Changes between Version 6 and Version 7 of WorldMappingIssues

Timestamp:

Feb 24, 2010, 1:05:05 AM (14 years ago)

Author:

strk

Comment:

add "tiled" use case

WorldMappingIssues

@@ -12 +12 @@
 
 In the case of world spanning polygons this logic can sometimes mis-fire resulting in features getting stretched over more than 360 degrees. 
+
+== Rendering features multiple times when requested bounding box spans the Dateline ==
+
+When the request is for extent wider or taller the valid input data range it would be useful to duplicate each feature more times to cover the whole extent.
+This would be tipically useful for long-lat data where a point at -180,0 may also be represented as being at 180,0 and at 540,0 and at -540,0 and so on.
+The idea is that rather than starting from input and project each point to output a opposite strategy should be taken (take each of the output pixel and find
+what's there). 
+
+It has been reported by Frank [1] that the suggested strategy is already in place for raster layers but only if they undergo resampling.
+
+[1] http://lists.osgeo.org/pipermail/mapserver-dev/2010-February/009713.html
+
 
 == BBOX Transformation ==