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Vector Data Input. Chapter 4. Data. Buy or make - sources Base map - layers Standards – accuracy Metadata As bad as the worst component. Existing GIS Data. Federal Government Internet State Agencies Regional and local Framework data

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Presentation Transcript
slide2
Data
  • Buy or make - sources
  • Base map - layers
  • Standards – accuracy
  • Metadata
  • As bad as the worst component
existing gis data
Existing GIS Data
  • Federal Government
  • Internet
  • State Agencies
  • Regional and local
  • Framework data
    • geodetic control, orthoimagery, elevation, transportation, hydrography, governmental information, cadastral.
existing gis data1
Existing GIS Data
  • US Public Data
  • US Geological Survey
  • US Bureau of the Census
  • State Public Data
  • Regional Public Data (Central TX)
  • Metropolitan Public Data (Austin)
  • GIS Data from Private Companies
us geological survey
US Geological Survey
  • National mapping and remotely sensed
  • Thematic data clearinghouse
  • Digital Line Graphs created from USGS quadrangles.
  • 1:24,000; 1:100,000; 1:2,000,000
  • Hypsography (contour lines and spot elevations); hydrography, boundaries, transportation, PLSS data.
  • Land Use Land Cover (LULC) - Anderson
us bureau of census
US Bureau of Census
  • TIGER – Topologically Integrated Geographic Encoding and Referencing
  • Each census.
  • Address geocoding
  • Legal and statistical (zip, census block) to link to census data
  • Roads, railroads, streams, water bodies, power lines and pipelines.
statewide public data
Statewide Public Data
  • See Appendix C of text
  • Texas Natural Resources Information System (TNRIS)
  • Texas Wetland Information Network (WetNet)
  • Texas Natural Resource Conservation Commission
  • Texas Parks and Wildlife Department
  • Texas Environmental Awareness Network
regional and local public data
Regional and Local Public Data
  • University of Texas at Austin
    • College of Architecture
      • Community and Regional Planning
      • Austin and Central Texas
gis data from private companies
GIS Data fromPrivate Companies
  • ESRI
  • Geographic Data Technology
  • Library/Resources
metadata
Metadata
  • Information about information
  • Federal Standards
  • Software to assist
  • Federal Geographic Data Committee
  • Example: Texas Parks & Wildlife
conversion of existing data
Conversion of Existing Data
  • Direct translation
    • Arc/Info interchange files (.e00)
    • MGE and Microstation (.dgn)
    • AutoCAD (.dxf, .dwg)
    • shapefiles
  • Neutral format
    • Spatial Data Transfer Standard (SDTS)
    • Topological Vector Profile (TVP)
  • International Steering Committee for Global Mapping (ISCGM)
remotely sensed data
Remotely Sensed Data
  • Digital orthophotos (DOQs)
  • Satellite images
gps data
GPS Data
  • Library/Resources
  • Selective Availability
  • Differential correction
  • 3-5 meter
digitizing
Digitizing
  • 0.001 inch accuracy
  • Snap tolerances
    • arcsnap
    • nodestrap
  • Intersect arcs
  • Duplicate arcs
  • On-screen or heads up digitizing
scanning
Scanning
  • Raster!!!
  • Coffee stains - notes
  • Colors
  • Digital Raster Graph (DRG)
  • Vectorization of raster files
  • Commercial maps
geometric transformation
Geometric Transformation
  • Converting a digital map or an image from one coordinate system to another using a set of control points and transformation equations.
  • Different methods.
  • We won’t cover directly.
  • Root Mean Square Error (RMS)
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