USGS Science in the Lake Tahoe Basin

Data


Plan views of sampling at Marlette Creek and Incline Creek

Water-quality and sediment-temperature data to understand stream-lake processes

Water-quality and sediment-temperature data were collected in September 2013 to estimate nitrogen and phosphorus nutrient loads from Incline and Marlette Creeks to Lake Tahoe. A data set containing sediment and water temperature, dissolved nitrate plus nitrite, dissolved, ammonium, total Kjeldahl nitrogen, soluble orthophosphate, dissolved phosphorus, total phosphorus, and dissolved organic carbon was evaluated to better understand biogeochemical processes within the stream-lake interface.

Data

Historical digital orthophotos

Historical Orthoimagery of the Lake Tahoe Basin

The U.S. Geological Survey Western Geographic Science Center has developed a series of historical digital orthoimagery (HDO) datasets of the Lake Tahoe Basin. Three datasets are available: (A) 1940 HDOs for the southern Lake Tahoe Basin, (B) 1969 HDOs for the entire Lake Tahoe Basin, and (C) 1987 HDOs for the southern Lake Tahoe Basin. The HDOs were compiled photogrammically from aerial photography with varying scales, camera characteristics, image quality, and capture dates.

Data

Archived data in the Lake Tahoe Data Clearinghouse


Lake Tahoe bathymetry

Bathymetry

A bathymetric survey of Lake Tahoe in August 1998 was conducted by the USGS Pacific Coastal and Marine Science Center in cooperation with the Ocean Mapping Group of the University of New Brunswick, Canada to study the morphology and material of the lake floor. The multibeam mapping system used for the survey recorded bathymetric data (depth information) and the backscatter data (the strength of sound energy that bounces back). This information can help scientists identify the materials that make up the lake floor, such as rock, sand, or mud.

Report on the mapping process Images Data

Part of the DLG for the Lake Tahoe Basin

Digital Line Graph

A Digital Line Graph (DLG) is a digital vector representation of cartographic information derived from USGS maps and related sources. A DLG mosaic was created from 18 7.5-minute quadrangles that cover the Lake Tahoe Basin. The mosaic is a more convenient format to view areas of the basin or areas along the edge of two quadrangles. DLGs were created using a 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)

The Lake Tahoe Basin DEM was created from a mosaic of 18 7.5-minute quadrangles of 10-m DEMs and data collected on a 1988 bathymetric survey of the lake. DEMs were created using a UTM NAD27 zone 10 projection.

DEM without bathymetry DEM with bathymetry Hillshade JPEG

Part of the DOQ for the Lake Tahoe Basin

Digital Orthophoto Quadrangle (DOQ)

Lake Tahoe Basin imagery is available as individual or mosaicked DOQs. A standard DOQ covers a quarter section of a 7.5-minute quadrangle. The one meter resolution of the quarter section DOQ results in a very large file size, about 50 megabytes (MB) and the complete mosaicked DOQ file size is about 3 gigabytes (GB). The DOQs for the Lake Tahoe Basin were mosaicked using multiresolution seamless image database (MrSID) compression and a .sid file format. DOQs were 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

Scanned USGS 7.5 minute quadrangles for the Lake Tahoe Basin are available as individual or mosaicked Digital Raster Graphic (DRG) images. DRG TIFF images are of lower resolution and smaller file size than DOQs; the Lake Tahoe Basin mosaic is about 81 MB in size. Eighteen USGS 7.5-minute topographic maps were mosaicked using multiresolution seamless image database (MrSID) compression and a .sid file format. DRGs were created using UTM NAD27 zone 10 projection.

GeoTiff MrSID

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