[postgis-users] Transform

[Stephen Crawford]

ScaleX and ScaleY are identical for each tile in the original table, and 
are all different in the transformed table, which I guess should make 
sense on a transform?

I actually now think my output problem is in GDAL.  I have been 
outputting AAIGrids which I then use in geoserver.  The values are 
between 0 and 1, and I think GDAL is auto-detecting the table as int and 
giving me all 0.  At least I think that is what is happening :-)  I will 
try the process with another table.

Steve

On 2/28/2012 11:27 AM, Pierre Racine wrote:
>> OK, it seems ST_Transform is working for me, but I'm a bit confused about the
>> "raster_columns" table. The original (pre-transform) raster table is a set of 187
>> tiles.  In raster_columns 'scale_x', 'scale_y', 'blocksize_x', 'blocksize_y' are all
>> defined, and 'same_alignment'=t.
>> Then when I run AddRasterConstraints(output_table, 'rast'), these value are
>> either null or f.  Do I need to do anything else to use the reprojected data, like
>> re-tile it or something?
> What if you display their extents (rast::geometry) in OpenJump or another display tool? Do they align properly?
>
> Are the scalex and scaley, just to mention them, identical for every tile?
>
> Pierre
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-- 
Stephen Crawford
Center for Environmental Informatics
The Pennsylvania State University
src176 at psu.edu
814.865.9905