topic Re: SID Projection Issues in Data Management Questions

SID Projection Issues

ChadFoster — Fri, 04 Feb 2011 22:58:25 GMT

I am trying to us the project raster tool to re-project a sid file but it will not let me save the re-projection to a sid format. Does anyone know how this can be accomplished?

The sid projection is in NAD_83_UTM_ZONE_11N and I need to re-project to a WGS_1984.....

Re: SID Projection Issues

RobertBerger — Fri, 04 Feb 2011 23:22:07 GMT

Hi,

You can define a projection for the raster. But reprojecting requires to write out the dataset again. MrSid is not an out-of-the-box writable format for ArcGIS. You would need a special license for that. But you can write out to other formats such as IMG or Jpeg2000.

Robert

Re: SID Projection Issues

ChadFoster — Mon, 07 Feb 2011 14:29:57 GMT

What kind of license are you refering to? Is this some sort of Arc based license or third party software?

Thanks for the clarification...

Re: SID Projection Issues

JohnSobetzer — Mon, 07 Feb 2011 16:05:31 GMT

Go to www.lizardtech.com if you want software that can: 1) compress original imagery to the sid or jp2 format, 2) (for less money) crop, mosaic, or otherwise manipulate imagery that is already in the sid or jp2 format and keep it in those formats, or 3) (free software) clip and save sid or jp2 in other formats such as geotiff. They are GeoExpress (priced by the amount of imagery you want to be able to compress), GeoExpress Tools (around $1500) and GeoViewer (free). Older versions of ArcGIS came with the ability to compress to sid but only for images under 50MB or so which is not a file size but a kind of pixel count. Given the price you may want to rely on ArcMap's ability to project on the fly, or if you really need a reprojected raster, using the jp2 option in ArcGIS, which is free. Jp2 (jpeg2000), sid and ecw are all wavelet compression rasters, but the latter two are proprietary.