Hi,
To build GDAL it's easy. Visual Studio have to be installed in the system.
You download the source code. The easiest way to do that is to download it
from http://trac.osgeo.org/gdal/wiki/DownloadSource. (Or if you have SVN
you can just do a checkout from https://svn.osgeo.org/gdal/trunk/gdal.
Thank's Even.
2012/7/12 Even Rouault
> Selon Saād HESSANE :
>
> > Hi list,
> >
> > I'm workig on a Mapserver/GDAL application, and I have to setup the
> > datasource (create tileindex and overviews) to boost the performance.
> >
> > I have two question :
> >
> >1. Can I store overviews in a
Hi list,
I'm workig on a Mapserver/GDAL application, and I have to setup the
datasource (create tileindex and overviews) to boost the performance.
I have two question :
1. Can I store overviews in a different path than the original raster
path? The original path can be in a read only folde
dal 2.0 release?
Cheers.
2012/5/20 Even Rouault
> Le dimanche 20 mai 2012 16:07:07, Saâd HESSANE a écrit :
> > Hi Even,
> >
> > The main goal of this proposal is to built using "gdalbuildvrt" VRT files
> > containing LUT or filters.
> >
> >
As I said, I also propose to have the -filter parameter that write vrt with
the VRTKernelFilteredSource class.
Best regards.
2012/5/20 Saâd HESSANE
> Hi Even,
>
> The main goal of this proposal is to built using "gdalbuildvrt" VRT files
> containing LUT or filters.
>
t test.tif
We can discuss the fact that define two parameters (-lutin and -lutout) or
just one parameter (-lut "0,4 1,5 2,6"). This is not a problem.
2012/5/19 Even Rouault
> Le samedi 19 mai 2012 18:58:05, Saâd HESSANE a écrit :
> > Hi Even and thank you for the quick r
. But the API
offers a setKernel that do exactly the same think that I hope the setLUT
method do in the VRTComplexSource.
Best regards
2012/5/19 Even Rouault
> Le samedi 19 mai 2012 16:58:07, Saâd HESSANE a écrit :
> > Hi,
> >
> > In wanting to add programmatically a LUT t
Hi,
In wanting to add programmatically a LUT to a VRTComplexSource, I read the
VRT driver source code.
VRTComplexSource have three public attributes : *double
*padfLUTInputs*, *double
*padfLUTOutputs* and *int nLUTItemCount.*
*
*
To set the LUT we have to affect directly two pointers and set the n
Hi,
Try build a tileindex : http://www.gdal.org/gdaltindex.html
It's really useful with big tiled dataset.
Best regards.
2012/4/30 Andrea Peri
> Hi,
> I have a huge set of tiffs rasters.
> Any single tiff is a geotiff tiled (256x256) and as an internal overview.
>
> To can use this raster dat
Hi list,
I would like to compile gdal 1.9 with minimalist driver list (I need just
VRT and GeoTIFF with LZW compression support). I think the only dependance
in this case is the proj4 library (linked dynamicly).
There is a simple way to do it like Linux autoconf : --without-gif
--without-png ... ?
616
>
>
> On Fri, Apr 13, 2012 at 5:39 PM, Saâd HESSANE wrote:
>
>> Hy list,
>>
>> Has anyone reproduce the bug?
>>
>> Thank you.
>>
>>
>>
>>
>> 2012/4/12 Saâd HESSANE
>>
>>> Yes of course :
>>>
>&
Hy list,
Has anyone reproduce the bug?
Thank you.
2012/4/12 Saâd HESSANE
> Yes of course :
>
>>
>> ...
>> ...
>>
>> 0
>> Gray
>>
>> 1.tif
>> 1
>> > DataType="
m has encountered an error and have to be close (the error is in
frensh sorry for my bad english...).
I'm using gdal 1.9 x64 onto Win 7 x64.
2012/4/12 Chaitanya kumar CH
> Saâd,
>
> Can you provide the vrt file causing the crash? Also, please show me the
> error messages
should be a Kernel element in a KernelFilteredSource.
