[postgis-users] Rasters

[Gerry Creager]

I've mentioned this a few minutes ago, but for me, there are 2 atomics.

In terms of a Level III radar image, say, 0.5 deg elevation, base 
reflectivity, we are interested in 1km x 1km pixels surrounding a radar 
site.  1x1 km is the basic resolution of the reflectivity data, so 
that's a cell.  Data can be referenced as radial/vector (or that 
converted to coordinate data).

For Level II data we have reflectivity, velocity and spectrum width (std 
dev of velocity).  These are effectively voxels and are radial and range 
(range-gate) referenced.  The data presented as a 3d volume scan of all 
the radials and all the elevations with a reference time.

I'll work on some p-code SQL for you.

It's a little out of the box but I sense the PostGIS can work with these 
data.

Thanks, gerry
gerry


Paul Ramsey wrote:
> OK, raster people.  My problem is that I cannot envision the use  cases 
> for raster in the database, so, make it easy for me! :)
> 
> - What is the atomic unit of storage for rasters in the database?  Is  
> it complete scenes?  Something else?
> - What is some SQL I would apply against my raster tables?  Make up  
> some descriptive function names and show me some example SQL and tell  
> me what it does.
> - How do vector data and raster data interact?  Note the atomicity  
> question above.
> 
> P.
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
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