Google Earth Engine 将 Raster 转换为 Vector(reduceToVectors)
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2022-05-26 19:10:20
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var geometry = ee.Geometry.Rectangle([29.1796875, 32.02670629333615, 32.607421875, 29.993002284551075]);
var landcover = ee.Image('MCD12Q1/MCD12Q1_005_2001_01_01').select('Land_Cover_Type_1');
// Run reduceToVectors per class by masking all other classes.
var classes = ee.List([0, 1, 2, 3, 4, 5, 6, 7, 8])
.map(function(n) {
var classImage = landcover.eq(ee.Number(n));
var vectors = classImage.updateMask(classImage)
.reduceToVectors({
reducer: ee.Reducer.countEvery(),
geometry: geometry,
scale: 30,
maxPixels: 1e8})
.geometry();
return ee.Feature(vectors, {"class": n});
});
var result = ee.FeatureCollection(classes);
Map.addLayer(result);
最好是每一个polygon都有一个feature
var geometry = ee.Geometry.Rectangle([29.1796875, 32.02670629333615, 32.607421875, 29.993002284551075]);
var landcover = ee.Image('MCD12Q1/MCD12Q1_005_2001_01_01').select('Land_Cover_Type_1');
var classes = landcover.reduceToVectors({
reducer: ee.Reducer.countEvery(),
geometry: geometry,
scale: 30,
maxPixels: 1e8
});
var result = ee.FeatureCollection(classes);
Map.addLayer(result);