in ModelBuilder to run through every line of a table. I am able to have the iterator create a rolling variable (Value), by selecting a field in \"Group by Fields.\" If I \"Group by Fields\" on the field <code>CNTRY_NAME</code>, the iterator creates a value for ... | Create multiple "Values" from ModelBuilder Iterator | gis | 2017-10-25T18:28:16.107 |
[
{
"message": "I'm trying to create a custom CRS with proj4. I need to displace coordinates by adding 10 meters east and 20 meters north from EPSG:32719.How can I do that with PROJ.4?",
"role": "user"
},
{
"message": "The EPSG:32719 is a UTM Zone 19 south setup with:<pre><code>$ grep -B1 '<32719&... | PROJ.4 How to create custom CRS to displace by x and y? | gis | 2017-10-25T20:06:59.673 |
[
{
"message": "I am classifying Landsat TM scenes for the entire Chesapeake Bay as part of my Master's research. Scenes have been collected from 1986 to 2016 in 5 year increments for my area of interest. I recently came across various papers that mentioned how to preprocess Landsat scenes for various analyses bu... | Is preproccessing a Landsat scene necessary for image classification? | gis | 2017-10-25T23:23:14.837 |
[
{
"message": "I have a lot of rasters which have next names structure: 2017-08-02_1011_image.tiff2017-08-13_5erf_image.tiff2017-05-02_1555_image.tiff2017-08-02_1001_image.tiff2017-08-02_1001_image.tiff2017-08-06_abc3_image.tiff2017-08-06_45ei_image.tiff2017-08-06_0005_image.tiffI want to mosaic files with same ... | Mosaic rasters with same suffix (python) | gis | 2017-10-26T10:25:21.000 |
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