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Identify - GIS and Mapping - Lecture Notes, Study notes of Geology

Aligarh Muslim UniversityGeology

In these Lecture notes, the following main points were discussed by the Lecturer : Identify, Geometric Intersection, Input Coverage, Output Coverage, Spatial Analysis, Faultzone, Polygon, Clipping And Erasing, Spatial Matching, Polygon Overlay

Typology: Study notes

2012/2013

Uploaded on 07/23/2013

ramkumar
ramkumar 🇮🇳

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31
IDENTITY
•IDENTITY - computes the geometric intersection of two
coverages. All features of the input coverage, as well as those
features of the identity coverage that overlap the input coverage,
are preserved in the output coverage.
•IDENTITY <in_cover> <identity_cover> <out_cover> {POLY |
LINE | POINT} {fuzzy_tolerance} {JOIN | NOJOIN}
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31

IDENTITY

  • IDENTITY - computes the geometric intersection of two coverages. All features of the input coverage, as well as those features of the identity coverage that overlap the input coverage, are preserved in the output coverage.
  • IDENTITY <in_cover> <identity_cover> <out_cover> {POLY | LINE | POINT} {fuzzy_tolerance} {JOIN | NOJOIN}

32

IDENTITY, Page 2

34

Typical Steps in Spatial Analysis

  • Establish analysis objectives and criteria
  • Prepare data for spatial operations
  • Perform spatial operations
  • Prepare derived data for tabular analysis
  • Perform tabular analysis
  • Evaluate and interpret results
  • Refine the analysis as necessary
  • Produce final maps and tabular reports of the results

35

Spatial Analysis Example, page 1

  • Your firm has been contracted to identify sites that are suitable for a landfill. An ideal site would meet the following criteria: - At least 1/4 mile from any local street - Soil suitable for landfill development - Zoned industrial or agricultural - Vacant or agricultural land use - Not prone to flooding - Not within a fault zone - Area greater than 1,400,000 square feet
  • Coverages available:
      1. streets 4. landuse
      1. soil 5. flood
      1. zoning 6. faultzone

37

Spatial Analysis Example

  • Identify suitable sites (from 6 possible locations) for a branch bank: - more than 10,000 population within 2 miles - no other bank within 1 mile - on a parcel adjacent to a major thoroughfare
  • Available coverages:
    • 6parcels
    • census
    • banks
    • roads

38

Spatial Analysis Example

  • Design a sensitive habitat preservation zone for the purple-throated tutsi bird (very rare), which needs: - grassland, area over 1,000 acres - adjacent to forest, area over 500 acres - no major road within 5 miles.
  • What data do I need?

40 Example: Spatial Matching via Polygon-on-Polygon Overlay: Union Drainage Basins The two themes (land use & drainage basins) do not have common boundaries. GIS creates combined layer with all possible combinations, permitting calculation of land use by drainage basin. a. (^) b. c. aG aA bA bG cA cG Land Use A. G. Atlantic Gulf Combined layer