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GIS/GPS

Test One

QuestionAnswer
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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