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  Washington                                       August 2009 | Vol. 31 | 08.26.09
 
 
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GIS goes vertical, with integration across state, local, federal lines
GIS applications and data are increasingly being linked thanks to informal information-sharing efforts
 
Government Computer News
 (GCN)--The power of geographic information systems (GIS) is obvious. Just compare a long table of crime statistics to an interactive map that graphically displays crime patterns, neatly color-coded according to the type or time of the crimes.
 
In a recent article, GCN reports the advantages of mapped data haven't been lost on government agencies at the local, state and federal levels, which have developed GIS capabilities for a vast array of uses. For example, San Francisco's Bureau of Urban Forestry has developed a Web application for tracking the planting of new trees. Many states and counties employ GIS applications to monitor traffic flow and dispatch repair and maintenance personnel. And first responders at all levels of government are using GIS applications to help them respond more quickly and effectively.
 
However, as powerful as they are, most GIS applications developed during the past decade were created in isolation from one another. Because developers created the applications with different programming tools and the applications tap different geospatial engines and databases, it has often been difficult or impossible for one agency to access data collected by another agency. For example, federal emergency responders might not be able to access a city's GIS data on locations of fire hydrants or sites that contain hazardous materials.
 

To read more of GCN's GIS article, select here...

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  bdpatoday 
 Acronym of the Day
GIS
                     
What is GIS?
 
A GIS (geographic information system) enables you to envision the geographic aspects of a body of data. Basically, it lets you query or analyze a database and receive the results in the form of some kind of map. Since many kinds of data have important geographic aspects, a GIS can have many uses: weather forecasting, sales analysis, population forecasting, and land use planning, to name a few.
 
In a GIS, geographic information is described explicitly in terms of geographic coordinates (latitude and longitude or some national grid coordinates) or implicitly in terms of a street address, postal code, or forest stand identifier. A geographic information system contains the ability to translate implicit geographic data (such as a street address) into an explicit map location. GIS developers sometimes obtain the map data from public sources or companies that specialize in collecting and organizing geographic information. The process of converting implicit geographic data into explicit or map-form images is called geocoding.
 
Geographic data can be stored in a vector graphics or a raster graphics format. Using a vector format, two-dimensional data is stored in terms of x and y coordinates. A road or a river can be described as a series of x,y coordinate points. Nonlinear features such as town boundaries can be stored as a closed loop of coordinates. The vector model is good for describing well-delineated features. A raster data format expresses data as a continuously-changing set of grid cells. The raster model is better for portraying subtle changes such as soil type patterns over an area. Most geographic information systems make use of both kinds of data.
 
GIS applications do any or all of the following:
  • They accept geographic input in the form of scanned-in and digitized map images. Often this data is supplied by a source that may own maps and has already digitized them.
  • They rescale or otherwise manipulate geographic data for different purposes.
  • They include a database manager, usually a relational database management system (RDBMS).
  • They include query and analysis programs so that you can retrieve answers to simple questions such as the distance between two points on a map or more complicated questions that require analysis, such as determining the traffic pattern at a given intersection.
  • They provide answers visually, usually as maps or graphs.
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