gus: 0262 fundamentals of gis lecture presentation 8: data input and editing jeremy mennis...
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![Page 1: GUS: 0262 Fundamentals of GIS Lecture Presentation 8: Data Input and Editing Jeremy Mennis Department of Geography and Urban Studies Temple University](https://reader035.vdocuments.net/reader035/viewer/2022081519/56649efa5503460f94c0c0bb/html5/thumbnails/1.jpg)
GUS: 0262Fundamentals of GIS
Lecture Presentation 8:
Data Input and Editing
Jeremy Mennis
Department of Geography and Urban Studies
Temple University
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Raster Data Input
1. Vector to Raster Conversion
2. Scanned Graphics
3. Classified Remotely Sensed Imagery
4. Interpolation from Point Data
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Raster to Vector Conversion
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Scanned Graphics
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Classified RS Imagery
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Interpolation from Point Data
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Vector Data Input
1. Raster to Vector Conversion
2. Scanned Graphics (Scan Digitizing)
3. Data Collection from the Field
4. Manual Vector Digitizing
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Scanned Graphics (Scan Digitizing)
1. Drum scanner scans in map image
2. Specialized software ‘extracts’ point, line, and area features
3. Very expensive and susceptible to errors when map is ‘dirty’
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Field Data Collection
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Field Data Collection
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Manual Vector Digitizing Tablet
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Manual Vector Digitizing Puck
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Manual Vector Digitizing
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1. Prepare map sheet
2. Digitize the coverage
3. Identify and correct digitizing errors
4. Build topology
5. Identify and correct topology errors
6. Assign attributes
7. Identify and correct attribute errors
Manual Vector Digitizing Process
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Manual Vector Digitizing Preparation
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1. Map quality?
2. Separations?
3. Folds and wrinkles in the map?
4. Transfer to mylar ?
Manual Vector Digitizing Preparation
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Manual Vector Digitizing Registration
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Manual Vector Digitizing Process
1. Fuzzy tolerance.
2. Try to capture the necessary accuracy with minimum number of data points.
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Vector Data Editing
Vector digitizing errors
1. entity error (positional error)
2. attribute error
3. entity-attribute error
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Undershoots/Overshoots
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Weird Polygons
Missing node
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Pseudonodes
pseudonode
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Polygon Label Errors
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Sliver Polygons
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Edge Matching