What
is TM 2002 data?
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The TM 2002 collection is Landsat Thematic Mapper (TM)
satellite data of the lands and waters of the State
of Louisiana acquired in the year 2002. This collection
on Atlas consists of images subsetted according to the
1:100,000 USGS index from three seamless, statewide
images: a 15 meter panchromatic image, a 25 meter multispectral
image, and a 12.5 meter sharpened mosaic that was constructed
from fusing bands 7,5 & 3 as red, green, and blue
with the panchromatic image. |
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Who
created the TM 2002 images for Louisiana?
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The mosaicked satellite images were produced by Dewitt
Braud of the LSU
Department of Geography and Anthropology under contract
to the Louisiana
Department of Environmental Quality. The images will
support on-going research for the LDEQ Non-Point Source
Program by providing a more current view of land cover/land
use within Louisiana. The images will also support the
USGS National Wetlands Research Center (NWRC) in evaluating
Louisiana's coastal wetlands. |
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| How
can I view the TM 2002 images? |
Each image is a GeoTIFF image. Any program that can read
TIF files can read and display the images. You will also
be able to see the TM 2002 data shortly in a raster format
online by using Atlas's Rasterviewer
by setting its background to one of the TM 2002 selections. |
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| Can
the TM 2002 images be used with a GIS? |
Yes!
Any GIS that can display GeoTIF files can display these
files. Also, an ESRI world file (.tfw) has been supplied
for those applications that do not support GeoTIF but
are able to use a world file to place the image correctly
on the Earth's surface. |
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| What
is the projection of the TM 2002 images? |
The images are in UTM zone 15 north, North American Datum
1983, ground units of meters. |
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What
are the limits of the usage of the TM 2002 images?
and
What is the resolution of the images? |
The panchromatic images and the fusion images have a resolution
of 12.5 meters. The multispectral RGB images have a resolution
of 25 meters. |
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What
parts of the state is covered? |
The
TM 2002 images, in all three forms, cover the entire
state. Each seamless, statewide image was subsetted
into smaller images for downloading across the web.
To see an index of the images, use the following links.
Panchromatic images
http://data1.atlas.lsu.edu/other_as_shp/tm2002_pan_tiles.zip
RGB 7,5,3 multispectral images
http://data1.atlas.lsu.edu/other_as_shp/tm2002_753_tiles.zip
Panchromatic RGB fusion images
http://data1.atlas.lsu.edu/other_as_shp/tm2002_fusion_tiles.zip
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| Where
can I get more information about TM 2002 images? |
Each
downloadable Winzip archive containing a TM 2002 image
also contains metadata in various forms that document
the larger state image from which the image was created.
To view this metadata and frequently-asked-questions,
click on the following links.
for the Panchromatic images: metadata and
FAQ
for the RGB 7,5,3 images: metadata and FAQ
for the Panchromatic/RGB 7,5,3 Fusion images: metadata
and FAQ
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| How
do I download the images from Atlas? |
Use
the "Search
Atlas" link on the Atlas home page and set
the area to "100K USGS Quads." Select a quad
from the pulldown box or from the displayed index map.
The panchromatic, RGB, and fusion images for that quadrangle
will display below the index map.
Click
here to view a list of all the Panchromatic images.
Click
here to view a list of all the RGB 7,5,3 Multispectral
images.
Click
here to view a list of all the Panchromatic/RGB
7,5,3 fusion images. |
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