Get remote sensing indices as the project. Returns as a MapboxImage object, for integration with
the Mapbox API. Includes the URL to the image and the coordinates of the bounding box.
You can provide a start_date and end_date in ISO format (yyyy-mm-dd) to aggregate the index over a date range.
If a start_date is supplied, the index will be aggregated over the specified date range.
If no start_date is supplied, it will return the most recent image.