TNTmips

Working with Massive Geodata Objects

The key to working with large data is to get rid of any unnecessary largeness. For raster objects, unnecessary largeness is removed by compression. Whether or not lossy compression is acceptable will depend on the intended use for the data. There are a variety of techniques used to remove unnecessary largeness from vector objects, which include database modifications, filtering, and thinning. With vector objects, this process is generally referred to as “cleanup.”

working with massive data
getting the parts
USGS high-resolution imagery
null value masks
really massive rasters
standard attributes and topology

merge vectors first
merging vector objects
transferring attributes
visibility control by map scale
thinning vector lines
changing to planar topology

	PDF Release Version (file date: Wednesday, 22-Mar-2006 23:04:34 CST)
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