Re: MrSID images - beginer's questions
From: Dave Patton (spam_at_trap.invalid)
Date: 10/08/04
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Date: Fri, 08 Oct 2004 16:48:54 GMT
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.
-- Dave Patton Canadian Coordinator, Degree Confluence Project http://www.confluence.org/ My website: http://members.shaw.ca/davepatton/
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