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ENV510 Landscape Ecology and GIS
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Maintenance and
analysis of spatial data
These functions
are used to transform spatial data files, edit them and assess their accuracy.
- Format
transformations - the transformation of
files into the data structure and file formats used internally by the GIS
- Geometric
transformations - assigning of ground coordinates
to a data layer within the GIS of adjustment of one layer so it can be overlayed
correctly on another data layer for the same area (the procedure is called
registration)
- Conflation
- the procedure of reconciling the positions of corresponding features in
different data layers ie ensuring that features that have the same geographic
position will coincide when two data layers are overlayed
- Edge
matching and mosaicing
- a procedure to adjust the position of features that extend across map sheet
boundaries
- Editing
functions - used to add, delete ad change
the geographic position of features eg removal of sliver
polygons generated during digitising or overlay operations and line
snapping - extending short lines to reach features they should connect to
- Line
coordinate thinning - used to reduce the
quantity of coordinate data that must be stored in the GIS when more coordinates
are entered than needed (Aranoff,
1989)
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