Marsh CD Frequently Asked Questions Tuesday, April 22, 2003
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.

   

What areas of the state are covered?

The area that is considered to be in the Louisiana coastal zone.
   
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.

   
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.

   
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.
   
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