Looping through list of coordinates to create polygons on Google Earth Engine

Question

I have imported a CSV file with just one column. Each row of the column has multiple coordinates required to draw a polygon. (This was collected on the ground)

I have used the below code to extract the coordinates from the CSV as a list

var poly = table2.aggregate_array('wkt')  //wkt being the column name

Now essentially, I would want to loop through the list, create and display the polygons on the map.

I am looking for something like this:

var newPolygon = ee.Geometry.Polygon(poly[i])

If there is a simpler way to use the coordinates to plot polygons can you let me know?

Answer 1

Without more information on the CRS of your coordinates, and their construction., it will be difficult to create a working solution, but I'll make assumptions along the way and see if you can adapt it to your solution. What you'll want to do is map a function to your list that will take each element of the list (the polygon coordinates) and make a geometry with it. Something like this.

var makeFeatureFromGeometry = function(coords){
         var newGeometry = ee.Geometry.Polygon(coords, CRS); // you will have to supply the CRS of the coordinates
         return ee.Feature(newGeometry);
}
var myFeatureCollection = ee.FeatureCollection(poly.map(makeFeatureFromGeometry));

Map.addLayer(myFeatureCollection);

Try this and if you receive error messages, I'll see if I can help you create a working solution.