| What
is the Marsh CD? |
The Coastal Louisiana Marsh-Vegetation Types CD-ROM
(herewithin refered to as the Marsh CD) contains a collection
of geographic and nongeographic data about coastal Louisiana
marshes. Geospatial data and attributes, reports, photographs,
and graphics representing 1949, 1968, 1978, 1988, and
1997 surveys are included.
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| What
areas of the state are covered? |
The area that is considered to be in the Louisiana coastal
zone. |
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| In
what formats is the Marsh CD data stored? |
For
the years 1949, 1968, and 1978, the digital data was
generated from existing paper maps. The CD contains
digital versions of the original maps and the derived
vector data. Therefore, for these three years, there
are links to download
- a
vector version in shapefile format of the vegetative
types,
- both
a raster, georeferenced version in GeoTIFF format
and a raster, ungeoreferenced version in GIF format
of the original paper map used to create the vector
version,
- a
raster, ungeoreferenced version in GIF format of the
original paper map only.
For
the years 1988 and 1997, the data was stored in ESRI
shapefile format with accompanying Geomedia .csf coordinate
system files.
The
CD also contains TM imagery from 1995 and 2000 stored
in GeoTIFF format. |
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| From
where did the Marsh CD come? |
It
is the result of a partnership between the U.S. Geological
Survey National Wetlands Research Center, the Coastal
Wetlands Planning, Protection and Restoration Act, and
the Louisiana Department of Wildlife and Fisheries.
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| Who
can use the data contained on the CD? |
The
data is in the public domain. Acknowledgment of the National
Wetlands Research Center and the Louisiana Department
of Wildlife and Fisheries 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 over time.
These data are not legal documents and are not to be used
as such. |
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| From
where can I get more information about the Marsh CD? |
For
more information about the CD-ROM including the metadata
it contains, it is HIGHLY RECOMMENDED that you download
its documentation at
http://data1.cadgis.lsu.edu/marshcd_as_htm/marshcd_documents.zip
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