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Mapping the floor of Lake Mead (Nevada and Arizona): Preliminary discussion and GIS data release, USGS Open-File Report 03-320

METADATA AND DATA CATALOG

Federal Geographic Data Committee (FGDC) compliant metadata is available for all the data contained on this DVD. The text, HTML, and FAQ versions of the metadata reside in the "data/metadata" directory and the links to those files are provided below. These metadata files all contain the same information, just in slightly different formats. ArcGIS 8.2 compatible XML metadata is stored in the directory with the actual data files. In the case of non-GIS or non-text data (i.e. PDF files), the XML file resides in the directory containing that data type. For instance, the XML metadata for the 1999 PDF log books resides in the "data/pdflogs/1999" directory, the XML metadata for the 1999 seismic-reflection profile images resides in the "seisimages/1999" directory.

Shapefiles generally include *.shp, *.shx, and *.dbf files at a minimum. For the sake of brevity, only the filename prefix has been included in the filename designation listed below; extensions have been excluded. All the files necessary to load a shapefile have been compressed into a single WinZip file. Therefore, these shapefiles can be downloaded directly from the DVD, or by transferring clicking on the filename in the data catalog and saving the "zipped" files to a preferred location and uncompressing them. Image, PDF, and text files can be transferred in the same manner.

Images are available in both the TIFF and Mr. Sid image formats. The accompanying world file for each image is necessary to display the image in its appropriate geographic location within a GIS and therefore needs to be downloaded as well. It is recommended that when downloading from the data catalog below, the Mr. Sid image be selected since it is a considerably smaller file.

ESRI grids cannot be copied directly from the DVD. To successfully copy an ESRI grid, ESRI software such as ArcView or ArcCatalog need to be used. For that reason, grids were exported from the ESRI software into and ESRI ASCII grid format. These ASCII grids and their projection file were then WinZipped into a single file. These "zipped" files are available for download by clicking on the filename. CAUTION: These files can be extremely large, on the order of 300 MBytes. It is recommended that the Mr. Sid image of the appropriate grid be downloaded instead.

Clicking on the camera icon will give a preview of the dataset. In most cases this image contains other information to help orientate the viewer. For instance, the lake bounds graphic also contains the state boundaries for reference. The hillshade relief of the study are contains the lake bounds for a reference. Not every file has a graphic. If two files differ only in format or projection, only one of the files will have a representative image.

For guidance in where to obtain software capable of reading PDF files and uncompressing zipped files, see the system requirements page.

bounds (data/bounds)

Filename Description
Metadata
lakebnds.*
 ESRI polygon shapefile of the Lake Mead shoreline
sedlimit.*
 ESRI polygon shapefile of the extent of post-impoundment sediment within Lake Mead
thalweg.*
 ESRI polyline shapefile of the thalweg of the Colorado River prior to the formation of Lake Mead

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DOQ (data/doq)

Filename Description
Metadata
lm_4mdoq.sid
lm_4mdoq.sdw   		4m/pixel DOQ mosaic of the study area - geographic coordinate system
lm_4mdoqutm.sid
lm_4mdoqutm.sdw 		4 m/pixel DOQ mosaic of the study area - UTM, Zone 11, NAD83 projection

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isopach (data/isopach)

Filename Description
Metadata
isogrid
 ESRI grid of sediment thickness within Lake Mead (UTM projection)
isogrdgeog
 ESRI grid of sediment thickness within Lake Mead (geographic coordinate system)
isoimg.tif
isoimg.tfw
TIFF image depicting sediment thickness within Lake Mead (UTM projection)
isoimg_geog.tif isoimg_geog.tfw
 TIFF image depicting sediment thickness within Lake Mead (geographic coordinate system)

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Navigation (data/nav)
1999 navigation (data/nav/1999)

Filename Description
Metadata
allgps_99.txt  reformatted raw navigation - ASCII text
lm99_100sht.*
 ESRI point shapefile of chirp data - point every 100 shots
lm99_500sht.*
 ESRI point shapefile of chirp data - point every 500 shots
seisnav_99.*
 ESRI polyline shapefile indicating the tracklines along which chirp seismic-reflection data were collected

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2000 navigation (data/nav/2000)

Filename Description
Metadata
allhyp_00.txt reformatted raw navigation - ASCII text
lm00_100sht.*
 ESRI point shapefile of chirp data - point every 100 shots
lm00_500sht.*
 ESRI point shapefile of chirp data - point every 500 shots
seisnav_00.*
 ESRI polyline shapefile indicating the tracklines along which chirp seismic-reflection data were collected
ssnav_00.*
 ESRI polyline shapefile indicating the tracklines along which sidescan-sonar data were collected

