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Teton County GIS Data Overview
This "Data Overview" is written primarily for the Teton County staff, and secondarily for the public. Not all of the data discussed in the page is distributed to the public from the Teton County web site. Public distribution of the data is divided into three categories:
Land Ownership, Parcel Boundaries, Easements,
Public Land Survey System Most of the property on the Join layer is represented as polygons, however, condominiums and some townhomes are shown with point symbols: either circles or squares. Circles represent approximate locations, squares represent accurate locations. Circles are used to represent individual condominium units within a condominium plat, but the order or relationship between the circles does not necessarily reflect the actual layout on the ground. Squares represent the actual location of a townhouse unit on the ground.
Easements shown on the easement table are primarily road easements. Levee easements are shown some pathway easements are shown, utility easements are NOT shown. TableStructure.html provides detailed information about the attribute data.
The Public Land Survey System is shown on three different layers: PLS - this is the most detailed layer; it shows section lines, quarter section lines, some 1/16th section lines, GLO lot lines, HES lines, and meander lines. This layer also has relevant annotations. TableStructure.html provides detailed information about the attribute data. The Teton County Land Use Districts and Zoning Overlays are in the County folder and named "Zoning" and "Zoverlay", respectively. The Town of Jackson Land Use Districts and Zoning Overlays are also in the County folder and named "TOJ_Zoning", and "TOJ_Zoning_Overlay", respectively. However, the easiest way to view these layer is to click Thematically Map County Zoning or Thematically Map Town Zoning from the Map pull-down menu. You can not show both county and town zoning at the same time.
Five organizations in Teton County hold conservation easements: The Jackson Hole Land Trust, The Nature Conservancy, Teton County Scenic Preserve Trust, U.S.A. (Department of Agriculture - Forest Service) and the National Fish & Wildlife Foundation. The GIS layers showing the easements held by each of these organizations are all in the County\ConservationEasements folder and are named JHLT_Protected_Properties, NatureConserv, TCSPT, USA, and Fish&Wildlife respectively. These layers are not a part of any of the standard workspaces, so they must be opened manually. These layers are publicly distributed from the Teton County web site. Aerial Photography and Digital Ortho Quads All of the aerial photography is in the Aerial_Photos folder and sub-folders, which are named by year. The initial Teton County aerial photography was done in 1999 and covered most of the privately owned land from Hoback Junction to Moose, and Alta. Updates have been done in 2001, 2003, and 2005. Each pixel in the images represents approximately one square foot on the ground. Black and White aerial photography of the Town of Jackson was produced in 1998, and color photography in 2003 and 2005. The Town of Jackson imagery is at a 0.5 foot / pixel resolution (each pixel represents approximately ½ square foot on the ground. The aerial photography layers are a part of the All, All60 and All_Plot MapInfo workspaces, and the web browser based GIS.
The individual aerial photography projects are also available separately. Teton County charges a $1,000 licensing fee to individuals who wish to use this data. A seamless layer of 1994 black & white aerial ortho-photography named Grayscale_Photos is a part of the standard workspaces. This imagery is at a lower resolution than the color imagery (1 meter versus 1 foot) but it covers the entire county, not just the privately owned lands. On the server, this layer is named doqq and the individual images are in the Aerial_Photos\1994_doqq_utm83-12_sid and Aerial_Photos\1994_doqq_wy83-wf_ecw folders. The DOQQs are publicly distributed at: http://wgiac.state.wy.us 
A 2001 county-wide infrared ortho-image produced by the National Agriculture Imagery Program (NAIP) is in the 2001_CIR folder. It is at a 1 meter / pixel resolution. 
True color 2002 ortho-imagery of Grand Teton National Park at a 1 meter / pixel resolution is in the 2002_GrandTeton folder. 
The TrafficZone table is in the "County" folder. The TrafficZone table is not currently on the County GIS data distribution page. If you need this layer, please email a request to gis@tetonwyo.org Scanned USGS quads are called Digital Raster Graphics (DRG). They are not opened as a part of the standard workspaces, but may be added to any map window. They reside in the DRG folder. You may wish to start by opening the Index table in the DRG folder to pick the DRG that covers the area you are interested in. The DRG folder also has a sub-folder named "Seamless" which has DRGs that have had their collar trimmed off and have been spliced together to form a single seamless table. Open the "All_TC_Quads"; use this table. This layer is easier to use, provided that you do not need any of the collar information.
The DRGs are publicly distributed at: http://wgiac.state.wy.us Digital Elevation Models (DEM) There are various ways in which topography and elevation are represented in a GIS. All of Teton County's 3-D data is in the "DEM" folder. Below are two of the DEMs of Jackson Hole - East and West Gros Ventre Buttes are in the middle.
Below the DEM folder is the "5_ft_contours" folder, which has elevation contours at 5 foot intervals for the area covered by the 1999 photogrammetry. The contour coverage is split into five regions: 39N, 40N, 41N, 42N, and Alta, which generally follow the townships. The attribute data associated with each contour includes the elevation, and is described in detail in TableStructure.html These contours are distributed to the public as a part of the photogrammetric product as described in the Introduction.
