Lec_1_Shapefile
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![Page 1: Lec_1_Shapefile](https://reader035.fdocuments.us/reader035/viewer/2022070316/55610027d8b42a91388b54df/html5/thumbnails/1.jpg)
Introduction to ShapefileProf. Dr. Sajid Rashid Ahmad
Atiqa Ijaz Khan _ Demonstrator
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Wednesday, April 12, 20233rd Prof. BS. Applied Geology, Inst. of Geology, University of the Punjab
2Shapefile
• “Shapefile is a simple, non-topological (No Neighborhood) format for storing the geometric locations/spatial features (associated with lat/long.) and attribute information of geographic features (features on Earth surface).”
• It can support: Point, Line, and Polygon.
• Geometry is stored as ‘Shape’ format.
• Attributes are stored in dBASE format file.
• They stored projection or coordinate system as ‘.prj’ format file.
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Wednesday, April 12, 20233rd Prof. BS. Applied Geology, Inst. of Geology, University of the Punjab
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Wednesday, April 12, 20233rd Prof. BS. Applied Geology, Inst. of Geology, University of the Punjab
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POINT
POLYGON
LINE
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Wednesday, April 12, 20233rd Prof. BS. Applied Geology, Inst. of Geology, University of the Punjab
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Wednesday, April 12, 20233rd Prof. BS. Applied Geology, Inst. of Geology, University of the Punjab
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Highlighted Features
Attribute Table
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Wednesday, April 12, 20233rd Prof. BS. Applied Geology, Inst. of Geology, University of the Punjab
7WHY shapefile?
• As it does not hold topology so it draws faster.
• It can be easily copied.
• Dose not required importing and exporting.
• Hold one-to-one relationship with spatial features.
• Supported by number of software.
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Wednesday, April 12, 20233rd Prof. BS. Applied Geology, Inst. of Geology, University of the Punjab
8Shapefile Extensions
• It consists of 3 core extensions:• Maine File (.shp)• Index File (.shx)• dBASE File (.dbf)
• And, 3 other extensions named as:• Projection File (.prj)• Spatial Index (.sbn)• Spatial Index (.sbx)
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Wednesday, April 12, 20233rd Prof. BS. Applied Geology, Inst. of Geology, University of the Punjab
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Wednesday, April 12, 20233rd Prof. BS. Applied Geology, Inst. of Geology, University of the Punjab
10Shapefile Requirements
• In order to create shapefile, following are the required parameters:• Type of Feature (point, line or polygon)• Coordinate system• 3-D values (Z-values)• Route values (M-values)
• These values are define at first, and will not alter after that.!
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Wednesday, April 12, 20233rd Prof. BS. Applied Geology, Inst. of Geology, University of the Punjab
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