Converting to feature to geometry for .filterBounds using Google Earth Engine JavaScript API

Question

I am trying to filter a MODIS image collection by country. I have seen a lot of examples where you can map the image collection over a function and clip to the country, but I was trying to simplify the code by filtering my image collection by the country geometry (.filterBounds) instead. I know I need to feed in a geometry to do this, so I tried to convert my country feature to a geometry, and then filter by .filterBounds. It does not return an error, but also does not filter to my country shape.

If there is not a way to get this to work, why is creating a function to clip an image better?

var canadaShape = ee.FeatureCollection('USDOS/LSIB_SIMPLE/2017').filter(ee.Filter.eq('country_na', 'Canada'));
var geometry = CanadaShape.geometry();
Map.addLayer(geometry);
var terraCollection = ee.ImageCollection("MODIS/006/MOD10A1").select(['NDSI_Snow_Cover']).filterBounds(geometry).filter(ee.Filter.date('2019-11-01', '2020-05-01')); 
Map.addLayer(terraCollection);

Answer 1

This should throw an error - you have a typo. CanadaShape.geometry() should be lowercased as in your variable declaration. Change it to var geometry = canadaShape.geometry(); and it works.

You could use a map function if you wanted to apply this across many countries, but if you only need to do one - filterBounds with a single geometry is the way to go.