IssueTracker

I was working with another dataset describing geometries that we saved in our organisation project. This description of the world is way to specific for our use case so I wanted to simplify it. My issue is that there is no way to preserve the topology of my initial feature collection when I perform the simplification.

I created an example here using FAO GAUL: https://code.earthengine.google.com/e9e79b76ca11d942c6202c1c0e3b8a7c

var regions = (
  ee.FeatureCollection("FAO/GAUL/2015/level1")
  .filter(ee.Filter.eq("ADM0_NAME", "France"))
)
print(regions.limit(5))
print(regions.size())
Map.centerObject(regions.geometry())
Map.addLayer(regions, {color: "red"}, "original regions")

// simplify drastically (around 1°)
var simplified_regions = regions.map(function(f){
  return ee.Feature(f).simplify(110000)
})
Map.addLayer(simplified_regions, {color: "green"}, "simplified regions")

It's very much related to this issue I found about the same problem in geopandas described in this SE post

It seems shapely is working on some solution based on the latest GEOS version:

The only solution at the moment is to extract the featurecollection from GEE transform it into a topology via topojson and then push it back to GEE. depending on the complexity of the geometry and the number of element the interactive exchange might not be possible which forces me to use temporary files, transfer data to shapefile (with all the funky data issues already mentioned in many of my posts) and wait fot the ingestion task to finish. TBH it's not production acceptable.

Ould it be possible to code a simplyfyCoverage method within the FeatureCollection object so we can perform this operation without exiting GEE ?