Mapping Links Pollution to Regulation

Map 1: The earlier of two images on acid rain – 1985 Map 2: The latter of two images on acid rain – 2008 Time-series GIS mapping of a 25 year study of acid rain frequency and intensity in the United States shows a decrease over time. Acid rain is rain or snowfall with a pH…

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What is Quantum GIS

What is Quantum GIS What is Quantum GIS (QGIS) – its a brand of Geographical Information System that is Open Source and so free. Its been around since around 2002 and these days is similarly functional to commercial Geographical Information Systems. In order to understand what Quantum GIS is, lets have a quick look at…

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What is GIS used for? Here’s ten ways…

Geographic information system (GIS) technology can be used for a wide variety of applications. GIS can gather, manipulate, store, and analyze geographic data which makes it useful for government, researchers and business. Following are ten common uses for GIS…

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What is Spatial Data

Line, Polyline, Polygon and Point

What is Spatial Data The four simple map structures in a GIS are Points, Lines, Polylines and Polygons. If you were to on-screen digitize the figure above then each of the circles (nodes) represent a mouse-click. There are four basic mapping structures in a GIS – Points, Lines, Polylines and Polygons… Points: You should think…

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Analysis of the census using GIS

Analysis of the census using GIS is an important  geography career! Most countries around the world conduct a regular National Census. Censuses date back to biblical times. A big reason for them has always been the need to understand how many people should be paying taxes and how much! These days the reasons are a little…

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Roadlessness as a Conservation Measure

In mid 2012, Google was approached by Kriton Arsenis, a Member of the European Parliament and its rapporteur on forests. He made the point that keeping an area roadless means that a territory is shielded against deforestation pressures. This provided an incentive for Google to investigate. Google buffered their road map by 10 km and…

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Digital Map Products and the GIS Revolution

A typical map storage facility. This one is from the US Library of Congress (photo Beatriz M Haspo, 2011) There will always be a place for paper maps because sometimes computer displays are impractical or unavailable. Besides, many people prefer paper maps over digital maps. A big issue with paper maps has always been that…

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GIS in IT

The role of GIS in IT is as varied as the organizations that use GIS. Because there are such high upfront and ongoing costs to implementing a GIS (hardware, infrastructure, data and staff) its mostly government and large corporates that hire IT professionals. The type of work you’ll end up doing will depend mostly on…

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Using GIS Technology for Improved Government Operations

Geographic information system (GIS) technology can be used to gather, maintain, store, and analyze geographic information. It can be used to keep track of everything from property locations and utility lines to traffic patterns, construction sites, and more. This versatile technology is particularly useful for government because it can help them to make better informed…

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GIS Metadata – The 5Ws

Have you ever wondered how GIS Analysts work their way through thousands of files of data? How do they manage to extract information about certain locations and their characteristics in a matter of seconds?

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