1. Introduction to GIS Lecture 18: Public Data 2: Other Public Data Sources Lecture notes by Austin Troy, University of Vermont © 2006 ------Using GIS--

2. Introduction to GIS ©2006 Austin Troy Comes from both the USGS and the EPA Surface water features: lakes, ponds, streams, rivers, springs Nationally consistent Order of linkages coded to allow for flow path analysis Background info at http://nhd.usgs.gov/techref.html http://nhd.usgs.gov/techref.html Resolutions from 1:100k to 1:24k National Hydrography Dataset (NHD)

3. Introduction to GIS ©2006 Austin Troy NHD Many analysis tools designed for this data. For instance: can find the path upstream or downstream from any point using NHD data and network analyst; flow reaches are numbered sequentially in order of flow to allow path analysis Stream reaches encoded like addresses on a street Connections encoded using topology Other tools available at http://nhd.usgs.gov/tools.html http://nhd.usgs.gov/tools.html

4. Introduction to GIS ©2006 Austin Troy NHD Download at http://nhd.usgs.gov/tools.htmlhttp://nhd.usgs.gov/tools.html

5. Introduction to GIS ©2006 Austin Troy NHD Can extract by County/state. Click on radio button of geography for clip Use check marks to make layers visible in base map Then Click on clip boundary (e.g. Chittenden County) in the map viewer

6. Introduction to GIS ©2006 Austin Troy NHD Can then choose the resolution and the database type Must turn popup blocker off to use Then get an email for custom download

7. Introduction to GIS ©2006 Austin Troy NHD Contents of Geodatabase: many feature classes with different purposes

8. Introduction to GIS ©2006 Austin Troy USDA Data USDA houses a number of data layers at their new Geospatial data gateway http://datagateway. nrcs.usda.gov/http://datagateway. nrcs.usda.gov/

9. Introduction to GIS ©2006 Austin Troy USDA Gateway Includes CLU farm boundaries Hydrologic Units (8 and 12 digit) Digital Raster Graphics High resolution color orthophotos from 2003-2004 (National Agriculatural Imagery Program) NRCS Soils data and soils tables Climate Data (precipitation and temp)

10. Introduction to GIS ©2006 Austin Troy USDA Gateway Includes

11. Introduction to GIS ©2006 Austin Troy USDA Gateway Includes Can Define clip regions by state or county Can also highlight a layer and get information

12. Introduction to GIS ©2006 Austin Troy Common Land Units Farm field boundaries representing smallest contiguous unit of cultivated land For farms in USDA programs Much more accurate that “agriculture” category in NLCD land cover Type of crop is unknown

13. Introduction to GIS ©2006 Austin Troy NAIP National Agricultural Imagery Program Digital Imagery, mosaiced by county, used by the NRCS and FSA to look at compliance with subsidy programs Ortho-rectified, Color, 1:40,000 scale 2003 and 2004

14. Introduction to GIS ©2006 Austin Troy SSURGO Soils Data SSURGO: Soil Survey Geographic Data from NRCS Soils data also at http://soildatamart.nrcs.usda.gov/ Default.aspx http://soildatamart.nrcs.usda.gov/ Default.aspx Metadata and standards available at http://soildatamart.nrcs.usda.gov/S SURGOMetadata.aspx http://soildatamart.nrcs.usda.gov/S SURGOMetadata.aspx Entails both a polygon layer showing soils area boundaries, but also an Access Database of numerous soil attributes

15. Introduction to GIS ©2006 Austin Troy National Wetlands Inventory From Fish and Wildlife Service Maps all class 1 and 2 major wetlands Available digitally for much of the country 1:24,000 or smaller Involves a complex taxonomy of wetlands codes available at http://nwi.fws.gov/MapCodesLegend.pdf http://nwi.fws.gov/MapCodesLegend.pdf Includes marine, estuarine, riverine, lacustrine and palustrine types

16. Introduction to GIS ©2006 Austin Troy NWI Wetlands map interface at http://wetlandsfws.er.usgs.gov/wtlnds/launch.html http://wetlandsfws.er.usgs.gov/wtlnds/launch.html Allows you to view online data and download First shows status availability map:

17. Introduction to GIS ©2006 Austin Troy NWI Can make PDFs easily

18. Introduction to GIS ©2006 Austin Troy NWI NWI by wetland type overlaid on NHD streams layer

19. Introduction to GIS ©2006 Austin Troy SSURGO Soil Data Mart interface Access—sample tables; there are dozens

20. Introduction to GIS ©2006 Austin Troy Topologically Integrated Geographic Encoding and Reference System Automates the mapping and related geographic activities required to support the decennial census and sample survey programs of the census bureau starting with the 1990 decennial census. The Census TIGER ® system supports: Creation and maintenance of the digital geographic data base that includes complete coverage of the United States and its territories TIGER

21. Introduction to GIS ©2006 Austin Troy The TIGER system provides support for: Creation and maintenance of a nation wide digital geographic data base Production of maps from the TIGER ® data base for all Census Bureau enumeration and publication programs Allows for address geocoding Can be integrated with Census attribute databases easily

22. Introduction to GIS ©2006 Austin Troy Accuracy and Attribution: TIGER has good attribution, but poor accuracy They are based partially on 1:100,000 DLG Are often conflated This is often used to assign the attributes from TIGER ® data to 1:24,000 DLG data

23. Introduction to GIS ©2006 Austin Troy The TIGER files contain data describing three feature types: Line Features 1.Roads 2.Railroads 3.Hydrography 4.Transportation and Utility Lines Boundary Features 1.Statistical boundaries, such as census tracts and blocks 2.Local government boundaries, such as places and counties 3.Administrative boundaries, such as congressional and school districts Landmark Features 1.Point landmarks, such as schools and churches 2.Area landmarks, such as parks and cemeteries 3.Key geographic locations, such as apartment buildings and factories

24. Introduction to GIS ©2006 Austin Troy TIGER line files and the demographic files Direct linkage using keys built up from: State FIPS code County FIPS code Tract number Block group number Block number

25. Introduction to GIS ©2006 Austin Troy Best sources ESRI: http://www.esri.com/data/download/census2000_tigerline/index.html Download 2000 U.S. Census TIGER lines files and demographic data Other Sources: UC Davis government data server: http://www.lib.ucdavis.edu/govdoc/MapCollection/tiger.html Or UC Berkeley Tiger Server: http://sunsite.Berkeley.EDU/GovData/info/tiger.html

26. Introduction to GIS ©2006 Austin Troy

27. Introduction to GIS ©2006 Austin Troy

28. Introduction to GIS ©2006 Austin Troy Introduction to GIS

29. ©2006 Austin Troy For continuing data updates, check the data links page at http://www.uvm.edu/~nr143/supplement.html http://www.uvm.edu/~nr143/supplement.html Here you’ll find links to many state level GIS online data repositories plus many of the ones mentioned here Another link is to map a network drive to \\zoofiles\gisdata where you’ll find: NAIP imagery, ortho photos, all VCGI data plus VTrans database, World data from ESRI, DRG topo maps, Street maps USA

30. Introduction to GIS ©2006 Austin Troy Other sources for USGS data www.mapmart.com –Allows users to choose tiles and layers with a geographic interface –Most public data are free, but,any others available for a price –Gives status maps –Can also buy bulk public data for a fee www.gisdatadepot.com –Not as user friendly –Just a plain old interface that is hard to navigate –However, many free data layers and lots of scripts and extensions

31. Introduction to GIS ©2006 Austin Troy VCGI The web site offers many layers through a browser

32. Introduction to GIS ©2006 Austin Troy Includes an interactive map browser for “clipping and zipping” data