Shape as background map not drawing if initially zoomed in.

[jipclaassens]

If a shape background layer is configured via

unit<dpoint> AfricanACEA: Format = "ESRI:102022", DialogData = "SourceData/ReadSpatialData/Africa_countries_AEA/inFile/ISO";

And you open a layer that is only a part of the total background map, zooming out won't show the entire background layer.

OVSRV6:
C:\ProjDir\Jip\_Github_issues\geodms_africa_cusa2_issueGH110\cfg\Africa.dms
(was: C:\ProjDir\Jip\geodms_africa_cusa2_issue110\cfg\Africa.dms)

To see only a part:
/SourceData/Roads/Read_src_shps/Algeria/inFile/geometry_bp

And this one shows the whole background map:
/SourceData/ReadSpatialData/Corridors/inFile/geometry

[MaartenHilferink]

C:\ProjDir\Jip\geodms_africa_cusa2_issueGH110\cfg\Africa.dms

[MaartenHilferink]

/SourceData/Roads/Read_src_shps/Algeria/inFile/geometry_bp:

GDAL Error: SpatialReferenceSystem that GDAL obtained from Dataset differs from baseProjectionUnit's SpatialReference.
Dataset's SpatialReference:
GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AXIS["Latitude",NORTH],AXIS["Longitude",EAST],AUTHORITY["EPSG","4326"]]
baseProjectionUnit's SpatialReference:
GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433],AXIS["Longitude",EAST],AXIS["Latitude",NORTH]]
/SourceData/Roads/Read_src_shps/Algeria/inFile 

[MaartenHilferink]

@eoudejans : Do you know how to mitigate the differences between these two SpatialReferences ?

[eoudejans]

@MaartenHilferink assuming both projections are valid, I would use proj to reproject data from one definition to the other. Furthermore, the former seems more explicit in the EPSG codes that define for instance the prime meridian ie. PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]]
vs
PRIMEM["Greenwich",0]

[jipclaassens]

As if it was designed this way.

[jipclaassens]

WorldClipRect of LayerSet is by design determined by only the non-topographic (aka background) layers. While drawing, all objects of the layers are clipped by the drawing clip region intersected with the clip region of the layerset. This intersecting is useful for the case that the intersection is empty, which implies that the layerset drawing can be skipped, but not useful for filtering features.
TODO as mitigation measure: use GraphicObject boundaries to test if drawing can be skipped, but do not use it to filter features.

[MaartenHilferink]