Hi GDAL Developers,
I have one GeoTIFF file with 2 bands. The data type is Byte. I want to
calculate (Band2-Band1)/(Band2+Band1).
But the following command provided a dark image:
gdal_calc.py -A infile --A_band 1 -B infile, --B_band 0 --outfile outfile
--calc (A-B)/(A+B)
Does gdal_calc.py not
I am not sure, but you can do the following to make sure:
cp infile infile2
gdal_calc.py -A infile --A_band 1 -B infile2 --B_band 0 --outfile outfile
--calc (A-B)/(A+B)
Also, perhaps the extra comma in your command might be to blame -B infile,
Etienne
On Tue, Jul 29, 2014 at 3:46 AM, Cleo
Thanks for your response.
I tried the followings:
gcalc = 'C:\\Users\\cleo\\Documents\\gdalpys\\gdal_calc.py'
##I produced second file (b)as the copy of first(a)
a = 'D:\\a.tif'
b = 'D:\\b.tif'
outfile = 'D:\\result.tif'
expr = '(A-B)/(A+B)'
On 07/29/2014 04:04 PM, Cleo Drakos wrote:
Thanks for your response.
I tried the followings:
gcalc = 'C:\\Users\\cleo\\Documents\\gdalpys\\gdal_calc.py'
##I produced second file (b)as the copy of first(a)
a = 'D:\\a.tif'
b = 'D:\\b.tif'
outfile = 'D:\\result.tif'
expr = '(A-B)/(A+B)'
Cleo Drakos cleo21drakos at gmail.com writes:
Thanks for your response.I tried the followings:
gcalc = 'C:\\Users\\cleo\\Documents\\gdalpys\\gdal_calc.py'
##I produced second file (b)as the copy of first(a)
a = 'D:\\a.tif'
b = 'D:\\b.tif'
outfile = 'D:\\result.tif'
expr =
Hello,
I'm having trouble creating a shapefile. My problems are isolated to the
following c++ block:
const char *pszDriverName = ESRI Shapefile;
GDALDriver *poDriver;
GDALAllRegister();
poDriver = GetGDALDriverManager()-GetDriverByName(pszDriverName );
if( poDriver == NULL )
On Tue, Jul 29, 2014 at 1:46 PM, Michael Aschenbeck
m.g.aschenb...@gmail.com wrote:
Hello,
I'm having trouble creating a shapefile. My problems are isolated to the
following c++ block:
const char *pszDriverName = ESRI Shapefile;
GDALDriver *poDriver;
GDALAllRegister();
Thank you, I was following the tutorial for the newest version while I was
on a 1.1x version. The links you supplied helped!
On Tue, Jul 29, 2014 at 2:21 PM, Kyle Shannon k...@pobox.com wrote:
On Tue, Jul 29, 2014 at 1:46 PM, Michael Aschenbeck
m.g.aschenb...@gmail.com wrote:
Hello,
yes, I checked the histogram and the out image is completely black.
cleo
On Wed, Jul 30, 2014 at 1:53 AM, Jukka Rahkonen jukka.rahko...@mmmtike.fi
wrote:
Cleo Drakos cleo21drakos at gmail.com writes:
Thanks for your response.I tried the followings:
gcalc =
Even if I converted the input file into Float 32 at first, the resulted
image is still totally black.
cleo
On Tue, Jul 29, 2014 at 11:20 PM, Vincent Schut sc...@sarvision.nl wrote:
On 07/29/2014 04:04 PM, Cleo Drakos wrote:
Thanks for your response.
I tried the followings:
gcalc =
Hi Cleo,
Just been dealing with this type of issue.
It’s likely that the byte datatype is overflowing.
Try something like:
--calc (A.astype(int)-B.astype(int))/(A.astype(int)+B.astype(int))
Actually you might only need to cast one of the bands from byte to int, so the
syntax could be:
Hello Jeremy
Thanks for your response.
I am still getting the completely black image.
The input image I am working with is here:
http://commondatastorage.googleapis.com/earthenginepartners-hansen/GFC2013/Hansen_GFC2013_last_00N_000E.tif
cleo
On Wed, Jul 30, 2014 at 11:15 AM, Jeremy
Dear all:
The problem I was facing has been solved. I detected that the problem was
with the band number '0'. Solution is: the band number starts from '1'.
But, the gdal documentation says that the default band number is '0'.
http://www.gdal.org/gdal_calc.html
The documentation should be
Hi Jeremy
Your idea is grateful.
The following code worked for me:
--calc (A.astype(float32)-B A.astype(float32)+B)
cleo
On Wed, Jul 30, 2014 at 11:15 AM, Jeremy Palmer jpal...@linz.govt.nz
wrote:
Hi Cleo,
Just been dealing with this type of issue.
It’s likely that the byte
Hi Devs,
I'm just planning to convert my own 'in-house' drawing styles management to
using the styles management built into OGR. The documentation at
http://www.gdal.org/ogr_feature_style.html suggests that styles can be in a
'.ofs' file to be automatically associated with a data source of
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