[postgis-devel] [PostGIS] #903: [raster] ST_Reclass

[PostGIS]

#903: [raster] ST_Reclass
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 Reporter:  dustymugs       |       Owner:  dustymugs            
     Type:  task            |      Status:  new                  
 Priority:  medium          |   Milestone:  PostGIS Raster Future
Component:  postgis raster  |     Version:  trunk                
 Keywords:                  |  
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Comment(by dustymugs):

 Replying to [comment:3 pracine]:
 > 2) I was planning "rangemin <= x < rangemax". To solve the rangemax
 issue when x = rangemax you could introduce the keyword "rangemax" saying
 "if you use the "rangemax" keyword for rangemax, '<=' is used instead of
 '<'" in the comparison. To be convenient and symetrical you could also
 support the "rangemin" keyword even if we don't really need it.
 >

 In thinking about how to properly detail the range intervals, I think
 using keywords such as rangemax is crude.  I'm thinking about notating the
 intervals similar to the math world.

 {{{
 1. [a-b] = a <= x <= b

 2. (a-b] = a < x <= b

 3. [a-b) = a <= x < b

 4. (a-b) = a < x < b
 }}}

 !#3 above would be the default evaluation of x in the range a-b.  The use
 of square brackets and parentheses are optional, so the examples below
 would be permitted.  Missing notations substitute the appropriate notation
 from !#3 above.

 {{{
 [a-b = a <= x < b

 (a-b = a < x < b

 a-b] = a <= x <= b

 a-b) = a <= x < b
 }}}

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/903#comment:7>
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