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2001 navigation (data/nav/2001)

Filename Description
Metadata
allhy_01.txt reformatted raw navigation - ASCII text
lm01_100sht.*
 ESRI point shapefile of chirp data - point every 100 shots
lm01_500sht.*
 ESRI point shapefile of chirp data - point every 500 shots
seisnav_01.*
 ESRI polyline shapefile indicating the tracklines along which chirp seismic-reflection data were collected
lm01boom.*
 ESRI polyline shapefile indicating the tracklines along which boomer seismic-reflection data were collected
lm01boom_100sht.*
 ESRI point shapefile of boomer data - point every 100 shots
lm01boom_500sht.*
 ESRI point shapefile of boomer data - point every 500 shots

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PDF log books
1999 (data/pdflogs/1999)
2000 (data/pdflogs/2000)
2001 (data/pdflogs/2001)

Filename Description
Metadata
99014isi.pdf PDF 1999 log book for the ISIS acquisition system (sidescan-sonar and chirp seismics)
99014nav.pdf PDF 1999 log book for the navigation
00027isi.pdf PDF 2000 log book for the ISIS acquisition system (sidescan-sonar only)
00027nav.pdf PDF 2000 log book for the navigation
00027sei.pdf PDF 2000 log book for chirp seismic acquisition (Knudsen)
01007isi.pdf PDF 2001 log book for the ISIS acquisition system (sidescan-sonar and chirp seismics)
01007nav.pdf PDF 2001 log book for the navigation
01007sei.pdf PDF 2001 log book for the boomer seismic acquisition

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Seismic JPEG images
1999 (data/seisimages/1999)
2000 (data/seisimages/2000)
2001 (data/seisimages/2001)
For the interpreted seismic-reflection profiles, the blue line represents the interpreted post-impoundment surface while the red line represented the interpreted pre-impoundment surface. Click on the above directories to see images of the profiles. Selecting the filename below allows you to download the image collection contained in a WinZip file.

Filename Description
Metadata
99seisinterp.zip JPEG images of the 1999 interpreted chirp seismic-reflection profiles
99seisraw.zip JPEG images of the 1999 uninterpreted chirp seismic-reflection profiles
00seisinterp.zip JPEG images of the 2000 interpreted chirp seismic-reflection profiles
00seisraw.zip JPEG images of the 2000 uninterpreted chirp seismic-reflection profiles
01boominterp.zip JPEG images of the 2001 interpreted boomer seismic reflection profiles
01boomraw.zip JPEG images of the 2001 uninterpreted boomer seismic-reflection profiles
01chirpinthalf.zip JPEG images of the 2001 interpreted chirp half-second seismic reflection profiles
01chirprawhalf.zip JPEG images of the 2001 uninterpreted chirp half-second seismic-reflection profiles
01chirpint1sec.zip JPEG images of the 2001 interpreted chirp one-second seismic-reflection profiles
01chirpraw1sec.zip JPEG images of the 2001 uninterpreted chirp one-second seismic-reflection profiles

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Seismic HTML documents
1999 (data/htmlseis/1999)
2000 (data/htmlseis/2000)
2001 (data/htmlseis/2001/boomer) (data/htmlseis/2001/halfsec) (data/htmlseis/2001/onesec) Click on the above directories to access the html documents of the seismic profiles.

Filename Description
Metadata
99*.htm HTML documents containing interpreted and uninterpreted chirp seismic-reflection profiles for each line of data acquired in 1999
00*.htm HTML documents containing interpreted and uninterpreted chirp seismic-reflection profiles for each line of data acquired in 2000
01_b*.htm HTML documents containing interpreted and uninterpreted boomer seismic-reflection profiles for each line of data acquired in 2001
01*.htm HTML documents containing interpreted and uninterpreted chirp half-second fire rate seismic-reflection profiles for each line of data acquired in 2001
01*.htm HTML documents containing interpreted and uninterpreted chirp 1-second fire rate seismic-reflection profiles for each line of data acquired in 2001

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Sidescan-Sonar Mosaics
Geographic Coordinate System (data/sscanimgs/geographic/enhanced) (data/sscanimgs/geographic/unenhanced)
refer to Figure 1 for location names.

