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

Table 1.

system/parameter	1999 survey	2000 survey	2001 survey
navigation	P-Code GPS	P-Code GPS	P-Code GPS
navigation storage software	USGS software	Coastal Oceanographics Hypack	Coastal Oceanographics Hypack
sidescan-sonar towfish	Benthos SIS-1000	Edgetech DF-1000	Benthos SIS-1000
Swath widths	1500m, 750m	200m	1500m, 800m
Chirp seismic system	Benthos SIS-1000	Knudsen	Benthos SIS-1000
Chirp fire rate or range	one second half second	50m, 100m, 200m	one second 0.53 second
Boomer seismic system	none acquired	none acquired	Benthos streamer, Geopulse sound source
Boomer fire rate	NA	NA	Half second
Boomer logging system	NA	NA	Delph-Elics
km survey lines	366	77	955
Sidescan logging system	ISIS Triton-Elics	ISIS Triton-Elics	ISIS Triton-Elics
Chirp logging system	ISIS Triton-Elics	Knudsen software	ISIS Triton-Elics
Survey vessel	19-m houseboat	8-m pontoon boat	19-m houseboat
Fathometer	Odom fathometer	Garmin fathometer	Odom fathometer
Primary survey area (see Fig. 1)	Boulder Basin	Las Vegas Bay; Las Vegas Wash, Government Wash, Gypsum Wash	Remainder of Lake Mead east of Boulder Basin

A more complete description of these systems as used by the USGS can be found on the USGS Seafloor Mapping website.

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