[postgis-tickets] [PostGIS] #2603: [raster] Add docs for ST_MapAlgebra with mask parameter

[PostGIS]

#2603: [raster] Add docs for ST_MapAlgebra with mask parameter
------------------------+---------------------------
  Reporter:  dustymugs  |      Owner:  dustymugs
      Type:  task       |     Status:  new
  Priority:  critical   |  Milestone:  PostGIS 2.2.0
 Component:  raster     |    Version:  trunk
Resolution:             |   Keywords:
------------------------+---------------------------

Comment (by robe):

 dustymugs if you are around, I'm working on adding this to docs. I presume
 this is new in 2.2.0 (so flagging it as such).  Can you explain what the
 mask does?  From example in rt_mapalgebra_mast.sql -- looks like the mask
 is a matrix of some sort which I am guessing only gets applied to the
 neighborhood of pixels to set pixels as nodata.

 So I'm guessing it does similar to :

 http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=selectmask

 (I apologize now for linking to competitor documentation :) )

 If I don't hear back from you before Paul pulls the switch, I'll just
 document the protos and be very vague about what it does not to embarrass
 myself.

--
Ticket URL: <https://trac.osgeo.org/postgis/ticket/2603#comment:2>
PostGIS <http://trac.osgeo.org/postgis/>
The PostGIS Trac is used for bug, enhancement & task tracking, a user and developer wiki, and a view into the subversion code repository of PostGIS project.