Filename Description
Metadata
bbasinenh_g.sid bbasinenh_g.sdw
 enhanced Mr. Sid image from Boulder Basin (geographic coordinate system)
bbasinenh_g.tif bbasinenh_g.tfw
 enhanced TIFF image from Boulder Basin (geographic coordinate system)
lvwash_eng.tif lvwash_eng.tfw
 enhanced TIFF image from Las Vegas Wash (geographic coordinate system)
overtonenh_g.sid overtonenh_g.sdw
 enhanced Mr. Sid image from Overton Arm (geographic coordinate system)
overtonenh_g.tif overtonenh_g.tfw
 enhanced TIFF image from Overton Arm (geographic coordinate system)
tempiceenh_g.sid tempiceenh_g.sdw
 enhanced Mr. Sid image from Temple Basin to Iceberg Canyon (geographic coordinate system)
tempiceenh_g.tif tempiceenh_g.tfw
 enhanced TIFF image from Temple Basin to Iceberg Canyon (geographic coordinate system)
vbasinenh_g.sid vbasinenh_g.sdw
 enhanced Mr. Sid image from Virgin Basin (geographic coordinate system)
vbasinenh_g.tif vbasinenh_g.tfw
 enhanced TIFF image from Virgin Basin (geographic coordinate system)
bbasin_ungeog.sid bbasin_ungeog.sdw
 unenhanced Mr. Sid image from Boulder Basin (geographic coordinate system)
bbasin_ungeog.tif bbasin_ungeog.tfw
 unenhanced TIFF image from Boulder Basin (geographic coordinate system)
lvwash_ung.tif lvwash_ung.tfw
 unenhanced TIFF image from Las Vegas Wash (geographic coordinate system)
overton_ungeog.sid overton_ungeog.sdw
 unenhanced Mr. Sid image from Overton Arm (geographic coordinate system)
overton_ungeog.tif overton_ungeog.tfw
 unenhanced TIFF image from Overton Arm (geographic coordinate system)
tempice_ungeog.sid tempice_ungeog.sdw
 unenhanced TIFF image from Temple Basin to Iceberg Canyon (geographic coordinate system)
tempice_ungeog.tif tempice_ungeog.tfw
 unenhanced TIFF image from Temple Basin to Iceberg Canyon (geographic coordinate system)
vbasin_ungeog.sid vbasin_ungeog.sdw
 unenhanced Mr. Sid image from Virgin Basin (geographic coordinate system)
vbasin_ungeog.tif vbasin_ungeog.tfw
 unenhanced TIFF image from Virgin Basin (geographic coordinate system)

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UTM, Zone 11, NAD83 projection mosaics
(data/sscanimgs/utm11/enhanced)
(data/sscanimgs/utm11/ unenhanced)
(data/sscanimgs/utm11/dctenh)
refer to Figure 1 for location names. *The last four images in this section (with the asterisk) are the tone-matched images the cover the Boulder Basin area and eastward.

Filename Description
Metadata
bbasinenh.sid bbasinenh.sdw
 enhanced Mr. Sid image from Boulder Basin (UTM projection)
bbasinenh.tif bbasinenh.tfw
 enhanced TIFF image from Boulder Basin (UTM projection)
lvwash_en.tif lvwash_en.tfw
 enhanced TIFF image from Las Vegas Wash (UTM projection)
overtonenh.sid overtonenh.sdw
 enhanced Mr. Sid image from Overton Arm (UTM projection)
overtonenh.tif overtonenh.tfw
 enhanced TIFF image from Overton Arm (UTM projection)
tempiceenh.sid tempiceenh.sdw
 enhanced Mr. Sid image from Temple Basin to Iceberg Canyon (UTM projection)
tempiceenh.tif tempiceenh.tfw
 enhanced TIFF image from Temple Basin to Iceberg Canyon (UTM projection)
vbasinenh.sid vbasinenh.sdw
 enhanced Mr. Sid image from Virgin Basin (UTM projection)
vbasinenh.tif vbasinenh.tfw
 enhanced TIFF image from Virgin Basin (UTM projection)
bbasin_un.sid bbasin_un.sdw
 unenhanced Mr. Sid image from Boulder Basin (UTM projection)
bbasin_un.tif bbasin_un.tfw
 unenhanced TIFF image from Boulder Basin (UTM projection)
lvwash_un.tif lvwash_un.tfw
 unenhanced TIFF image from Las Vegas Wash (UTM projection)
overton_un.sid overton_un.sdw
 unenhanced Mr. Sid image from Overton Arm (UTM projection)
overton_un.tif overton_un.tfw
 unenhanced TIFF image from Overton Arm (UTM projection)
tempice_un.sid tempice_un.sdw
 unenhanced TIFF image from Temple Basin to Iceberg Canyon (UTM projection)
tempice_un.tif tempice_un.tfw
 unenhanced TIFF image from Temple Basin to Iceberg Canyon (UTM projection)
vbasin_un.sid vbasin_un.sdw
 unenhanced Mr. Sid image from Virgin Basin (UTM projection)
vbasin_un.tif vbasin_un.tfw
 unenhanced TIFF image from Virgin Basin (UTM projection)
*bbasin_enh.tif bbasin_enh.tfw
 enhanced TIFF image from Boulder Basin (UTM projection) - tonematched to overton_enh.tif, tempice_enh.tif, and vbasin_enh.tif
*overton_enh.tif overton_enh.tfw
 enhanced TIFF image from Overton Arm (UTM projection) - tonematched to bbasin_enh.tif, tempice_enh.tif, and vbasin_enh.tif
*tempice_enh.tif tempice_enh.tfw
 enhanced TIFF image from Temple Basin to Iceberg Canyon (UTM projection) - tonematched to bbasin_enh.tif, overton_enh.tif and vbasin_enh.tif
*vbasin_enh.tif vbasin_enh.tfw
 enhanced TIFF image from Virgin Basin (UTM projection) - tonematched to overton_enh.tif, tempice_enh.tif, and vbasin_enh.tif

