Re: MrSid satellite images
From: Costas Margetousakis (margetousakis.c_at_envcart.aegean.gr)
Date: 02/11/05
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Date: Fri, 11 Feb 2005 03:33:21 +0200
On 17 Nov 2004 07:56:05 -0800, gpsvn@yahoo.com (ttvnol) wrote:
>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.
You can find Geoviewer at http://www.landsystems.com/
it will run fully for only 4 hours. Of course you can use a commercial
software like Erdas Imagine to import Mrsid and export any part of it
as GeoTiff
>> - 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.
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