Rationale

While testing several WMS services for EOmaps I realized that there is a flaw in the logic for identifying the "native_srs" of a WMS service:

Current logic:

• native_srs = axes projection if found in hardcoded _CRS_TO_OGC_SRS dict

Problem:

• In case the axes projection is found in _CRS_TO_OGC_SRS but the service does not provide the used srs, no search for fallback-srs is attempted and adding the wms will fail even if a fallback srs would have been available

Solution:

• If the axes projection is valid, only use it if it is actually provided by the service and otherwise continue checking for fallback srs

Implications

WMS services that do not provide the currently used axes projection will now attempt to reproject from available fallback projections even if the axes projection was provided in _CRS_TO_OGC_SRS.