[gdal-dev] Problem with BIL files and GDAL

[Belén]

Hi again,
I tried yesterday the option "-ot UInt16" but the result was the same. 

This is the result os executing "gdalinfo -stats":

Driver: EHdr/ESRI .hdr Labelled
Files: prueba.bil
       prueba.hdr
       prueba.stx
Size is 4000, 4000
Coordinate System is `'
Origin = (504815.000000000000000,4766395.000000000000000)
Pixel Size = (10.000000000000000,-10.000000000000000)
Corner Coordinates:
Upper Left  (  504815.000, 4766395.000)
Lower Left  (  504815.000, 4726395.000)
Upper Right (  544815.000, 4766395.000)
Lower Right (  544815.000, 4726395.000)
Center      (  524815.000, 4746395.000)
Band 1 Block=4000x1 Type=UInt16, ColorInterp=Undefined
  Min=87.000 Max=263.000
  Minimum=87.000, Maximum=263.000, Mean=220.726, StdDev=23.721

You gave me a great idea, I think PNG supports UInt16 but I'v tried using -ot BYTE  and it works. 
Thanks you very very much for your help. You saved my life!!

Regards. 
Belén Muñoz.

From: daniele.romagnoli at geo-solutions.it
Date: Wed, 30 Jul 2014 12:58:44 +0200
Subject: Re: [gdal-dev] Problem with BIL files and GDAL
To: beln1 at hotmail.com
CC: gdal-dev at lists.osgeo.org

Hi,
Since we are here, you could re-run gdalinfo -stats on your dataset. (Maybe you see a black image due to a dynamic concentrated on low values).
Moreover you may consider using the "-scale" option on gdal_translate to scale your values to byte or make sure to preserve the output type with the option "-OT UInt16".


Honestly, I don't remember if PNG support 16 bits (But would say "yes") and if the tool/browser/what else you will use to open it will show you correctly.

Hope this helps.
Regards,

Daniele

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On Wed, Jul 30, 2014 at 12:26 PM, Belén <beln1 at hotmail.com> wrote:





Hi Daniele,
Thank you for your answer.
This is the output of gdalinfo:

Driver: EHdr/ESRI .hdr Labelled
Files: prueba.bil
          prueba.hdr
Size is 4000, 4000
Coordinate System is `'


Origin = (504815.000000000000000,4766395.000000000000000)
Pixel Size = (10.000000000000000,-10.000000000000000)
Corner Coordinates:
Upper Left  (  504815.000, 4766395.000)
Lower Left  (  504815.000, 4726395.000)


Upper Right (  544815.000, 4766395.000)
Lower Right (  544815.000, 4726395.000)
Center      (  524815.000, 4746395.000)
Band 1 Block=4000x1 Type=UInt16, ColorInterp=Undefined

Thank you again!!

Regards.


Belén Muñoz.

From: daniele.romagnoli at geo-solutions.it
Date: Wed, 30 Jul 2014 12:20:09 +0200


Subject: Re: [gdal-dev] Problem with BIL files and GDAL
To: beln1 at hotmail.com
CC: gdal-dev at lists.osgeo.org



Hi,
could you run a gdalinfo on your origin file and provide us the output?
Wondering if its datatype is float and a straight gdal_translate (without scaling applied) truncate all values when going to Byte PNG.





Cheers,
Daniele
==

GeoServer Professional Services from the experts! Visit

http://goo.gl/NWWaa2 for more information.

==


Ing. Daniele Romagnoli
Senior Software Engineer

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054  Massarosa (LU)
Italy
phone: +39 0584 962313


fax:      +39 0584 1660272

http://www.geo-solutions.it


http://twitter.com/geosolutions_it

-------------------------------------------------------



On Wed, Jul 30, 2014 at 11:22 AM, Belén <beln1 at hotmail.com> wrote:







Hello!
My name is Belén and i'm trying to convert a .bil file (.bil and .hdr) to a .png using gdal_translate, it seems to work fine, there are no error messages but when I open the .png file, I only have a big completely black square.




There's some special thing I should be doing? I'd appreciate any help, because I'm completely lost.

Thank you very much in advance.

Regards.

Belén Muñoz.
 		 	   		  

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