[Gdal-dev] Help With Transparent Colors

[Reinaldo Escada Chohfi]

GeoExpress has both GUI and command line versions for batch 
processing.  You can add 1000s of images to process using either version.

R.

At 10:15 PM 1/24/2006, Dolloff, Matthew D. (JSC-ER7) wrote:
>I’m not sure how well GeoExpress is an option because we are talking about 
>thousands of files and GB of data.  I need to batch the process.
>
>
>----------
>From: Reinaldo Escada Chohfi [mailto:rec at geodesign.com.br]
>Sent: Tuesday, January 24, 2006 5:48 PM
>To: Frank Warmerdam; Dolloff, Matthew D. (JSC-ER7)
>Cc: gdal-dev at lists.maptools.org
>Subject: Re: [Gdal-dev] Help With Transparent Colors
>
>You can also use the GeoExpress 5.0 trial download from LizardTech ( 
>www.lizardtech.com) that allows you to mosaic and reproject .sid images in 
>one step.  The trial download allows you to work with images that already 
>are in .sid format without problems.  That way you don't need to go from 
>MrSID to GeoTiff and make a large mosaic as a .sid image.
>
>Best regards,
>
>Reinaldo
>
>At 09:06 PM 1/24/2006, Frank Warmerdam wrote:
>
>On 1/24/06, Dolloff, Matthew D. (JSC-ER7) <matthew.d.dolloff at nasa.gov> wrote:
> >
> >
> >
> > Hello.  I am trying to convert some MrSID images into Geotiffs and tiling
> > them together.  The MrSIDs are in state plane coordinate system and I need
> > them in WGS84.  So I convert the MrSIDs to geotiffs using mrsiddecode from
> > lizard tech.  Then I use gdal warp to change the projection type.  Then use
> > gdal_merge to merge them together.  The problem is that I end up with a
> > black collar when I warp the images and then when I merge them the images
> > cover each other up.  Is there anyway, that I can crop those collars out?
> > Here is the link where I am getting the sids
> > 
> http://www.nysgis.state.ny.us/gateway/mg/2001/suffolk/01ic_t_babylon_l06col.htm 
>
>
>Matt,
>
>A couple of approaches would be:
>
>  o Use gdal_merge to merge the TIFFs before
>     reprojecting them.  Then gdalwarp the resulting
>     mosaic.
>
>  o Or create a big WGS84 mosaic file and gdalwarp
>     each non-WGS84 file into that, mosaicing at the
>     same time as reprojecting.
>
>In the future gdalwarp will support multiple input
>files, essentially replacing gdal_merge for many
>purposes.  This is already in CVS if you were building
>from source.  Another option would be to generate a
>nodata value or better yet an alpha channel in the files
>output by gdalwarp to keep track of the nodata pixels.
>
>My suggestion would be the top most option, mosaic
>then reproject.  Keep in mind that GeoTIFF only
>supports file sizes up to 4GB.  So if your mosaic is
>going to be large, you may need to do it in a format
>like Erdas Imagine.
>
>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    | Geospatial Programmer for Rent
>
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