Nevada Water Science Center
Funding support for the Lake Tahoe Hydromapper by U.S Forest Service Lake Tahoe Basin Management Unit (LTBMU)

USGS Science in the Lake Tahoe Basin

Additional Data

Plan views of sampling at Marlette Creek and Incline Creek
Water Quality and sediment temperature

Water-quality and sediment-temperature data were collected to estimate nitrogen and phosphorus nutrient loads from Incline and Marlette Creeks to Lake Tahoe. Data were evaluated to better understand biogeochemical processes within the stream-lake interface.

Date Collected: September 2013

Data Collected: Sediment and water temperature, dissolved nitrate plus nitrite, dissolved, ammonium, total Kjeldahl nitrogen, soluble orthophosphate, dissolved phosphorus, total phosphorus, and dissolved organic carbon.

Data
Historical digital orthophotos
Historical Orthoimagery

USGS Western Geographic Science Center developed a series of historical digital orthoimagery (HDO) datasets photogrammically from aerial photography with varying scales, camera characteristics, image quality, and capture dates.

Data Available:

  • 1940 - southern Lake Tahoe Basin,
  • 1969 - entire Lake Tahoe Basin, and
  • 1987 - southern Lake Tahoe Basin.

Data
Bathymetry

USGS Pacific Coastal and Marine Science Center, in cooperation with the University of New Brunswick, Canada Ocean Mapping Group, conducted a bathymetric survey to study the morphology and material of the lake floor.

Date Collected: August 1998

Data Available: Bathymetric (depth information) and backscatter (the strength of sound energy that bounces back).

Report Data & Images

Digital Data From Lake Tahoe Data Clearinghouse

Part of the DLG for the Lake Tahoe Basin
Digital Line Graph (DLG)

DLGs are a digital vector representation of cartographic information derived from USGS maps and related sources.

Created From: 18 7.5-minute quadrangles that cover the Lake Tahoe Basin.

Created Using: UTM NAD27 zone 10 projection in compressed Shapefile format.

Hypsography Vegetation Roads Lakes Rivers Docks
Part of the DEM for the Lake Tahoe Basin
Digital Elevation Model (DEM)

Created From: 18 7.5-minute quadrangles of 10-m DEMs and data collected on a 1988 bathymetric survey of the lake.

Created Using: UTM NAD27 zone 10 projection.

Without bathymetry With bathymetry Hillshade JPEG
Part of the DOQ for the Lake Tahoe Basin
Digital Orthophoto Quadrangle (DOQ)

A standard DOQ covers a quarter section of a 7.5-minute quadrangle.

File Sizes: 1-m resolution quarter section is about 50 megabytes (MB) and complete DOQ is about 3 gigabytes (GB).

Created From: Multiresolution seamless image database (MrSID) compression and a .sid file format.

Created Using: UTM NAD83 zone 10 projection.

DOQ for 1992 DOQ for 1998
Part of the DRG for the Lake Tahoe Basin
Digital Raster Graphic (DRG)

DRGs are lower resolution and have a smaller file size than DOQs; the Lake Tahoe Basin mosaic is about 81 MB in size.

Created From: Eighteen USGS 7.5-minute topographic maps mosaicked using MrSID compression and a .sid file format.

Created Using: UTM NAD27 zone 10 projection.

GeoTiff MrSID