Vector Data Input Chapter 4. Data Buy or make - sources Base map - layers Standards – accuracy Metadata As bad as the worst component.

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Presentation transcript:

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 geodetic control, orthoimagery, elevation, transportation, hydrography, governmental information, cadastral.

Existing GIS Data US Public Data US Geological Survey US Bureau of the Census State Public Data Regional Public Data (Central TX) Regional Public Data Metropolitan Public Data (Austin) Metropolitan Public Data GIS Data from Private Companies

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 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 See Appendix C of text Texas Natural Resources Information System (TNRIS) Texas Natural Resources Information System (TNRIS) Texas Wetland Information Network (WetNet) Texas Natural Resource Conservation Commission Texas Natural Resource Conservation Commission Texas Parks and Wildlife Department Texas Environmental Awareness Network

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 ESRI Geographic Data Technology Library/Resources

Metadata Information about information Federal Standards Software to assist Federal Geographic Data Committee Example: Texas Parks & WildlifeTexas Parks & Wildlife

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) International Steering Committee for Global Mapping (ISCGM)

Remotely Sensed Data Digital orthophotos (DOQs) Satellite images

GPS Data Library/Resources Selective Availability Differential correction 3-5 meter

Digitizing inch accuracy Snap tolerances arcsnap nodestrap Intersect arcs Duplicate arcs On-screen or heads up digitizing

Scanning Raster!!! Coffee stains - notes Colors Digital Raster Graph (DRG) Vectorization of raster files Commercial maps

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)