Add bounded GRB map acquisition
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@@ -607,6 +607,16 @@ browser never contacts WCS directly. An exact repeat reuses the persisted
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request. A complete-Flanders raster request remains disabled by the regional
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size guard, while a complete municipality remains a valid bounded analysis.
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The same explicit-selection workflow exposes GRB buildings, roads, water and
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parcels. These are vector products rather than rasters: selecting a
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municipality or drawing a rectangle starts a bounded backend OGC API request,
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persists the complete clipped result and analyzes the persisted
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`vector_features`. Cards show `Op aanvraag` before first use and measured
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hectares or kilometres afterwards. Full-Flanders acquisition remains disabled
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by the 20 km side limit; users select a municipality or smaller rectangle.
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The map never calls Digitaal Vlaanderen directly and never displays a
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silently truncated reference layer.
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Selecting `Hoogte & reliëf` shows the source distinction before analysis:
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DTM represents terrain after removal of buildings and other objects; DSM
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represents the visible surface including buildings and vegetation. Selecting
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