[postgis-users] Raster Support...

[John Cole]

I would like to be able to intersect vector geometries with a range (or
ranges) of raster values.  An example, given a DEM, what schools would flood
given a 2m rise in water.  Or, given a NEXRAD raster, what facility is
getting hit by extreme rain.

John

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Stephen
Marshall
Sent: Friday, August 25, 2006 2:58 PM
To: postgis-users at postgis.refractions.net
Subject: [postgis-users] Raster Support...

Since I got this conversation started today, I'm willing to give some 
examples of what I want to do to with raster data stored in the RDBMS:

1. Generation of GEOMETRY objects from the raster, e.g.
- Interpolation
   Interpolate values in the raster to a user-specified geographic point
- Line contouring
   Generate lines of constant values throughout the raster
- Filled contouring
   Generating geo-navigated polygons from the contours.  This is like 
line contouring, but with extra code to handle conditions at the 
boundary of the raster.

2. Remapping raster data (generating rasters from rasters)
-  Extracting a sector of an image (i.e. a  subset of the total image)
-  Reprojecting rasters into new raster structure in a different spatial 
reference system

3. Associating physical values with raster pixels values
- Somewhat a part of the interpolation/contouring process, I would like 
rasters to have associations between their pixel values are physical 
values, like elevation, temperature, or precipitation amount.  Thus, I'd 
like georasters to have some way to associate a pixel-to-value mapping, 
so pixel values could be converted to physical values.

I'm sure I'd come up with more if I thought for a while, but its a 
high-level start.  I encourage the other folks who have posted to share 
their wish list of raster functionality.

Steve Marshall
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