Web Map Services

Web map services allow your applications to connect to and use on-line GIS datasets.  The State Library offers the services listed below.  Anyone may view the services in their web browser by clicking on the service names below and then choosing the ArcGIS Online Map Viewer link near the top of the service's home page.

  • Note: The presence of a map service, the data schema, and the data itself are subject to change as resources allow and the data or the service improves and is updated. To stay informed about changes to these web map services, join the MAGIP listserv or subscribe to the MSL news feed. Direct questions about a specific web map service to the respective MSDI Theme Steward.
  • ArcGIS Desktop Users may use this URL -- https://gisservicemt.gov/arcgis/rest/services/ -- in the "Add ArcGIS server" dialog box to access the main list of services.  You may also use the View In ArcMap link on the service home pages listed below to add the services to your map documents. See the ArcGIS Help for assistance with connecting to services from ArcMap. Or, ArcGIS Pro Help for assistance connecting to services in ArcGIS Pro.
  • Web Mercator projection:  Unless otherwise noted these services use the Web Mercator coordinate system, which facilitates their incorporation into web map applications.  Users of ArcMap must make sure that the coordinate systems of their data frames are never set to Web Mercator if they want to perform any kind of measurements.  Most web applications understand that the map scale varies as you move north and south in this coordinate system, but ArcMap mostly does not.  Measurements made in Montana will be from 40 percent to 100 percent too large if they are made using the Web Mercator projection.

Montana Spatial Data Infrastructure Services

Other Services

  • Montana Address Locator:  This service converts street addresses into geographic coordinates (i.e. Latitude/Longitude).
  • Geographic Names Locator: This service converts geographic names into coordinates.
  • State Mask:  This service may be used for covering map data that is not in selected states or provinces of North America or counties near Montana.
  • State Base Map:  This service may be used as a general base map and has a map data overlay group for imagery services. The emphasis is on public and private land ownership data.  It also shows the Public Land Survey System, lakes and streams, roads, and landforms.
  • Digital Orthophoto Quarter Quadrangle Data (DOQQ):  This is a mosaic of black and white orthorectified aerial photos of Montana and Yellowstone National Park taken predominantly in the 1990s. The mosaic footprint layer has an attribute field called Image_Year that gives the year the image was taken and a field called Image_Main_Date that gives the first date from the USGS metadata for the image.
  • Historic Imagery (Mid 20th Century): This image service is a mosaic of black and white historical aerial images from the USGS Single Frame Archive creating a continuous orthoimage for Montana. The imagery spans the 1940s to the 1970s. A web service of the Image Dates and Tile Index are also available for reference.  
  • Historic Topographic Maps:  These 1:24,000 and 1:100,000 scale topographic maps were the newest scanned maps available from the U.S. Geological Survey TopoView web site as of November 2015. The data include the maps covering Montana and parts of Idaho and northern Wyoming. The data provides a historical reference and because they contain hand-placed elevation and place names the information may not be available on newer maps. Users should be aware that significant changes may have occurred in the landscape since the maps were made as many of the maps are over 30 years old.
  • Frost Free DaysThis raster data can be used as a tool to determine growing season and suitability for certain crops. The data represent the spatial distribution of the number of days in which the daily minimum temperature is greater than 32 degrees Fahrenheit based on a 5 in 10 year probability.
  • Relative Effective Annual Precipitation (REAP): The Montana REAP data represents a 30-year precipitation data period sensitized to the landscape according to slope and aspect, then calibrated by soil scientists to known vegetation breaks on the landscape based on imagery, field experience, and published SSURGO/NASIS soils data.
  • Flathead Basin 2009 Orthophotos and Elevation:  This shows high-resolution air photos, infrared air photos, and elevation data collected for the northern Flathead valley and the shorelines of Flathead Lake in 2009. A web map of this service is available for easier access to the data for users not using GIS software.
  • Yellowstone River Hydrology:  This service shows data collected for the Yellowstone River Cumulative Effects Analysis, including the channel migration zone, historic locations of the river channel, man-made features that impact the flow of the river, and river miles. It also shows the river reaches designated for the analysis and aerial photos of the river made between 1948 and 1955. A web map of this service is available for easier access to the data for users not using GIS software.
  • Reference100k:   This service provides a static base map of Montana designed to be viewed at a scale of approximately 1:100,000. Data shown on the map includes public land ownership, selected federal and state managed areas, lakes, streams, roads, the Public Land Survey system, 50-foot contours, shaded relief, and selected buildings and structures. A cached version is also available.