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1 Practice: Montana ArcGIS Online
Subject Area: GDC
State: Montana
Organization: Montana Department of Transportation
Contact: Brian Andersen
Title: Lead GIS Analyst / Cartographer
Email: Brandersen@mt.gov
Description: MDT ArcGIS Online is a data portal that provides a common access point for both internal and external users (including the public and MDT's partner agencies) to access, visualize, and share MDT's geospatial data. The site contains a variety of mapping applications as well as MDT and publicly accessible data on environmental features, transportation infrastructure, corridor studies, and other transportation-related elements.
Related Documentation: https://mdt.maps.arcgis.com/home/index.html
   
2 Practice: Montana Cadastral Mapping Project
Subject Areas: Operations
Planning
State: Montana
Organization: Montana Information Technology Services Division
Contact: Stewart  Kirkpatrick
Title: State GIS Coordinator
Phone: 406-444-9013; 406-444-1255
Description: Cadastral data is a framework of property boundaries along with associated land ownership information (who owns what and where). The goals of the the Montana Cadastral Mapping Project are to produce and maintain cadastral information in a consistent, digital format for the entire State of Montana. In the interest of efficiency, the Montana Cadastral Mapping Project is using existing data, personnel, and funding resources whenever available. Montana is largely a rural state with a small percentage of its lands being subdivided, leaving a large percentage of land in aliquot parts. An aliquot is the basic unit of land in the Public Land Survey System, denoting a parcel of land one mile square in extent or 640 acres. Because aliquot parts are a mathematical subdivision of larger parcels into smaller equally-sized smaller parcels, it is possible to possible to create ownership parcels in an automated manner, if the supporting data exists.

Two pieces of information utilized by the Montana Cadastral Mapping Project are required to create aliquot part parcels:

1) legal land descriptions defining the aliquot parts to plot and
2) framework of coordinates defining the public land survey.

Both pieces of information exist, for most of the State of Montana, in a digital format. The existing databases are the Montana Department of Revenue Computer Assisted Mass Appraisal System (CAMA) database, and the U.S. Bureau of Land Management Geographic Coordinate Data Base (GCDB).
Related Documentation: http://svc.mt.gov/msl/mtcadastral
   
3 Practice: Montana Greater Yellowstone GIS Data: Transportation
State: Montana
Description: Montana State University's Big Sky Institute offers various GIS maps and roads of the Yellowstone region in Montana.
Related Documentation: https://www.yellowstonecountymt.gov/mapping/
   
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