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The AAPG/Datapages Combined Publications Database
Ohio Geological Society
Abstract
OGS-AAPG
Ohio Geological Society:Canton Symposium IV: Fourth Annual Technical Symposium, October 9,
DIGITIZING OHIO'S OIL AND GAS WELL SPOT MAPS
Larry Wickstrom, Ohio Department of Natural Resources, Division of Geological Survey, Columbus, OH
ABSTRACT
The Ohio Division of Geological Survey, along with the
Ohio Division of Oil and Gas, are transferring oil and gas
well spot maps to digital
map files. Currently, oil and gas
wells are spotted by hand onto County Engineer/County
Auditor tax maps. Transferring the well spot maps from a
paper to a
digital
realm will result in a more accurate, easily
readable, applicable product. The ability for the public to
access the new
digital
well spot maps will result in broader,
more innovative usage of the oil and gas well information.
The building of the digital
oil and gas well spot maps is a
multi-stage process. The
digital
base maps used in this
project are assembled from the U.S. Geological Survey
Digital
Line Graph (DLG) files of the 7.5 minute topographic
maps of Ohio where possible. These maps are exact
reproductions of the U.S. Geological Survey 7.5 minute
topographic maps and are currently being created as part
of a cooperative project between the U.S. Geological Survey
and the state of Ohio. All the Ohio DLG topographic map
files will be finished and available by the end of 1997. For
those areas currently not covered by the DLG files, the
political boundaries and the section lines are accurately
digitized from the U.S. Geological Survey 7.5 minute topographic
maps. The DLG quadrangle map files are then
compiled into county map files. Once compiled, the irregular,
original land subdivisions are digitized into the county
base map files. The state of Ohio has twelve major schemes
for land subdivision. Only in northwestern Ohio does the
land subdivision correspond to the Public Land Surveying
System (PLSS). The irregular lots, tracts, allotments, and
subdivisions are digitized from the well spot maps and all
attempts are made to exactly reproduce the irregular subdivisions.
The original mylar township-well-spot maps, along with
the new digital
county base maps, are sent to the contractor
to digitize the well locations and enter the data elements
surrounding each well. The contractor for this project is
Ohio Penal Industries, under the project management of
Lockwood, Jones, and Beals, Inc. For this project, the
contractor has built a customized data entry and digitizing
system, which includes special options for reproducing the
well symbols and creating a database containing the well
location and up to seven other attributes per well. The data
attributes captured as part of this project include the
permit number, the lease number, the initial production of
gas and oil, type of well permit, and up to two producing
horizons. Upon receipt of the well spot maps and
digital
base maps, the contractor separates the county base map
file into its component townships. The contractor then
rectifies the original mylar township-well-spot maps to the
new
digital
base map. The setup of the township well spot
map to its corresponding
digital
base map is required to
have a misclosure of no more than 50 feet. If the misclosure
is larger than 50 feet, then digitizer setups will occur on
progressively smaller areas until the misclosure is acceptable.
After the well spots are digitized, they undergo quality
control checks by both the contractor and the Ohio Department
of Natural Resources. The
digital
files are checked to
ensure that all oil and gas wells were digitized, locations
are correct, well attributes have been correctly entered, and
that the maps are cartographically readable. Once the
visual quality control has been completed, a computer
database file is generated, consisting of the coordinates of
the well and the attributes surrounding the well. The
database is also put through quality control checks to test
for any major mistakes.
There are many results that will come from this project.
We will be moving away from mylar and paper well spot
maps. One major advantage of the new digital
well spot
maps is that they will not decompose over time as do the
paper maps. The mylar township well spot maps suffer
from readability problems. As wells are spotted on the
mylar maps, original information is being erased due to
cartographic readability issues. This information is lost
forever. Using sophisticated visualization and plotting techniques,
information can be faded and screened to enhance
readability and avoid the loss of ancillary information. The
new base maps are far more accurate than the County
Engineer/County Auditor tax maps that are currently being
used as base maps. The U.S. Geological Survey 7.5
minute topographic maps were created using aerial
orthophotography and field surveying. The U.S. Geological
Survey map makers used the surveyed distances from the
original plats of the 1790's and early 1800's to find the
section and township corners in the field. The location of
these section and township corners were then transferred
to the topographic maps, giving us great confidence that the
section lines are accurately represented in both the 7.5
minute topographic maps and their
digital
representations,
the DLG files. These new
digital
well spot maps are
the beginnings of an integrated geographic information
system for the Division of Geological Survey and the Division
of Oil and Gas. The graphics that symbolize the well
locations are attached to an initial database that will grow
over time as data is added from the Division of Geological
Survey well cards and records from the Division of Oil and
Gas. The
digital
data will enable the rapid update of the
well spot maps and enable the public to perform more
complex analyses. The planned project completion date is
January 1997.
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