Update README.md

README.md

@@ -30,6 +30,7 @@ size_categories:
 | centre_lon      | float  | Centre of the of the grid_cell  longitude                                   |
 | utm_footprint   | string | Polygon footprint (image UTM) of the grid_cell                              |
 | geometry        | geometry | Polygon footprint (WGS84) of the grid_cell                                |
+| geotransform        | array | geotransform of the footprint                                |
 
 
 ## Example Use