FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
TITLE: USGS 1:24,000 SURVEY CONTROL AND MARKERS
Geodataset Name: USGSSM Geodataset Type: SHAPE Geodataset Feature: POINT
GENERAL DESCRIPTION:
This dataset consists of information about the points of established position and third-order or better elevations that are used as fixed references in positioning and correlating map features.
DATA SOURCE(S): United States Geological Survey (USGS) SCALE OF ORIGINAL SOURCE MAPS: 1:24,000 DATE OF AUTOMATION OR SOURCE: USGS in 1987, FGDL in 1998
GEODATASET EXTENT:
This dataset covers the following counties: Alachua, Baker, Brevard, Broward, Charlotte, Citrus, Collier, Columbia, Dade, Desoto, Escambia, Hardee, Levy, Manatee, Marion, Monroe, Nassau, Orange, Palm Beach, Putnam, Santa Rosa, Sarasota, Seminole, and Volusia.
FEATURE ATTRIBUTE TABLES
Datafile Name: USGSSM.DBF
ITEM NAME WIDTH TYPE PRECISION AREA 18 DECIMAL 5 PERIMETER 18 DECIMAL 5 USGSSM_ 5 DECIMAL - USGSSM_ID 5 DECIMAL - MODN_ID 5 DECIMAL - ENTITY_LBL 7 CHARACTER - STATE 2 CHARACTER - COUNTY 3 CHARACTER - ELEVATION 12 DECIMAL 3 QUAD_COVER 8 DECIMAL - SURV_AREA 28 CHARACTER - MAP_DATE 4 DECIMAL - DESCRIPT 12 DECIMAL 3
FEATURE ATTRIBUTE TABLES CODES AND VALUES:
Codes for ENTITIY_LBL item:
MAJOR MINOR CODE CODE DESCRIPTION 150 ---- Survey Control and Markers 0300 Horizontal control station, third order or better, permanent mark 0301 Horizontal and vertical control station, third order or better 0303 Horizontal control station, checked 0310 Vertical control station, third order or better, tablet 0311 Vertical control station, recoverable mark, third order or better, no tablet 0330 Reference monument 0332 Other control point MODN_ID = Module number ID, relate item used to join feature attribute tables and .asmf (elevation data) tables. ELEVATION = Elevation in meters. QUAD_COVER = Coverage name of original quad coverages before they were APPENDed to create "survmk" coverage. SURV_AREA = Survey area of original quad coverages. There are several points for each survey area. MAP_DATE = Date of USGS topographic maps from which point coverages were derived. DESCRIPT = Elevation data in meters.
USER NOTES:
An elevation of -9999.990 indicates that there is no elevation data for a particular point.
FGDL QUALITY ASSURANCE STATUS:
-Joined the feature attribute tables and the related elevation
tables (.asmf) of the original quad coverages.
-Projected to FGDL Albers.
-Set tolerances to FGDL standards.
REFERENCES:
"Data Users Guide 1"--This is a guide that accompanies the
DIGITAL LINE GRAPHS produced from 1:24,000-scale maps
by the United States Geologicial Survey.
It is available on the internet at the following address:
ftp://mapping.usgs.gov/pub/ti/DLG/24kdlgguide/dugdlg24.txt
DATA LINEAGE SUMMARY:
The point coverage described in this document was derived from USGS topographic maps published as 7.5-minute quadrangles at 1:24,000 scale.
MAP PROJECTION PARAMETERS
Projection ALBERS Units METERS Datum HPGN Spheroid GRS1980 1st standard parallel 24 0 0.000 2nd standard parallel 31 30 0.000 central meridian -84 0 0.000 latitude of projection's origin 24 0 0.000 false easting (meters) 400000.00000 false northing (meters) 0.00000
DATA SOURCES CONTACT(S):
Name: U.S. Geological Survey, Branch of Technical Management Abbr.name: USGS Address: 510 National Center Reston, Virginia 22092
Name: Customer Services, U.S. Geological Survey EROS Data Center Abbr.name: USGS Address: 47914 252nd Street Sioux Falls, SD 57198-0001 Phone: 800-252-4547, 605-594-6151 Fax: 605-594-6589 TDD: 605-594-6933 Web site: http://www.usgs.gov Email: custserv@edcmail.cr.usgs.gov
FGDL CONTACT:
Name: FLORIDA GEOGRAPHIC DATA LIBRARY Abbr. Name: FGDL Address: Florida Geographic Data Library 431 Architecture Building PO Box 115706 Gainesville, FL 32611-5706 Web site: http://www.fgdl.org
Contact FGDL:
Technical Support: http://www.fgdl.org/fgdlfeed.html FGDL Frequently Asked Questions: http://www.fgdl.org/fgdlfaq.html FGDL Mailing Lists: http://www.fgdl.org/fgdl-l.html For FGDL Software: http://www.fgdl.org/software.html