GOMR Geographic Information System
(GIS) Data and Maps
The MMS Mapping & Boundary Branch performs
mathematical offshore boundary location computations and prepares Official
Protraction Diagrams (OPDs),
and Supplemental Official OCS Block Diagrams (SOBDs)
depicting OCS Block information, the Submerged Lands Act Boundary (aka - State
Seaward Boundary), Limit of "8(g) Zone", the Continental Shelf Boundary (CSB)
which marks the limit of U.S. jurisdiction for offshore mineral development, and
corresponding area measurements. For clarification of Acronyms, see
Codes and Abbreviations for Map/OPD/Area.
The analytical procedures employed and the
computer programs utilized to perform various offshore boundary geometric
computations are described in
OCS Report MMS 99-0006.
·
Gulf of Mexico Geographic Mapping Data
Geographic
mapping data available for free downloading includes cadastral, regulatory,
and resource features. Some of the numerous
files available include lease, block, and protraction polygons, fairways,
pipelines and platforms. Three formats are available for download:
ArcInfo, ASCII, and DXF.
·
Gulf of Mexico Lease Information
Periodically, the Minerals Management Service holds Oil and Gas Lease Sales in
the Gulf of Mexico (GOM). Recent sale maps with active leases can be found by
viewing the individual sale information that is listed on the navigation toolbar
to the left of the
Lease Sale page (e.g. Western Sale 204)
o
GOM Active Leases/Infrastructure
(updated January 2009)
(Visual 1 .pdf) (Visual
1 eps version)
This map displays active leases, oil and gas
structures, pipelines, area boundaries, lease term lines, oil refineries, supply
bases, crude oil terminals, and water depth in meters.
o
Western
and Central GOM Topographic Features Stipulation Map Package
(updated July 2008)
(BioStip.pdf)
These maps indicate
the areas affected by the Topographic features Stipulation.
For additional information regarding Biological Stipulations
questions may be directed to
James Sinclair at (504) 736-2789.
Gulf of Mexico OPD Images
A standard OPD is 1 degree in latitude by 2
degrees in longitude (at lower latitudes: 0 - 48 degrees). At higher latitudes
(48 - 75 degrees) such as Alaska and northern Washington, OPDs are 3 degrees
wide. OPD limits usually approximate the standard 1:250,000 scale U.S.
Geological Survey topographic map series. The OPDs are numbered using the
United Nations International Map of the World Numbering System. OPD names
usually coincide with standard topographic sheet names when diagrams include
land areas. OPD sheet names relate to land features, or to hydrographic
features contained within the limits of the diagram. Shoreline
planimetric detail is shown when it falls within the
limits of a diagram. Older OPDs were prepared on mylar
with manual cartographic methods and then scanned into Adobe .pdf files. Newer
OPDs were prepared electronically and converted to Arc Info .gra
files and Adobe .pdf files
Gulf of Mexico SOBD Images
A Supplemental Official OCS Block Diagram (SOBD)
is prepared for each block intersected by an offshore boundary (Submerged Lands
Act Boundary, Limit of "8(g) Zone", National Marine Sanctuaries, etc.). Note
that not all OPDs contain such boundaries, therefore
not all OPDs have SOBDs associated
with them. For the purpose of future Lease Sales, always be sure to use the
most recent version.
Image File Formats
The most current approved revision for each
Gulf of Mexico Region OPD and SOBD may be viewed and downloaded from the list
below. OPDs are offered in Adobe (.pdf) format. OPDs completed after 1996 are
also available in Arc/Info Graphics File (.gra)
format. SOBDs are available as Adobe (.pdf) files
that have been compressed with PKZIP. Free decompression utilities may be
downloaded
here. Adobe (.pdf) files may be viewed with the free
Adobe Acrobat reader.
GIS
Files
The various boundaries are also offered as
GIS files in both Arc/Info export (.e00) format, and as Arc View shapefiles. Shapefiles
can also be viewed with the free
Arc Explorer viewer. The shape files have been zipped with Pkzip. Some
.e00 export files have been compressed with the UNIX "compress" command. (If
they are compressed they will have a .Z extension.) Use the UNIX "uncompress"
utility or the free
gzip.exe DOS utility.
OPDs can also be purchased by paper copies as
maps or in digital formats from the
Public Information Office, or call 1-800-200-GULF.
Note:
The precise coordinates of a GIS file can be altered slightly by various GIS
functions. For that reason, these GIS files are not an Official Record for MMS
offshore boundaries. Only the coordinates shown on Official OPDs,
CBDs, and SOBDs
constitute an Official Record for offshore coordinate values.
Note:
All coordinates for the Gulf of Mexico Region leases and cadastre data are done
on the North American Datum of 1927 (NAD 27).