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General GIS Topics and Points of Interest ESRI GIS Dictionary
GPS - Global Positioning System
General GIS Topics and Points of Interest...
United States Geological SurveyEnvironmental Systems Research Institute
GIS Dictionary of TermsWhat is the difference's between recreational and professional grade GPS Devices?
MrSID (Multi-resolution Seamless Image Database) is an image compressor, viewer, and file format for extremely large raster graphics images. MrSID, created by LizardTech, works by putting together hundreds of small image tiles into one large seamless image that can be compressed and decompressed with little or no degradation.
One problem previously associated with raster images was the long amount of time it took to open very large files. The creators of MrSID overcame that problem by giving the user the ability to decompress just the portion of the image they wanted to view. The user can move from one part of the image to another quickly without having to wait for the entire image to decompress.
Another problem associated
with massive raster images was the large amount
of storage space they required. MrSID uses a
patented "wavelet" technology first developed at
the National Research Laboratories at Los Alamos
to achieve a compression ratio of 20:1 for
The wavelet technology used by
MrSID relies on advanced mathematical
algorithms both to compress an image and
build the
MrSID Viewer (GeoViewer) Screen Shot Showing Color Photography...
MrSID Viewer Screen Shot Showing decades-old DOQQ's
