Geographic Coordinate DataBase What Where How Fred Wheeler Cadastral Surveyor Central Valley Chapter – CLSA April 25, 2012 Bureau of Land Management GCDB

Geographic Coordinate Data Base What Makes Up a GCDB? Why is a GCDB needed?

What is the GCDB? A seamless network of Survey and Land Description records. Provides increased GIS accuracies for the PLSS corners. Provides basis for integration of additional Survey and Land records for defining other parcels Base for the CadNSDI - Land Information System

Public Land Surveys System Public Land Surveys System Land and Mineral Records Land and Mineral Records Resource Data Resource Data

Data Collection GMM and PCCS Flat Files – NAD 1927

Data Collection NILS DataBase – NAD 1983

Flat files or Database Federal Records State/Local Private Records Other

Data Collection GCDB data collection has created ASCII flat files using BLM developed software. –PCCS –GMM GeoCommunicator is the public website for publication of the BLM and FS Land Records. (

Uses for the GCDB data It can be used to improve the positional accuracies of GIS data Surveyors and land managers can use coordinates to search for property corner monuments Land managers can use data to plan for land uses.

Where to get the GCDB. GMM and PCCS data – dbpage.htmlhttp:// dbpage.html –ftp://ftp.blm.gov/pub/CA/gcdbftp://ftp.blm.gov/pub/CA/gcdb –See the gcdbread.txt & caluser.doc for info GeoCommunicator –

GeoCommunicator

GeoCommunicator the Data Publication Website

Land and Minerals Use

Land Survey Information System

Need more Information? Contact the GCDB staff at: Bureau of Land Management Branch of Geographic Services, GCDB Section 2800 Cottage Way Sacramento, CA Or Phone: (916)