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Surfaces
Geographic Coordinate System (data/surfaces/geographic)

Filename Description
Metadata
preshshd_g.tif preshshd_g.tfw

 TIFF image of the preshshd grid (geographic coordinate system)
preshshd_g.sid preshshd_g.sdw
 Mr. Sid image of the preshshd grid (geographic coordinate system)
pres10whshd_g.tif pres10whshd_g.tfw

TIFF image combining a color coded presentday grid with the preshshd grid (geographic coordinate system)
pres10whshd_g.sid pres10whshd_g.sdw
 Mr. Sid image combining a color coded presentday grid with the preshshd grid (geographic coordinate system)
pres30hshd_g.tif pres30hshd_g.tfw

TIFF image of the pres30hshd grid (geographic coordinate system)
pres30hshd_g.sid pres30hshd_g.sdw
 Mr. Sid image of the pres30hshd grid (geographic coordinate system)
pres30whshd_g.tif pres30whshd_g.tfw

TIFF image combining a color coded present30m grid with the pres30hshd grid (geographic coordinate system)
pres30whshd_g.sid pres30whshd_g.sdw
 Mr. Sid image combining a color coded present30m grid with the pres30hshd grid (geographic coordinate system)

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UTM, Zone 11, NAD83 projection surfaces (data/surfaces/utm11)

Filename Description
Metadata
pres30hshd
 ESRI hillshade grid, 30m/pixel. Present day surface Includes on land DEM, underwater surface from contours and 2002 swath bathymetry (UTM projection)
present30m
 ESRI grid, 30m/pixel. Present day surface Includes on land DEM, underwater surface from contours and 2002 swath bathymetry (UTM projection)
presentday
 ESRI grid, 10m/pixel. Present day surface Includes on land DEM, underwater surface from contours and 2002 swath bathymetry (UTM projection)
preshshd
 ESRI hillshade grid, 10m/pixel. Present day surface Includes on land DEM, underwater surface from contours and 2002 swath bathymetry (UTM projection)
preshshd.tif preshshd.tfw
 TIFF image of the preshshd grid (UTM projection)
preshshd.sid preshshd.sdw
 Mr. Sid image of the preshshd grid (UTM projection)
pres10whshd.tif pres10whshd.tfw
 TIFF image combining a color coded presentday grid with the preshshd grid (UTM projection)
pres10whshd.sid pres10whshd.sdw
 Mr. Sid image combining a color coded presentday grid with the preshshd grid (UTM projection)
pres30hshd.tif pres30hshd.tfw
 TIFF image of the pres30hshd grid (UTM projection)
pres30hshd.sid pres30hshd.sdw
 Mr. Sid image of the pres30hshd grid (UTM projection)
pres30whshd.tif pres30whshd.tfw

TIFF image combining a color coded present30m grid with the pres30hshd grid (UTM projection)
pres30whshd.sid pres30whshd.sdw
 Mr. Sid image combining a color coded present30m grid with the pres30hshd grid (UTM projection)

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