[FWTools] ESRI JPG/ with JGW files conversion

[Shaun Kolomeitz]

Frank,
The original files were called *.jpg and *.JGW, but I renamed them to .jgw (using Windows Explorer).
Aparently I needed to kill my session and restart FWtools before the change was recognised (I don't understand why I would need to do this ???).
Many thanks,
Shaun

> -----Original Message-----
> From: Frank Warmerdam [mailto:warmerdam at pobox.com]
> Sent: Friday, 18 August 2006 2:05 PM
> To: Shaun Kolomeitz
> Cc: fwtools at lists.maptools.org
> Subject: Re: [FWTools] ESRI JPG/ with JGW files conversion
> 
> 
> Shaun Kolomeitz wrote:
> > Dear Listers,
> > 
> > I have struck a problem converting a JPG file with an ESRI 
> world file (JGW) and trying to maintain the position of the 
> image in "real world" coordinates.
> > When I do a GDALINFO on the images for example -
> > 
> > Z:\image\9541\0.6>gdalinfo 9541-1122.jpg
> > Driver: JPEG/JPEG JFIF
> > Size is 1608, 3227
> > Coordinate System is `'
> > Corner Coordinates:
> > Upper Left  (    0.0,    0.0)
> > Lower Left  (    0.0, 3227.0)
> > Upper Right ( 1608.0,    0.0)
> > Lower Right ( 1608.0, 3227.0)
> > Center      (  804.0, 1613.5)
> > Band 1 Block=1608x1 Type=Byte, ColorInterp=Red
> > Band 2 Block=1608x1 Type=Byte, ColorInterp=Green
> > Band 3 Block=1608x1 Type=Byte, ColorInterp=Blue
> > 
> > This is despite a JGW (world file) existing.
> > As such when I try to translate the image it loses the 
> appropriate conversion parameters listed in the JGW file.
> > 
> > Any suggestions on how I could convert these files using 
> GDAL commands ?
> 
> Shaun,
> 
> This *should* work.
> 
> For instance:
> 
> warmerda at gdal2200[277]% ls -l utm*
> -rw-r--r--  1 warmerda users     98 Sep 11  2005 utm.jgw
> -rw-r--r--  1 warmerda users 104905 May  1  2001 utm.jpg
> warmerda at gdal2200[278]% gdalinfo utm.jpg
> Driver: JPEG/JPEG JFIF
> Size is 512, 512
> Coordinate System is `'
> Origin = (440720.000000,3751320.000000)
> Pixel Size = (60.00000000,-60.00000000)
> Corner Coordinates:
> Upper Left  (  440720.000, 3751320.000)
> Lower Left  (  440720.000, 3720600.000)
> Upper Right (  471440.000, 3751320.000)
> Lower Right (  471440.000, 3720600.000)
> Center      (  456080.000, 3735960.000)
> Band 1 Block=512x1 Type=Byte, ColorInterp=Gray
> 
> Is there any chance that your .jgw files name is actually different
> in some subtle way - perhaps one of the "1"s is an "l" or something
> like that?
> 
> Is it possible that Z: is a unix network drive and is case
> sensitive?  If so try renaming everything to be lower case.
> 
> Best regards,
> -- 
> ---------------------------------------+----------------------
> ----------------
> I set the clouds in motion - turn up   | Frank Warmerdam, 
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | President OSGF, 
http://osgeo.org



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