Greg Coats mac.com> writes:
>
> I would prefer to obtain in one step the absolute value of the difference
between two pixels, in part because
> I do not see the meaning of a negative pixel value. In my example, I do not
see meaning to a signed byte value
> for a pixel channel being red=-51. Greg
Hi again,
with your help I've fix problem with "integer overflow" and now I get
correct results.
Also I clean up my code for reduce memory usage but problem with large files is
remain. I have raster with size 11779*10663 and 5 bands. When I calculate NDVI
on Linux box (2 Gb RAM, 2Gb swap, GDAL 1.
John,
from a quick look at gdal_contour.cpp, I see it uses a float value for the
contour interval, so unless there's some cast to integer at lower level in
the contour generation code, it looks more like a limitation by GdalTools,
and not in GDAL.
Indeed another quick look at
https://trac.fau
Hi all,
I have problem with geotiff files created with gdal_translate when I try to
read them with the C# bindings.
So I tested it with the GDALInfo commands.
GDALInfo.exe (The c-api) will output the correct projection information:
C:\tmp\release-1500-x64-gdal-mapserver\bin>gdal\apps\GDALI
Hi all,
I noticed that the contour tool in GdalTools only accepts integers for the
contour interval. Having this field accept float would be great for those of us
trying to manipulate contour outputs between various units.
Cheers,
John___
gdal-dev mai
I would prefer to obtain in one step the absolute value of the difference
between two pixels, in part because I do not see the meaning of a negative
pixel value. In my example, I do not see meaning to a signed byte value for a
pixel channel being red=-51. Greg
On Feb 1, 2010, at 3:08 AM, Antoni
dlr.de> writes:
> if i try the following command
>
> ogr2ogr -f PostgreSQL -nln newlayer -nlt MULTIPOLYGON PG:"host=localhost
user=admin password=xxx
> dbname=mydb" PG:"host=localhost user=admin password=yyy dbname=otherdb"
oldlayer -lco PGSQL_OGR_FID=myid
>
> everything works fine but the pr
hi all,
at http://n2.nabble.com/GDAL-Dev-f2022644.html i found one thread with the same
problem but unfortunately no answer.
http://n2.nabble.com/ogr2ogr-PGSQL-OGR-FID-is-not-work-td4026177.html#a4026177
if i try the following command
ogr2ogr -f PostgreSQL -nln newlayer -nlt MULTIPOLYGON PG:
I'm on it.
On Mon, Feb 1, 2010 at 5:16 PM, Jan Hartmann wrote:
> Hi Frank, could this be added to the documentation?
>
> Jan
>
>
> On 1-2-2010 12:37, Frank Warmerdam wrote:
>
>> Luuk Schaminee wrote:
>>
>>> Hi,
>>>
>>> I am trying to convert a 24 bit RGB TIFF file to a 8 bit TIFF file.
>>> Witho
Hi Frank, could this be added to the documentation?
Jan
On 1-2-2010 12:37, Frank Warmerdam wrote:
Luuk Schaminee wrote:
Hi,
I am trying to convert a 24 bit RGB TIFF file to a 8 bit TIFF file.
Without the –pct option this works perfectly but I want to control
the created colors with a palett
Luuk Schaminee wrote:
Hi,
I am trying to convert a 24 bit RGB TIFF file to a 8 bit TIFF file. Without the
–pct option this works perfectly but I want to control the created colors with
a palette file. So I tried the following command:
rgb2pct -pct c:\color_file.txt c:\image.tif e:\new_image.ti
Hi,
I am trying to convert a 24 bit RGB TIFF file to a 8 bit TIFF file. Without the
–pct option this works perfectly but I want to control the created colors with
a palette file. So I tried the following command:
rgb2pct -pct c:\color_file.txt c:\image.tif e:\new_image.tif.
I downloaded FWTools
On 01/31/2010 07:40 PM, Alexander Bruy wrote:
Hi all
I want to write a raster calculator and have two problems with Python
and GDAL.
My first problem: when calculating a difference between two raster bands I
get a wrong results. Raster in ERDAS IMAGINE format (HFA) and bands extracted
correctly
Hi Greg,
Il giorno Sun, 31 Jan 2010 14:58:19 -0500
Greg Coats ha scritto:
> Regarding the diff function
> "diff": computes the difference between 2 raster bands (b1 - b2)
> Since the result of diff could be a negative number, for example
> 99-150=-51, I suggest that there be an additional functi
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