1968 Louisiana Coastal Marsh Vegetative Type Transect Point DatasetEntry ID: usgs_nwrc_louisianatransect
Abstract: This dataset contains a point coverage with an associated database file. The
original dataset was collected through visual field observation by Robert
Chabreck (Louisiana Cooperative Wildlife Research Unit, LSU), Ted Joanen
(Louisiana Wildlife and Fisheries Commission) and A.W. Palmisano (Louisiana
State University). The observations were made flying over the study area
(Louisiana Coastal Zone). ... The flight was along north/south transects spaced 7.5
minutes apart from the Texas state line to the Mississippi state line.
Vegetative data were obtained at predetermined stations spaced 1/4 miles along
each transect. This information was recorded manually into field tally sheets.
The flight line data was used as a guide to generate the points along the
transect routes using ARC/Info 8.0. The new dataset resulted in a point
coverage and associated database file containing vegetative marsh type
attributes along transect flight lines. Coverage is of the coastal region of
the State of Louisiana. The purpose of the dataset is to create an Arc/Info
point coverage of the 1968 Louisiana Coastal Marsh Type Study.
The attribute information from the original tally field sheets were entered
into a dbf file. A GIS software application (Arc/Info) was used to generate the
points along the transect routes. The new dataset resulted in a point coverage
containing the vegetative marsh type attributes along transect flight lines.
Data Set Citation
Dataset Originator/Creator: U.S. Geological Survey, Biological Resources Division, National Wetlands Research Center
Dataset Title: 1968 Louisiana Coastal Marsh Vegetative Type Transect Point Dataset
Dataset Release Date: 20000912
Dataset Publisher: USGS, BRD, National Wetlands Research Center
Data Presentation Form: Digital database
Start Date: 1968-08-01Stop Date: 1968-12-31
Quality For the original data, the accuracy is not based on a formal quantitative
assessment and was based on the judgement of the data collector in the field.
A visual hard copy to screen comparison was made to ensure point location
accuracy and that no points were excluded or have missing attributes. The
... attribute information was checked against the field tally sheets and reviewed
by Dr. Chabreck.
For the original data, all data were derived in the same general format of
collecting data at pre-determined stations while flying along transect routes
in a helicopter. Stations ending in 1-8 were observed from the air; stations
ending in 9 were observed on ground. There were no stations ending in 0; these
were excluded from the study survey method.
Horizontal positional accuracy is determined by the source data.
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
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 U.S. Geological
Survey, National Wetlands Research Center 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.
Data Set Progress
Role: TECHNICAL CONTACT
Phone: 225 342-5319
Fax: 225 342-4380
Email: annb at dnr.state.la.us
U.S. Geological Survey Biological Resources Division National Wetlands Research Center 700 Cajundome Boulevard
Province or State: Louisiana
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2003-06-27
Last DIF Revision Date: 2017-08-23
Future DIF Review Date: 2004-06-27