u14-VECTOR GIS CAPABILITIES

# u14-VECTOR GIS CAPABILITIES - UNIT 14 - VECTOR GIS...

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Sheet1 Page 1 UNIT 14 - VECTOR GIS CAPABILITIES <toc.html#UNIT14> UNIT 14 - VECTOR GIS CAPABILITIES Compiled with assistance from Holly J. Dickinson, State University of New York at Buffalo ------------------------------------------------------------------------ For Information that Supplements the Contents of this Unit: Buffers: Distance Transformations <http://weber.u.washington.edu/~chrisman/G460/Lec11.html> (Chrisman/U of Washington) -- Graphics and information about: construction of buffers around points. Transformations Examples <http://weber.u.washington.edu/~chrisman/G460/Lec17.html> (Chrisman/U of Washington) -- Dasymetric mapping of population density transformations overlay Transformations Between Measurement Frameworks <http://weber.u.washington.edu/~chrisman/G460/Lec16.html> (Chrisman/U of Washington) -- Surface transformations transformations. ------------------------------------------------------------------------ * A. INTRODUCTION <#SEC14.1> * B. SIMPLE DISPLAY AND QUERY <#SEC14.2> o Display <#SEC14.2.1> o Standard Query Language (SQL) <#SEC14.2.2> o Boolean operators <#SEC14.2.3> o SQL extensions for spatial queries <#SEC14.2.4> * C. RECLASSIFY, DISSOLVE AND MERGE <#SEC14.3> o Steps <#SEC14.3.1> o Forestry example <#SEC14.3.2> o City zoning example <#SEC14.3.3> * D. TOPOLOGICAL OVERLAY <#SEC14.4> o Point in polygon <#SEC14.4.1> o Line on polygon <#SEC14.4.2> o Polygon on polygon ("Polygon overlay") <#SEC14.4.3> o Example <#SEC14.4.4> o Spurious polygons <#SEC14.4.5> * E. BUFFERING <#SEC14.5>

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Sheet1 Page 2 * REFERENCES <#SEC14.6> * EXAM AND DISCUSSION QUESTIONS <#SEC14.7> * NOTES <#SEC14.8> This unit would be illustrated well with a series of overlays of a real area which demonstrates the problems discussed here using simple examples. UNIT 14 - VECTOR GIS CAPABILITIES Compiled with assistance from Holly J. Dickinson, State University of New York at Buffalo A. INTRODUCTION <#OUT14.1> * analysis functions with vector GIS are not quite the same as with raster GIS o more operations deal with objects o measures such as area have to be calculated from coordinates of objects, instead of counting cells * some operations are more accurate o estimates of area based on polygons more accurate than counts of pixels o estimates of perimeter of polygon more accurate than counting pixel boundaries on the edge of a zone * some operations are slower o e.g. overlaying layers, finding buffers * some operations are faster o e.g. finding path through road network B. SIMPLE DISPLAY AND QUERY <#OUT14.2> Display <#OUT14.2.1> * using points and "arcs" can display the locations of all objects stored * attributes and entity types can be displayed by varying colors, line patterns and point symbols * may only want to display a subset of the data o e.g. want to display areas of urban landuse with some base map data + select all political boundaries and highways, but only areas that had urban land uses * how would the user do this?
Sheet1 Page 3 o e.g. one of the layers in a database is a "map" of land use,

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## This note was uploaded on 10/05/2010 for the course GEO 591 taught by Professor Davidm.mark during the Fall '10 term at SUNY Buffalo.

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u14-VECTOR GIS CAPABILITIES - UNIT 14 - VECTOR GIS...

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