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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Additional info for GIS for Web Developers: Adding Where to Your Web Applications (2007)(en)(254s)
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.