[postgis-users] Raster Support...
john.cole at uai.com
Fri Aug 25 13:08:43 PDT 2006
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.
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Stephen
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.
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
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.
postgis-users mailing list
postgis-users at postgis.refractions.net
This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the sender. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail.
More information about the postgis-users