Geography Lesson

Páginas: 2 (393 palabras) Publicado: 2 de septiembre de 2011
What is GIS?
A geographic information system (GIS) integrates hardware, software, and data for capturing, managing, analyzing, and displaying all forms of geographically referenced information.
GISallows us to view, understand, question, interpret, and visualize data in many ways that reveal relationships, patterns, and trends in the form of maps, globes, reports, and charts.
A GIS helps youanswer questions and solve problems by looking at your data in a way that is quickly understood and easily shared.
GIS technology can be integrated into any enterprise information system framework.Map Where Things Are
Mapping where things are lets you find places that have the features you're looking for and to see patterns.
Map Quantities
People map quantities to find places that meet theircriteria and take action. A children's clothing company might want to find ZIP Codes with many young families with relatively high income. Public health officials might want to map the numbers ofphysicians per 1,000 people in each census tract to identify which areas are adequately served, and which are not.
Map Densities
A density map lets you measure the number of features using a uniformareal unit so you can clearly see the distribution. This is especially useful when mapping areas, such as census tracts or counties, which vary greatly in size. On maps showing the number of people percensus tract, the larger tracts might have more people than smaller ones. But some smaller tracts might have more people per square mile—a higher density.
Find What's Inside
Use GIS to monitorwhat's happening and to take specific action by mapping what's inside a specific area. For example, a district attorney would monitor drug-related arrests to find out if an arrest is within 1,000 feet of aschool--if so, stiffer penalties apply.
Find What's Nearby
GIS can hrelp you find out what's occurring within a set distance of a feature by mapping what's nearby.
Map Change
Map the change in...
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