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Geospatial Data
Geospatial Data
This section of the Web site provides all the necessary data state and local officials
will need to incorporate imperviousness into their water resource planning
activities. Included in this section are three main types of data: Landsat
7 EMT+ data, derived data, and vector GIS data. The Landsat 7 EMT+ data
includes raw satellite imagery in bands 1-7; and the 8-bit false color composite
images 321, 432, 453, and 742. The derived data includes the impervious
surface maps derived and clipped for each jurisdiction in the Chesapeake
Bay basin; and a Normalized Difference in Vegetation Index (NDVI) for each
jurisdiction, which essentially shows plant growth, or "greenness;"
and a 40 Class Unsupervised Classification, which corresponds to 40 classes
of land cover. Finally, a variety of other vector GIS data sets are made
available, including county boundaries, land use/land covers, the National
Wetlands Inventory, railroads, roads, streams, water bodies, and watersheds.
Additionally, to encourage the use of the data, this section also includes
quick start guides that teach Web site visitors how to use the various data
with a variety of software packages including ArcView, ArcExplorer, IDRISI,
and Erdas Imagine.
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