[postgis-devel] [PostGIS] #2126: [raster] Convex hull of an empty raster

[PostGIS]

#2126: [raster] Convex hull of an empty raster
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 Reporter:  dustymugs  |       Owner:  dustymugs    
     Type:  defect     |      Status:  new          
 Priority:  medium     |   Milestone:  PostGIS 2.0.3
Component:  raster     |     Version:  2.0.x        
 Keywords:             |  
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Comment(by dustymugs):

 For rasters, it may be that the convex hull is _NOT_ polygonal in three
 cases.

 Case 1 and Case 2: raster width OR height is zero (but other dimension is
 NOT zero)

 Possible Answer: LINESTRING along the non-zero dimension from upper-left

 Case 3: raster width AND height is zero

 Possible Answer: POINT of upper-left.

 Granted, I'm just as happy returning POLYGON EMPTY as it is keeping it
 simple. But I wonder if raster should be as arbitrary as geometry.  I
 wonder what ArcGIS, ENVI and ERDAS says...

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/2126#comment:3>
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