Montana Spatial Data Infrastructure (MSDI)

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.com 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 (free), monitor the Clearinghouse home page news feed, and connect with us via Facebook. Direct questions about a specific web map service to the respective MSDI theme steward/lead.
  • ArcGIS Desktop Users may use this URL -- http://gisservicemt.gov/ArcGIS/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.
  • Web Mercator projection:  Many of 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

  • Address Geocoder:  This service allows you to convert street addresses into geographic coordinates (i.e. Latitude/Longitude).
  • Managed Areas:  This shows public and private Managed Areas and information on special land designations. The service is in Web Mercator coordinates - ArcGIS desktop users should set their data frame coordinate system to Montana State Plane coordinates before using this service.
  • Montana 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. The service is in Web Mercator coordinates - ArcGIS desktop users should set their data frame coordinate system to Montana State Plane coordinates before using this service.
  • Montana 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. The service is in Web Mercator coordinates - ArcGIS desktop users should set their data frame coordinate system to Montana State Plane coordinates before using this service.
  • 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. The image mosaic is in the Web Mercator Auxilliary Sphere coordinate system.
  • 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. The service is in the Web Mercator Auxilliary Sphere coordinate system.
  • 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.