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Database Management: Tables - page 25 / 35

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1/23/2015  UT Dallas

POEC 6382 Applied GIS Software

25

Coverage Generation

You can generate a new coverage from any comma-delimited ascii file that contains a unique identification number (will become the <cover>-id variable, or user-id) and coordinate pairs for points, lines, or polygons.

Prior to creating a coverage, determine if you would like single precision (coordinate accuracy to 3 decimals for geographic decimal degree) or double precision (coordinate accuracy to 6 decimals)

EXAMPLE FOR POINTS:

Arc:precision double

Arc:  generate airports

Generate: input airports.gen

Generate:points

Generate: quit

Arc:

Remember to build topology after creation of a new coverage

Arc: build  airports  point

Coverages are covered in more detail in the “Coverage” lecture!

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