6. Cadastral Data Transfer Profile Utilizing SDTS

Intended Use --

The Cadastral Data Transfer Profile will support the vendor-neutral transfer of cadastral data that complies with the FGDC Cadastral Data Content Standard. This profile will accommodate survey data from the Bureau of Land Management (BLM) Automated Land and Mineral Records System (ALMRS). The Cadastral Data Transfer Profile is not strictly a new profile of SDTS, but is a mechanism for the exchange of cadastral information using a combination of SDTS and three other FGDC standards. Developers hope to take advantage of the existing Topological Vector Profile (TVP) of SDTS, with some consideration for the new Point Profile.

Primary Sponsors, Interested Groups, and Contacts --

The FGDC Cadastral Subcommittee and BLM are the primary sponsors and coordinators for this profile. TRW is also involved in the activity through BLM. Information on the Cadastral Subcommittee efforts toward Cadastral standards is available through the main FGDC web site

http://www.fgdc.gov

Future Plans --

Work on the Cadastral Data Transfer Standard was placed on hold until completion of the Content Standard for Cadastral Data. The Content Standard for Cadastral Data now has formal FGDC endorsement.

The Content Standard includes circular curves and other curves with constantly changing direction. These curves are supported in SDTS as "arcs," and are options in the current TVP but require redundant coding as lines in a TVP transfer. This means that decoders that do not support arcs would still be able to decode the information using the redundant lines. This is one of several issues for developers of the Cadastral Data Transfer Profile.

More information will be available after the September 1997 SDTS workshop presentations by individuals from BLM and TRW.