The MrSid format consists of highly compressed imagery in a proprietary format. It may be an orphan at this point, since it has been quite some time since I have seen any data in this format. This format might be losing the battle of the proprietary formats, which would be a nice victory for open formats.
For direct viewing in MICRODEM, download
Unzip the two programs and place in c:\microdem\mrsid. You should have two directories, bin and lipproject.
The most recent version appears to get serious about projections and needs a set of libraries and definitions.
You might have to download the C++ restributables, if you get a message about a missing DLL.
When you do this, you can do the following:
|After opening a preview image, there will be a "MrSid" button on the map toolbar, to open higher resolution imagery. These can be huge, so Subset & zoom and do not get greedy with the area you request.|
MICRODEM extracts MrSid imagery to Geotiff and stores it in the Windows Temp directory. It will be deleted when the program closes To save these Geotiffs, use the File, Save satellite image menu option.
|Set the maximum size of the Geotiff images to extract, in pixels, on the Imagery tab of the options form. The default is 2400, which will open a Geotiff no bigger than 2400x2400 pixels, which will be about 20 MB in size as a geotiff (4 MB each in 3 bands). If you had a MrSid that was 50,000 by 40,000 pixels, it would require 6 GB to extract at full resolution as a Geotiff, would take a very long time, and might well not display in MICRODEM.|
If you get historical scanned map in MrSid format, you need to extract the image at the resolution and subset level you want. Then save the image as a JPEG or PNG file, and register it.
Last revision 5/17/2018