Planning Support Systems
Information System (MassGIS),
Each of the above cells is 4 kilometres (about 2.5 miles) square, and represents an 8,000x8,000 pixel digital orthophoto image.
(images). Through this Web interface you may view a set of Boston area
digital orthophotos at several different zoom levels, with pan, zoom, and
download functionality. Digital orthos are quite useful since they provide
detailed imagery with known and consistent coordinates. But the raw images are
often so large and unwieldy that potential users find it too complex and time
consuming to locate, scale, and clip out manageable pieces that might help
particular tasks. This project is developing Web-based tools that overcome some
of these difficulties by using 'perl' scripts on the Web-server to do on-the-fly
extraction, formatting, and downloading of digital ortho snippets from a
repository of orthos that are catalogued and documented in accordance with the
FGDC's emerging metadata standards. You can also see a text listing of the
orthophotos available at this site.
The button above will establish a "stateful" Z39.50 connection with the metadata server. If no input is received for for some time, your session will expire and you'll need to reinitialize the search engine (e.g., by pressing the 'Begin Search Session' button above).
You may also view a list of available metadata pages.
This project is supported in part by a 1995 award from the Competitive Cooperative Agreements Program (CCAP) of the Federal Geographic Data Committee (FGDC). The server tools and ortho library have been developed and implemented on a Sun SPARCserver 1000E.
MIT Dept. of
Version 1.1: Last modified 5 February 1998.
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