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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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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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