I'm attempting to calculate the proportion of landcover classes for each county in Oregon in GEE and export values as a CSV, but I get the following error: Error: Error in map(ID=00000000000000000000): Dictionary.set: Parameter 'value' is required. (Error code: 3)
. I see this question was asked before, but not answered. Can someone help me address this error?
Here is my Code.
snippet of the code:
//calculate area of each class for each county in the shapefile
var calculateClassArea = function(feature) {
var areaImage = ee.Image.pixelArea().addBands(ORlandcover);
var areas = areaImage.reduceRegion({
reducer: ee.Reducer.sum().group({
groupField: 1,
groupName: 'class',
}),
geometry: feature.geometry(),
scale: 30,
maxPixels: 10364007075
});
var classAreas = ee.List(areas.get('groups'));
var classAreasLists = classAreas.map(function(item) {
var areaDict = ee.Dictionary(item);
var classNumber = ee.Number(
areaDict.get('class')).format();
var area2 = ee.Number(
areaDict.get('sum')).divide(1e6).round();
return ee.List([classNumber, area2]);
});
var result = ee.Dictionary(classAreasLists.flatten());
var county = feature.get('Name');
return ee.Feature(
feature.geometry(),
result.set('county', county));
};
var countyAreas = table.map(calculateClassArea);
//print(countyAreas);
var classes = ee.List.sequence(1, 16);
var outputFields = ee.List(
['county']).cat(classes).getInfo();
Export.table.toDrive({
collection: countyAreas,
description: 'class_area_by_county',
folder: 'GEO Stuff',
fileNamePrefix: 'class_area_by_county',
fileFormat: 'CSV',
selectors: outputFields
})