[ gpsdrive ] Errors with gdal_warp [SOLVED]

[R. G. Newbury]

Chris h wrote:
> On Wednesday 19 November 2008 14:40:28 R. G. Newbury wrote:
(Added back for clarity) I'm trying to transform NOAA RNC charts to 
tif's (and then use Hamish' gdalslice to make tiles). BUT, I get errors 
with gdalwarp:

> Interesting. I was working the same problem last night using the same chart as 
> hamish and it also kept blowing up on me. Im not sure but I think its 
> something with the actual chart, as qgis also gives me strange errors on the 
> charts version I am using. 
> 
> What chart are you using? I will try to replicate at this end with the set I 
> have, which are now at least six month old if not older. They came on DVD 
> from a supplier in BC around March of last year. 

In this case I was using a one or two day old download of charts 11466 
and 11467 which I grabbed to use in tuning the 'for' loop in a script 
intended to create tif files from all the KAP files in sub-folders.

When that failed, I tried to unzip the much larger zip files I had 
downloaded in July AND THEY WILL NOT OPEN!....Not recognized as a zip 
file!!  HUH? Whatever....

This morning I have just tried to run the gdalwarp program in a cut down 
version of the script on my desktop....and got an 'undefined' reference 
error from gdalwarp!. That was against the latest 'yum install' versions 
of gdal-[devel] on the Fedora 8 'everything' repo (1.4.2)...So I have 
just downloaded and made 1.5.3 from source.  (Ain't software such 
fun...how to waste time while having fun...Luckily I can talk on the 
phone *and* download, untar, configure, make && make install at the same 
time. Including a digression to fix an include error in the source...)

So I now have gdal version 1.5.3 and as pointed out by Hamish in another 
message,

*the error is actually due to the use of '-co COMPRESS=DEFLATE' in the 
command line*.

With that included in the call, gdalwarp throws errors, creating a file, 
which gthumb sees as '0 x 0' pixels. Without that extra switch, gdalwarp 
creates a (much bigger) file, which gthumb and other viewers can happily 
open and use.

Geoff












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