Virginia Civil War Battlefields Wetland Classification Digital Maps
Entry ID:
usgs_nwrc_virginiabattlefields
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Summary
This data set consists of wetlands delineations for the Virginia Civil War
battlefields (Fredericksburg-Spotsylvania National Military Park). The purpose
of the dataset is to conduct wetlands mapping to represent ecological and
biological data derived from current aerial photography.
Aerial photography was acquired for the project area. Following a ground
... truthing exercise, the photos were then interpreted according to their wetland
habitats; a Bausch Lomb stereoscope was using for the photointerpretation
process at a 10x magnification. The delineated data was then transferred to
base maps using a Zoom Transfer Scope; this process removes any distortion from
the image. In all of these processes, the product is throughly scrutinized
using standard operating procedures for quality control and assessment. The
mylar overlays were then digitized using an Altek Datatab digitizer. Four
control points corresponding to the four corners of the quadrangle were used
for registration during data collection. Cover type features continuing onto
adjacent quadrangles were adjusted to intersect the quad boundary at a common,
coincident node. Attributes were assigned during either the digitizing or
editing stages.
This metadata was originally created in Biological Data Profile format by
Helena Schaeffer of the U.S. Geological Survey, National Wetlands Research
Center.
Geographic Coverage
Spatial coordinates
| N: 38.38 |
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S: 38.12 |
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E: -77.5 |
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W: -77.88 |
Data Set Citation
Dataset Creator:
U.S. Geological Survey, National Wetlands Research Center
Dataset Title:
Virginia Civil War Battlefields Wetland Classification Digital Maps
Dataset Release Date:
1998-01-01
Dataset Release Place:
Lafayette, Louisiana
Dataset Publisher:
USGS, BRD, National Wetlands Research Center
Data Presentation Form:
Digital vector data
Online Resource:
http://sdms.nwrc.gov/data/metadata/civil.html
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Temporal Coverage
Start Date:
1993-03-12
Stop Date:
1999-01-01
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Location Keywords
Science Keywords
ISO Topic Category
Quality
Interpreted photos were quality checked by two photointerpreters for attribute
classification. Field verification was performed for chosen areas of the study.
The mylar based maps were checked by cartographic personnel for line and
labelworks, following mapping conventions and standards. The digital attribute
accuracy is tested by manually comparing hard copy plots ... of the data with
source materials. When attributes cannot be visually verified on plots, they
are interactively queried and verified on screen. In addition, the attributes
are compared against a master set of valid attributes.
ARC/INFO software is used to create and maintain topological relationships
between features. There are no duplicate features. Polygonal features begin and
end at the same point, contain no overshoots or undershoots, and contain one
label. Linear features are continuous where appropriate,i.e., dangling arcs are
removed if they are not required.
For cartographic process, accordance with nationally accepted mapping standards
and conventions were followed. Processing of digital data follows conventions
and standard methodologies for the time period and within limitations of
available workstation equipment at the date of data development.
Access Constraints
It is strongly recommended that this data is directly acquired from the
distributor described above or from another USGS Biological Resources Division
server and not indirectly through other sources which may have changed the data
in some way. The distributor makes no claims as to the data's suitability for
other purposes.
Use Constraints
Acknowledgement of the U.S. Geological Survey, National Wetlands Research
Center as a data source would be appreciated in products developed from these
data, and such acknowledgment as is standard for citation and legal practices
for data source is expected by users of this data. Sharing new data layers
developed directly from these data would also be appreciated by ... NWRC staff.
Users should be aware that comparison with other data sets for the same area
from other time periods may be inaccurate due to inconsistencies resulting from
changes in mapping conventions, data collection, and computer processes over
time. The distributor shall not be liable for improper or incorrect use of this
data, based on the description of appropriate/inappropriate uses described in
this metadata document. These data are not legal documents and are not to be
used as such.
Ancillary Keywords
Data Set Progress
Data Center
Personnel
LARRY
HANDLEY
Role:
INVESTIGATOR
Phone:
337-266-8691
Fax:
337-266-8513
Email:
larry_handley at usgs.gov
Contact Address:
U.S. Geological Survey, Biological Resources Division,
National Wetlands Research Center
700 Cajundome Blvd
City:
Lafayette
Province or State:
Louisiana
Postal Code:
70506
Country:
USA
TYLER
B.
STEVENS
Role:
DIF AUTHOR
Phone:
(301) 614-6898
Fax:
301-614-5268
Email:
Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
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Related URL
Creation and Review Dates
DIF Creation Date:
2003-06-27
Last DIF Revision Date:
2004-08-27
Future DIF Review Date:
2004-06-27
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Links
