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GIS/GPS
Test One
| Question | Answer |
|---|---|
| What is GIS? | a computer-based system to aid in the collection, maintenance, storage, analysis, output, and distribution of spatial data and information |
| What are the components of GIS? | hardware, software, data, humans, organizational protocols |
| Summarize the two major reasons that push development of GIS. | SOCIETY - environmental problems are more complex; resources are limited. TECHNOLOGICAL - |
| How are discrete objects and continuous phenomena represented in GIS? | Discrete objects are represented by vector models. Phenomena is represented by raster models. |
| What do spatial and aspatial mean in GIS? Give an example of each. | Spatial data is tied to a specific place on Earth's surface using coordinates such as a address. Aspatial data is attributes such as color or depth. |
| What is georeferencing in GIS? | to establish an object in terms of coordinate systems |
| Describe the major difference between the two most commonly used data models. | Vector - an object based approach, best used to describe discrete objects. Raster - a field based model best used to describe spatial phenomena |
| Explain the vector method of geographic data representation. | |
| What are the three basic vector objects used in the vector data model? | Points, lines/arcs, and polygons |
| What is topology? | the particular field of geometry that is concerned with spatial relationships rather than rigid coordinates |
| In the vector model, how are vector features linked to their attributes? | topology |
| Explain the raster method of geographic date representation. | |
| In the raster model, how are raster features linked to their attributes? | |
| What are two advantages and two disadvantages of vector models? | ADVANTAGE: usually well-supported, precise DISADVANTAGE: complex, |
| What are two advantages and two disadvantages of raster models? | ADVANTAGE: simple, DISADVANTAGE: |
| What are four major considerations for data quality evaluation? | geometric accuracy, thematic accuracy, resolution, and precision |
| What is metadata and why is it important? | the data of data; |
| List four data files you can use in ArcGIS. | geodatabases, rasters, CAD files, layer files, |
Created by:
stoniertk28
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