Add logic to export raster files (as COG).

Raster data is not stored in the PostGIS database.  Instead, the mtime
of the target directory is used to determine whether the COG is up to
date.

Add a new flag --metadata-compress for JSON metadata compression (which
also applies to MVT metadata), and --rasterdir for the target raster
directory.

1 files changed, 4 insertions, 2 deletions

diff --git a/common_gdal.py b/common_gdal.py
index 7333f58..b91f8c5 100644
--- a/common_gdal.py
+++ b/common_gdal.py
@@ -59,7 +59,7 @@ def gdalSetOpenExArgs(option_dict : Optional[dict[str, Any]] = {},
                       flags : int = 0) -> tuple[dict[str, int|list[str]], gdal.Driver]:
     """Return a pair kwargs and driver to use with gdal.OpenEx()."""
 
-    kwargs = { 'nOpenFlags': gdal.OF_VECTOR | flags }
+    kwargs = { 'nOpenFlags': flags }
 
     fmt = option_dict.get('format', None)
     if fmt is None:
@@ -68,8 +68,10 @@ def gdalSetOpenExArgs(option_dict : Optional[dict[str, Any]] = {},
         drv = gdal.GetDriverByName(fmt)
         if drv is None:
             raise RuntimeError(f'Unknown driver name "{fmt}"')
-        if not gdalGetMetadataItem(drv, gdal.DCAP_VECTOR):
+        if flags & gdal.OF_VECTOR and not gdalGetMetadataItem(drv, gdal.DCAP_VECTOR):
             raise RuntimeError(f'Driver "{drv.ShortName}" has no vector capabilities')
+        if flags & gdal.OF_RASTER and not gdalGetMetadataItem(drv, gdal.DCAP_RASTER):
+            raise RuntimeError(f'Driver "{drv.ShortName}" has no raster capabilities')
         kwargs['allowed_drivers'] = [ drv.ShortName ]
 
     oo = option_dict.get('open-options', None)