added coords

README.md

@@ -56,6 +56,141 @@ Here are the descriptions of the 31 weather variables with their units:
 | Vapor Pressure                                               | VAP              | Pa                 |
 | Vapor Pressure Deficit                                       | VAD              | Pa                 |
 
+### Grid coordinates for the regions
+
+the indices in the dataset refer to the order of these coordinates. For instance `usa_0` refers to 
+the first rectangle of the USA in the list below.
+
+#### USA
+
+```
+((29, -109), (24, -101)),
+((29, -101), (24, -93)),
+((29, -93), (24, -85)),
+((29, -85), (24, -77)),
+((34, -125), (29, -117)),
+((34, -117), (29, -109)),
+((34, -109), (29, -101)),
+((34, -101), (29, -93)),
+((34, -93), (29, -85)),
+((34, -85), (29, -77)),
+((34, -77), (29, -69)),
+((39, -125), (34, -117)),
+((39, -117), (34, -109)),
+((39, -109), (34, -101)),
+((39, -101), (34, -93)),
+((39, -93), (34, -85)),
+((39, -85), (34, -77)),
+((39, -77), (34, -69)),
+((44, -133), (39, -125)),
+((44, -125), (39, -117)),
+((44, -117), (39, -109)),
+((44, -109), (39, -101)),
+((44, -101), (39, -93)),
+((44, -93), (39, -85)),
+((44, -85), (39, -77)),
+((44, -77), (39, -69)),
+((49, -133), (44, -125)),
+((49, -125), (44, -117)),
+((49, -117), (44, -109)),
+((49, -109), (44, -101)),
+((49, -101), (44, -93)),
+((49, -93), (44, -85)),
+((49, -85), (44, -77)),
+((49, -77), (44, -69)),
+```
+#### Central America
+```
+((29, -117), (24, -109)),
+((24, -117), (19, -109)),
+((24, -109), (19, -101)),
+((24, -101), (19, -93)),
+((24, -93), (19, -85)),
+((24, -85), (19, -77)),
+((19, -109), (14, -101)),
+((19, -101), (14, -93)),
+((19, -93), (14, -85)),
+((19, -85), (14, -77)),
+```
+
+#### South America
+```
+((-51, -77), (-56, -69)),
+((-51, -69), (-56, -61)),
+((-46, -85), (-51, -77)),
+((-46, -77), (-51, -69)),
+((-46, -69), (-51, -61)),
+((-41, -85), (-46, -77)),
+((-41, -77), (-46, -69)),
+((-41, -69), (-46, -61)),
+((-41, -61), (-46, -53)),
+((-36, -85), (-41, -77)),
+((-36, -77), (-41, -69)),
+((-36, -69), (-41, -61)),
+((-36, -61), (-41, -53)),
+((-36, -53), (-41, -45)),
+((-31, -85), (-36, -77)),
+((-31, -77), (-36, -69)),
+((-31, -69), (-36, -61)),
+((-31, -61), (-36, -53)),
+((-31, -53), (-36, -45)),
+((-26, -85), (-31, -77)),
+((-26, -77), (-31, -69)),
+((-26, -69), (-31, -61)),
+((-26, -61), (-31, -53)),
+((-26, -53), (-31, -45)),
+((-26, -45), (-31, -37)),
+((-21, -85), (-26, -77)),
+((-21, -77), (-26, -69)),
+((-21, -69), (-26, -61)),
+((-21, -61), (-26, -53)),
+((-21, -53), (-26, -45)),
+((-21, -45), (-26, -37)),
+((-21, -37), (-26, -29)),
+((-16, -85), (-21, -77)),
+((-16, -77), (-21, -69)),
+((-16, -69), (-21, -61)),
+((-16, -61), (-21, -53)),
+((-16, -53), (-21, -45)),
+((-16, -45), (-21, -37)),
+((-16, -37), (-21, -29)),
+((-11, -85), (-16, -77)),
+((-11, -77), (-16, -69)),
+((-11, -69), (-16, -61)),
+((-11, -61), (-16, -53)),
+((-11, -53), (-16, -45)),
+((-11, -45), (-16, -37)),
+((-11, -37), (-16, -29)),
+((-6, -85), (-11, -77)),
+((-6, -77), (-11, -69)),
+((-6, -69), (-11, -61)),
+((-6, -61), (-11, -53)),
+((-6, -53), (-11, -45)),
+((-6, -45), (-11, -37)),
+((-6, -37), (-11, -29)),
+((-1, -85), (-6, -77)),
+((-1, -77), (-6, -69)),
+((-1, -69), (-6, -61)),
+((-1, -61), (-6, -53)),
+((-1, -53), (-6, -45)),
+((-1, -45), (-6, -37)),
+((-1, -37), (-6, -29)),
+((4, -85), (-1, -77)),
+((4, -77), (-1, -69)),
+((4, -69), (-1, -61)),
+((4, -61), (-1, -53)),
+((4, -53), (-1, -45)),
+((4, -45), (-1, -37)),
+((9, -85), (4, -77)),
+((9, -77), (4, -69)),
+((9, -69), (4, -61)),
+((9, -61), (4, -53)),
+((9, -53), (4, -45)),
+((14, -85), (9, -77)),
+((14, -77), (9, -69)),
+((14, -69), (9, -61)),
+((14, -61), (9, -53)),
+```
 
 ## Dataset Structure