> FYI, all the pixels whose kernel has a nodata pixel will be reported as a
> nodata pixel.
>
> On Wed, Apr 11, 2012 at 3:20 PM, Saâd HESSANE wrote:
>
>> Hy all,
>>
>> I have a VRT file generated with buildvrt u
Hy all,
I have a VRT file generated with buildvrt utility :
> ...
> ...
>
> 0
> Gray
>
> 1.tif
> 1
>DataType="UInt16" BlockXSize="8449" BlockYSize="1" />
>
>
> 0
>
>
> 2.tif
> 1
>DataType="UInt16" BlockXSiz
DTED files are really simple to undertand. A DTED CD-ROM is organized like
this :
- *dted (folder)*
- *D### (folder)*
- H##.dt# (file)
- H##.dt# (file)
- ...*
*
- *D### (folder)*
- *...
*
- *gazette (folder)
*
- *text (folder)
-- Forwarded message --
From: Saâd HESSANE
Date: Mon, 2 Apr 2012 15:56:27 +0200
Subject: Re: [gdal-dev] Most optimal way of using tiles ?
To: Oyvind Idland
Hy,
you can use "gdaladdo --config COMPRESS_OVERVIEW [DEFLATE | JPEG]" to
create compressed overview.
And then y
Thank you all !
2012/3/23 Frank Warmerdam
> On Fri, Mar 23, 2012 at 10:29 AM, Chaitanya kumar CH
> wrote:
> > Output pixel value = (raw pixel value * scale) + offset
>
> Exactly.
>
> The reason for scale and offset to exist is that "real world" measures
> like elevation, temperature, pressure a
o perform the same task but it is done only
> on that particular ComplexSource.
>
> On Fri, Mar 23, 2012 at 3:43 PM, Saâd HESSANE wrote:
>
>> Hy all,
>>
>> The vrt format allow defining the scale and offset element. But the
>> documentation is not clear about that
Hy all,
The vrt format allow defining the scale and offset element. But the
documentation is not clear about that :
- *Offset*: This optional element contains the offset that should be
applied when computing "real" pixel values from scaled pixel values on a
raster band. The default is 0.
e as LUT, use some other graphics application that can handle
> 16bit rasters.
>
>
> On Wed, Mar 21, 2012 at 6:00 AM, Saâd HESSANE wrote:
>
>> Thank's all for your answers.
>> I will use the LUT method, cause is the most right for me.
>>
>> Chaitanya said : &qu
e greatest value the data type of the
> raster band can hold. That would be 255, 65535 and 4294967295 for 8bit,
> 16bit and 32bit raster bands.
>
> The VRT driver calculates the intermediate values. The result here would
> be similar to using the scale ratio and offset parameters.
>
gt; output8bit.tif
>
> Best Regards,
> Brent Fraser
>
>
> On 3/20/2012 9:55 AM, Saâd HESSANE wrote:
>
> Hi list,
>
> I use gdal_translate to convert 16bits images to 8bits images. The
> gdal_translate have the -scale argument to specify the convertion range
> (sour
Hi list,
I use gdal_translate to convert 16bits images to 8bits images. The
gdal_translate have the -scale argument to specify the convertion range
(source->destination).
If I change the destination range (dst_min and dst_max), I can do manually
a brightness correction (also a contrast correction)
I never use gdal_retile, but i use gdaladdo. It's perfect and there's no
qualtity degradation.
gdaladdo create one tiff (or other format if you want) overview, containing
different level.
Syntax : gdaladdo -ro filename 2 4 8 16 32
http://www.gdal.org/gdaladdo.html
2011/3/15 Devrim Baris Acar
>
Thank's for your suggestion.
I test the OGRLayer::SetFeature() method, but it don't write the file after
that. I think the reason is what say Chaitanya (thank you) about the driver
which don't write until the handle is closed.
I think the best way is to write a CSV/VRT file.
I'm trying now.
2011/
Hy list,
I' m trying to add on the fly points comming from GPS to a shapefile.
But the only way i find is to delete the feature from the shapefille, and
create a new feature with the added point. There's another way?
Thank you
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