1 foot contours of the Town of Jackson (1998) and the commercial area of Teton Village (2001) are in the "5_ft_contours" folder Also under the DEM folder is the "Slopes" folder, which contains slope analysis. There are two categories of slope analysis:
Also under the DEM folder is the "VM" folder, which contains the Vertical Mapper grid files. Vertical Mapper is a MapInfo add-on, and is the program used to process 3-D data in MapInfo. Vertical Mapper provides tools for viewshed analysis and image draping, among other things. You have to have Vertical Mapper installed on your computer in order to work with this data. The "County" folder has two hydrographic tables "Water" and "Water24k", which show lakes, rivers, and creeks. Both tables are derived from USGS mapping; Water form 1:100,000 scale mapping, Water24k from 1:24,000 scale mapping. The two images below show the same area (the confluence of the Gros Ventre River with the Snake River) and illustrate the difference in detail between the two map scales.
Both tables have one attribute data field: the name of the water feature. National Wetlands Inventory (NWI) data is in the "County\NWI" folder. This data was developed by United States Fish and Wildlife Service from aerial photography. The data has very limited ground-truthing and is not a substitute for a wetland delineation. More information and public data download is available at http://www.nwi.fws.gov/ or the local Natural Resource Conservation Service office. NWI data near Crescent-H, overlaid on a USGS quadrangle.
Wildlife data is in the "County\Wildlife" folder. This data was originally developed by BIOTA Research and Consulting in 1990 under a Teton County contract and provided as a set of acetate overlays over 1:24,000 scale USGS quads. The University of Wyoming digitized the maps in 1997. There are nine separate tables described in Wildlife.htm along with notes from the University of Wyoming digitizing team. There are other versions and updates of this data, however, Teton County does not have these in a digital format at this time. Land Cover data is in the "County\Landcover" folder. The land cover layer (primarily vegetation) was developed by the Wyoming Gap Analysis Project. Derived from classified Landsat satellite imagery and field verification. The data was developed at a scale of 1:100,000, so it is fairly course compared to other Teton County data. Care should therefore be exercised when overlaying it with other, more accurate, layers. Additional metadata links: LandCover.htm and http://www.src.uwyo.edu/node/frmLand.html Generalized Bedrock geologic data is in the "County\Landcover\GeneralizedGeology" workspace. The data was developed in conjunction with the Wyoming Water Development Commission Level I Master Plan, described below.
An excellent place to look for Tetoc County Natural Hazards information is the www.BePreparedTC.com web site. This is a map-centric web site with useful information and links. Land Slide data developed by the Wyoming State Geologic Survey is in the "County\Geology\LandSlides" workspace.
Use the MapInfo FEMA workspace to view Federal Emergency Management Agency (FEMA) Flood Insurance Rate Map (FIRM) data. This data was developed by LandInfo and is a convienient way to view the fllod plain data. However, the FEMA FIRM panels are the only official maps. Scanned copies of the official FEMA FIRM panles can be viewed or downlaoded at www.tetonwyo.org/GIS/FEMA/. The Hot Link tool (aka the "Lightening Bolt") in the FEMA workspace will also link to these scanned maps.
Fire: Urban / Wildfire Interface fire evacuation areas are in the "County\Fire" folder. The data is in a single table named "Fire_Evacuation_Areas.tab" and there is also a workspace named "FireEvacuation.wor" Jackson Lake Dam Failure Inundation Areas: The Bureau of Reclamation modeled the areas that would be inundated by flood in the event of a failure of the Jackson Lake dam. The folder "County\Bureau_Reclamation" contains both a workspace, and a table which can be added to other workspaces, that shows the inundated area that was taken from the August 1980 U.S. Bureau of Reclamation Jackson Lake Dam inundation maps. Drawing numbers 17-100-451 thru 17-100-456. Note that "The inundated area shown on this map reflect events of an extremely remote nature. These results are not intended to reflect upon the integrity of Jackson Lake Dam." WWDC - Wyoming Water Development Commission The "County\WWDC" folder, and sub folders, contain complete data from the Wyoming Water Development Commission, Level -I, Teton County Master Plan prepared in 1998 by Jorgensen Engineering, et al. Please refer to the Read Me.doc Microsoft Word file in the County\WWDC folder, which gives a detailed overview of the contents of this folder. The data within this folder is not limited to GIS data. The folder is structured as follows:
The GIS folder includes 17 MapInfo workspaces that correspond to figures in the final report. Much of the GIS data is available elsewhere on this site; however, the Depth to Groundwater and Aquifer Sensitivity workspaces and associated data exist only in this folder. County\Infrastructure contains three MapInfo tables from the WWDC Master Plan described above.
Precincts Voting precincts and polling places are in the County\Precinct folder. The Precincts data is not currently on the County GIS data distribution page. If you need this layer, please email a request to gis@tetonwyo.org | ||||||||||||||||||
