globalmapper.MapCatalogCreate ============================= .. currentmodule:: globalmapper .. py:function:: MapCatalogCreate (str aDescription, GM_Projection_t aProj) -> GM_LayerHandle_t32 Creates a new map catalog layer with the given description and native projection. Once you have created a new map catalog, use the handle returned in calls to :doc:`MapCatalogAddFile` or :doc:`MapCatalogAddLayer` to add new maps to the catalog. Use :doc:`MapCatalogSave` to save the map catalog to a disk file that can later be loaded using any of the LoadLayer* functions. :param str aDescription: Description to use for layer (can be None to use default) :param GM_Projection_t aProj: Native projection of new layer (use None for Geographic/WGS84/Arc Degrees) :returns: Handle to the map catalogue layer :rtype: GM_LayerHandle_t32