Figure 4. Oregon Geologic
Data Compilation (OGDC) Access database relationships and tables can be difficult to navigate.
need a geology degree to make a symbolically correct geologic map. The representations symbolize all the features based on codes in the attribute table. Adding feature attribution with FGDC codes to the data-creation cycle simplifies geologic map creation.
A Better and Improving System The Oregon Department of Geology and Mineral Industries advanced its geologic data creation and map-production process by using a custom-built file geodatabase, new LIDAR basemaps, a new data- creation methodology and cartographic representa- tions. Migrating to this format enabled the creation of clean data and streamlined data-attribution and map-creation processes. In addition, GIS staff who need to drill up and down
through complex attribute tables no longer need Microsoft Access. And DOGAMI uses a file geodata- base format that has all the core USGS components with a coded attribute structure that follows the FGDC Digital Cartographic Standard for Geologic Map Symbolization. DOGAMI currently is refining the data- base maintenance and update methodology, and it plans to release a new digital version of OGDC by the end of 2012.
Figure 5. A geologic map was created
using DOGAMI's new production process. The geodatabase behind the map can be updated quickly and efficiently, and data can be added seamlessly to the OGDC statewide compilation.
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Rachel Lyles Smith is the project operations and
GIS program manager for the Oregon Department of Geology and Mineral Industries, Portland, Ore.; e-mail: rachel.lyles@dogami.state.or.us.
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