From @slibby
For geojson exports (and other formats) of large datasets, I think we may want to consider reducing decimal degree precision to reduce filesize. For complex polygon layers, the geometry section of the geojson file will take up the vast majority of the text space, and currently koop exports with 16-17 significant digits of precision:
Wikipedia shows us that 8 degrees of precision is down to 1mm of detail, which should be sufficient for most applications. Is it worth considering this when generating geojson, to save on disk and transfer overhead?
dmfenton
commented
7 years ago
From @slibby For geojson exports (and other formats) of large datasets, I think we may want to consider reducing decimal degree precision to reduce filesize. For complex polygon layers, the geometry section of the geojson file will take up the vast majority of the text space, and currently koop exports with 16-17 significant digits of precision:
"geometry": { "type": "Polygon", "coordinates": [ [ [ 85.275995105195037, 27.708265241160536 ], [ 85.273401891751973, 27.704288656786961 ], [ 85.268215466662468, 27.704288656786961 ], [ 85.265622253219405, 27.708265241160536 ], [ 85.268215466662468, 27.712241680589148 ], [ 85.273401891751973, 27.712241680589148 ], [ 85.275995105195037, 27.708265241160536 ] ] ] } }
Wikipedia shows us that 8 degrees of precision is down to 1mm of detail, which should be sufficient for most applications. Is it worth considering this when generating geojson, to save on disk and transfer overhead?