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META TOPICPARENT |
name="DMM.AprilWebster" |
File Formats for GIS Data |
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- Required files:
- Main file: .shp
- This is the primary file that stores feature geometry.
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- "It's a direct access, variable-record-length file in which each record describes a shape with a list of its vertices." (ESRI)
- Stores integer and double-precision numbers (ESRI)
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- Index file: .shx
- Stores the index of the feature geometry.
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- "Each record contains the offset of the corresponding main file record from the beginning of the main file." (ESRI)
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- Stores the attribute data for features contained in .shp.
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- Stores the attribute data for features contained in .shp, with one record per feature.
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- There is a one-to-one relationship between geometry and attributes, which is based on record number. Attribute records in the dBASE file must be in the same order as records in the main file.
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- It is a mix of binary and ASCII data. Header contains binary data. The records are all in ASCII. (XBase)
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