[Enhancement] automatically re-project GeoDataFrame to EPSG:4326 (#1350)

* automatically reproject to 4326 Signed-off-by: Martin Fleischmann <martin@martinfleischmann.net> * readme Signed-off-by: Martin Fleischmann <martin@martinfleischmann.net>
keplergl · Dec 8, 2020 · be61b70 · be61b70
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diff --git a/bindings/kepler.gl-jupyter/keplergl/keplergl.py b/bindings/kepler.gl-jupyter/keplergl/keplergl.py
@@ -29,6 +29,9 @@ def _gdf_to_dict(gdf):
     Returns:
     - dictionary: a dictionary variable that can be used in Kepler.gl
     '''
+    # reproject to 4326 if needed
+    if gdf.crs and not gdf.crs == 4326:
+        gdf = gdf.to_crs(4326)
 
     # get name of the geometry column
     # will cause error if data frame has no geometry column

diff --git a/docs/keplergl-jupyter/README.md b/docs/keplergl-jupyter/README.md
@@ -212,7 +212,7 @@ w1.add_data(data=df, name='cities')
 ```
 
 ### `GeoDataFrame`
-kepler.gl accepts [geopandas.GeoDataFrame][geo_data_frame], it automatically converts the current `geometry` column from shapely to wkt string.
+kepler.gl accepts [geopandas.GeoDataFrame][geo_data_frame], it automatically converts the current `geometry` column from shapely to wkt string and re-projects geometries to latitude and longitude (EPSG:4326) if the active `geometry` column is in a different projection.
 ```python
 url = 'http://eric.clst.org/assets/wiki/uploads/Stuff/gz_2010_us_040_00_500k.json'
 country_gdf = geopandas.read_file(url)