Re: MrSID images - beginer's questions
From: ttvnol (gpsvn_at_yahoo.com)
Date: 10/11/04
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Date: 11 Oct 2004 09:14:36 -0700
Dave Patton <spam@trap.invalid> wrote in message news:<Xns957C63D78D260mrzaphoddirectcaold@24.71.223.159>...
> gpsvn@yahoo.com (ttvnol) wrote in
> news:677e44f5.0410050724.2ba2c2b3@posting.google.com:
>
> > I appreciate the group members to help me with my questions:
> >
> > - The Landsat 7 images do not fully cover the earth, especially not
> > cover Vietnam. Is there any indication when MrSID has a worldwide
> > coverage ?
>
> People refer to them by different names, but the "Landsat 7 images"
> are really the GeoCover product, and are available from both
> NASA and GLCF:
> https://zulu.ssc.nasa.gov/mrsid/
> http://www.glcf.umiacs.umd.edu/portal/geocover/
>
> There are two 'vintages' of the images - those collected
> around 1990, which are at 28.5 meters/pixel resolution,
> and those collected around 2000, which are at 14.25
> meters/pixel(because they were pan-sharpened).
> The coverage differs somewhat between the two datasets,
> and the file size is four times larger for the 2000 dataset.
>
> > - Is there any way to break the large MrSID images into smaller size
> > without compromise its ability to be imported by OziEzplorer ?
>
> Use an image viewer that supports exporting a subset of the
> full MrSid image, complete with geo-referencing data.
> Lizardtech's MrSid Geoviewer(which is discontinued, but
> still can be found on the net) can export to GeoTiff,
> which OziExplorer can import.
>
> > - Is there any way to use MrSID with Ozi for PPC ?
>
> Only by converting the image to OziExplorerCE's native
> OZF format(i.e. by using the Img2Ozf program), or by
> converting to ECW format, which is supported by the
> latest development version of OziExplorerCE.
Thank you all, my questions are answered !!!
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