[postgis-tickets] [PostGIS] #2163: [raster] Add st_tpi

[PostGIS]

#2163: [raster] Add st_tpi
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 Reporter:  nclay   |       Owner:  dustymugs    
     Type:  patch   |      Status:  new          
 Priority:  medium  |   Milestone:  PostGIS 2.1.0
Component:  raster  |     Version:  trunk        
 Keywords:          |  
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Comment(by nclay):

 I've added the regression tests.

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2163#comment:11>
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