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Collaborative Database Effort for Geology

Building a multi-map, multi-user GeMS database

The Alaska Division of Geological & Geophysical Surveys (DGGS) has undertaken the challenge of developing a multi-map, multi-user database model based on the single-map Geologic Map Schema (GeMS) developed by the USGS and state geological surveys. The multi-map model is intended for national use. A multi-map geodatabase will help DGGS meet the future goal of a 1:100,000-scale Alaska compilation, and provide a vehicle for other geologic surveys and agencies to organize and share their own geologic data. DGGS is seeking interested individuals to take part in discussions via teleconferences to provide input on the needs of geologic surveys and other organizations, help develop the specifications of the database model, and share ideas to help the community.

Telecons or Webex will usually be held the 2nd Monday of the month. The next meeting is scheduled for Monday, December 13, 2021, 2pm ET.


  • Introductions and comments
  • Presentation: Examples and solutions for working with hierarchy keys in the DMU, particularly for maps with regions and subregions: Kenzie Turner, Kathleen Warrell, and Evan Thoms, USGS; December 13
  • Ad hoc questions as time allows
  • Topics for future meetings - Looking for presenters
    • Quality Control and Using Data Reviewer for GeMS validation: Mike Hendricks, AK DGGS; January 10
    • Efficient methodologies for heads-up digitizing and GeMS attribution: Tracey Felger, USGS; date?
    • NRCan's image database schema and exif header metadata: Étienne Girard, NRCan; date?
    • ArcGIS Pro Tasks: Esri?
    • Others?
  • Next meeting date is January 10, 2022. See above for topic.

Table of Contents, Alaska Division of Geological & Geophysical Surveys