The layer Polygon_A is a vector layer consisting of numerous polygons, created from a binary raster layer with values of 0 and 1. On the other hand, Polygon_B is a vector layer created from user-defined geometrical shapes and contains only three distinct polygon shapes. When subtracting Polygon_A from Polygon_B and exporting the resulting layer as Polygon_C, an issue arises when importing it into Arcmap. Specifically, only one polygon appears in the attribute table, which requires investigation to determine the cause of this problem and how to resolve it.
Below shows necessary JavaScript code related with subtraction of A from B in Google Earth Engine (GEE).
// Define the geometry of B feature
var Polygon_B= ee.FeatureCollection(table);
var B=Polygon_B.geometry();
// Define the geometry of A feature
var A = Polygon_A.geometry();
// Erase A from B and create C
var C= A.difference(B, ee.ErrorMargin(1));
// Convert geometry to feature
var Polygon_C= ee.Feature(C);
print(Polygon_C)
// Export the polygon as a shapefile to a specific folder in Google Drive
Export.table.toDrive({
collection: ee.FeatureCollection([Polygon_C]),
description: 'Polygon_C',
folder: 'Shapefile_GEE', //My Folder name of Google Drive
fileFormat: 'SHP'
});
When you export a polygon layer from Google Earth Engine, it will only show a single row in the attribute table because the export process will collapse all of the individual polygons in the layer into a single multi-part polygon.
This is because Google Earth Engine uses a specific format for exporting polygons, known as the Well-Known Text (WKT) format, which represents multi-part polygons as a single string of text. When the exported layer is opened in a GIS software, it will be interpreted as a single multi-part polygon rather than as individual polygons.
To work with individual polygons in the exported layer, you will need to use a GIS software that supports multi-part polygons, such as QGIS. You can then use tools within the GIS software to split the multi-part polygon into individual polygons, which will result in multiple rows in the attribute table.
When you export a polygon layer from Google Earth Engine, it will only show a single row in the attribute table because the export process will collapse all of the individual polygons in the layer into a single multi-part polygon.
This is because Google Earth Engine uses a specific format for exporting polygons, known as the Well-Known Text (WKT) format, which represents multi-part polygons as a single string of text. When the exported layer is opened in a GIS software, it will be interpreted as a single multi-part polygon rather than as individual polygons.
To work with individual polygons in the exported layer, you will need to use a GIS software that supports multi-part polygons, such as QGIS. You can then use tools within the GIS software to split the multi-part polygon into individual polygons, which will result in multiple rows in the attribute table.
I am grateful for the advice you gave me, Harish Dangi. It helped me to feel more confident and capable
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