Download GIS for Web Developers: Adding Where to Your Web by Scott Davis PDF

By Scott Davis

With this publication readers can develop into genuine geographic programmers utilizing the Java programming language. they are going to locate operating code examples in Java utilizing a few of the many GIS-oriented purposes and APIs, and have the ability to exhibit GIS facts on the internet, control GIS information, and programmatically shop and retrieve it in geographically enabled databases.

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Decimal degrees is another popular way of expressing location coordinates, especially in computer-based GIS systems. 5 degrees. In addition to being more computer-friendly, decimal degree notation is a bit more compact as well. 037684). ) Converting DMS to DD is a piece of cake. There are various websites8 that do this for you “automagically,” or you can do the math yourself: simply divide the minutes by 60; divide the seconds by 3,600; and then sum the degrees, minutes, and seconds. Meters Projections that use lat/long points are generally most useful for showing the absolute location of a feature.

The USGS uses sexagesimal notation to describe many of its maps. For example, to find free satellite imagery on the Web, use the word DOQQ in your web search. A Digital Orthographic Quarter-Quadrangle (DOQQ) is a standard USGS imagery product. Let’s parse that monstrosity. Digital is the easy part—this isn’t a paper map; it’s a digital file that you can use in a GIS application. Orthographic means basically that it is a top-down view. ”) So far, the USGS is telling us that this is a digital, top-down view of the earth.

More accurate than a geoid is a true digital elevation model (DEM). A DEM isn’t a mathematical approximation of elevation; it is a true measurement of height at regular intervals along the surface of the earth. The Shuttle Radar Topology Mission (SRTM) DEM7 is produced by NASA. It is a raster product that offers actual elevation points every 30 m (100 feet) over the United States and every 90 m (300 feet) over the rest of the world. Many commercial data vendors can sell you DEMs at an even higher level of accuracy than the SRTM data.

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