id summary reporter owner description type status priority milestone component version resolution keywords cc cpu platform 2893 Specify crs when exporting to GeoJSON pmav99 grass-dev@… "If the information is available, `v.out.ogr` should probably specify the ""crs"" attribute when exporting to GeoJSON. `ogr2ogr` seems to support this feature. {{{ $ pacman -Qs gdal local/gdal 2.0.1-6 A translator library for raster geospatial data formats }}} A `GeoJSON` file with no `crs`: {{{ $ cat sample.json { ""type"": ""Polygon"", ""coordinates"": [ [ [ -84.32281494140625, 34.9895035675793 ], [ -84.29122924804688, 35.21981940793435 ], [ -84.24041748046875, 35.25459097465022 ], [ -84.32281494140625, 34.9895035675793 ] ] ] } }}} Reprojecting: {{{ $ ogr2ogr -f GeoJSON -t_srs ""EPSG:3857"" 3857.json sample.json $ ogr2ogr -f GeoJSON -t_srs ""EPSG:4326"" 4326.json sample.json }}} The new files: {{{ $ cat 3857.json { ""type"": ""FeatureCollection"", ""crs"": { ""type"": ""name"", ""properties"": { ""name"": ""urn:ogc:def:crs:EPSG::3857"" } }, ""features"": [ { ""type"": ""Feature"", ""properties"": { }, ""geometry"": { ""type"": ""Polygon"", ""coordinates"": [ [ [ -9386772.821532785892487, 4162454.812297557480633 ], [ -9383256.718231666833162, 4193793.993894479703158 ], [ -9377600.378138564527035, 4198533.089648159220815 ], [ -9386772.821532785892487, 4162454.812297557480633 ] ] ] } } ] } }}} {{{ $ cat 4326.json { ""type"": ""FeatureCollection"", ""crs"": { ""type"": ""name"", ""properties"": { ""name"": ""urn:ogc:def:crs:OGC:1.3:CRS84"" } }, ""features"": [ { ""type"": ""Feature"", ""properties"": { }, ""geometry"": { ""type"": ""Polygon"", ""coordinates"": [ [ [ -84.32281494140625, 34.989503567579298 ], [ -84.291229248046875, 35.219819407934352 ], [ -84.24041748046875, 35.25459097465022 ], [ -84.32281494140625, 34.989503567579298 ] ] ] } } ] } }}} By the way, when crs is not defined `ogrinfo` seems to default to `EPSG:4326` which I guess is the most reasonable choice, although I think I would prefer something more explicit (e.g. a warning): {{{ $ ogrinfo -so -al sample.json ERROR 4: GeoJSON Driver doesn't support update. Had to open data source read-only. INFO: Open of `sample.json' using driver `GeoJSON' successful. Layer name: OGRGeoJSON Geometry: Polygon Feature Count: 1 Extent: (-84.322815, 34.989504) - (-84.240417, 35.254591) Layer SRS WKT: GEOGCS[""WGS 84"", DATUM[""WGS_1984"", SPHEROID[""WGS 84"",6378137,298.257223563, AUTHORITY[""EPSG"",""7030""]], AUTHORITY[""EPSG"",""6326""]], PRIMEM[""Greenwich"",0, AUTHORITY[""EPSG"",""8901""]], UNIT[""degree"",0.0174532925199433, AUTHORITY[""EPSG"",""9122""]], AUTHORITY[""EPSG"",""4326""]] }}}" defect closed normal 7.0.5 Default unspecified invalid v.out.ogr Unspecified Unspecified