[20241025_v01.0] Small surprises in structure of shapefiles

[ezwelty]

• Glacier ID column is named glacier_id in glims_points.shp but glac_id in glims_polygons.shp.
• G282007E00013N appears in both north and south glims_points.shp and glims_polygons.shp. This is perhaps a feature, since (only) the outlines of this glacier straddle the equator, but it results in duplication if the files are naively concatenated together. Perhaps it should only be in the north files (based on the id/point coordinate) to prevent this.
• G288593E36819S, G288779E36663S, G288809E36641S in south glims_points.shp have longitudes outside of the [-180, 180) range (e.g. 288.593 but should be -71.407).