Details Ticket 3559


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Serial Number 3559
Subject more resample methods
Area wish6
Queue grass
Requestors kyngchaos@kyngchaos.com
Owner none
Status resolved
Last User Contact Wed Feb 14 22:00:02 2007 (2 yr ago)
Current Priority 30
Final Priority 70
Due No date assigned
Last Action Wed Feb 14 22:00:02 2007 (2 yr ago)
Created Mon Aug 22 20:01:10 2005 (3 yr ago)

Transaction History Ticket 3559


Mon, Aug 22 2005 20:01:10    Request created by guest  
Subject: more resample methods

Platform: Mac OSX
grass obtained from: Trento Italy site
grass binary for platform: Compiled from Sources

Either add bilinear and cubic resample commands (ie r.resamp.cubic), or expand
r.resample with a 
method option to include these (similar to r.proj).

Up to now I've been able to work around this by using r.proj on a symlink to
the location I'm working in, 
so I can used r.proj's bilinear and cubic methods.

But, there is a limitation to this - taking a global projection, such as Robinson,
I project it in halves 
from latlong.  This eases memory use, and more important masks out the corners
automatically that 
would normally be filled in as a result of the backwards projection method used
for rasters.  Then I 
patch the halves together and use the r.proj trick to resample that.  Unfortunately,
since I'm resampling 
the whole region, the corners are filled back in.

I generally like to initially project rasters at close to the source resolution,
then resample, instead of 
projecting directly to the desired resolution, so I can reuse it for multiple
resolutions and save the 
initial projecting and patching time. (in case anyone might suggest I project
directly to the desired 
resolution to work around this problem)
Wed, Feb 14 2007 22:00:02    Status changed to resolved by msieczka  
Wed, Feb 14 2007 22:00:02    Mail sent by msieczka  
As William has informed me off-RT, this issue has been addressed in
r.resamp.interp. Closing it.

Maciek
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