[FWTools] ESRI JPG/ with JGW files conversion
shaun.kolomeitz at epa.qld.gov.au
Fri Aug 18 00:37:02 EDT 2006
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 ???).
> -----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 ?
> This *should* work.
> For instance:
> warmerda at gdal2200% 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% 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,
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