USGS Contours for Crescent W, Oregon 20121105 1 x 1 degree FileGDB 10.1

Resource lineage description

source

source description  Source Contribution: ImageSource Type digital data

representative resolution scale:

Scale denominator: 24000

source citation

Title Orthoimagery

publication  Date   2010-08-23

presentationForm  RASTER DIGITAL DATA OR DIGITAL ORTHORECTIFIED IMAGE OR NAIP DIGITAL ORTHO PHOTO IMAGE

other Citation Details  An orthorectified image is a layer in every product and is provided by the USDA-FSA-APFO from the National Agriculture Image Program (NAIP). This offers the USGS a nationally consistent image product, normally with a one meter resolution in natural color.

cited responsible party - originator

organisation Name  National Agriculture Image Program (NAIP) administered by the Aerial Photography Field Office (APFO) for the United States Department of Agriculture.

cited responsible party -

organisation Name  

Contact information

Linkage for online resource

URL: http://www.fsa.usda.gov/

source

source description  Source Contribution: Geographic feature namesSource Type digital data

representative resolution scale:

Scale denominator: 24000

source citation

Title Geographic Names Information System (GNIS)

publication  Date   2012-01-01

presentationForm  mapDigital

other Citation Details  The Geographic Names Information System (GNIS) is the Federal and national standard for geographic nomenclature. The U.S. Geological Survey developed the GNIS in support of the U.S. Board on Geographic Names as the official repository of domestic geographic names data, the official vehicle for geographic names use by all departments of the Federal Government, and the source for applying geographic names to Federal electronic and printed products.

cited responsible party - originator

organisation Name  U.S. Geological Survey

cited responsible party -

organisation Name  

Contact information

Linkage for online resource

URL: http://geonames.usgs.gov/

source

source description  Source Contribution: ContoursSource Type digital data

representative resolution scale:

Scale denominator: 24000

source citation

Title Hypsography

publication  Date   2002-04-01

presentationForm  mapDigital

other Citation Details  This contour featureclass was generated from the 1/3 arc-second version of the National Elevation Dataset (NED). The intended viewing scale for these features is 1:24,000. The contours are derived from a filtered elevation raster to achieve smoother arcs. The NED data were modified by the National Hydrography Dataset (NHD) flow lines and water bodies to facilitate improved integration between the hypsography and hydrography on USGS map products. These contours were generated primarily for use as a layer in GeoPDFs created in the digital mapping program. The raster data source of contours is the National Elevation Dataset (NED) 1/3 arc-second layer. The 1/3 arc-second NED contains resampled data from the 1/9 arc-second layer of NED. Secondary datasets include the high resolution flow lines, water bodies, and areas from the National Hydrography Dataset (NHD). The NHD layers are used in hydro-enforcement of the DEM prior to contour generation. The goals of the hydro-enforcement are to prevent contour lines from extending over the surface of water bodies and to align the contour reentrants with the NHD single-line streams. The NED raster cells are converted to points. Those points, along with the NHD flow lines are input into an interpolation tool to create a new surface. The NHD water bodies and areas are preprocessed to attach the minimum and maximum elevation to each polygon. From these precalculated values, an appropriate value is calculated by which to raise the elevation cells under the NHD polygons. The NHD polygons are then converted into rasters, which in turn will be used to generate a mosaic that includes the new raster surface. The mosaic is filtered to provide smoother contour lines. Contours are generated and depression and index contours are identified. There is no guarantee or warranty concerning the accuracy of the data. Users should be aware that temporal changes may have occurred since these data were collected and generated and that some parts of these data may no longer represent actual surface conditions. Hydro-enforcement and generalization can also significantly alter the spatial characteristics of the contours. Users should not use these data for critical applications without a full awareness of its limitations.

cited responsible party - originator

organisation Name  USGS - National Elevation Dataset is a component of a comprehensive base geospatial data model.

cited responsible party -

organisation Name  

Contact information

Linkage for online resource

URL: http://ned.usgs.gov/

source

source description  Source Contribution: National Elevation DatasetSource Type digital data

representative resolution scale:

Scale denominator: 24000

source citation

Title Shaded Relief

publication  Date   2002-04-01

presentationForm  mapDigital

other Citation Details  The Shaded relief is a derivative elevation product created from the National Elevation Dataset (NED) 1/3 arc second. First there are five separate shaded relief datasets created from the original data. Each shaded relief has different azimuths and altitude values as follows: 00 450, 1350 600, 2700 450, 3150 450, 450 450. These five datasets are then combined into one feature class using map algebra to compute the raster layers using the following equation shadedrelief1 + shadedrelief2 + shadedrelief3 + (shadedrelief4 x 2) + shaded relief5 6. This equation gives double importance to the 3150 azimuth and 450 elevation.

cited responsible party - originator

organisation Name  U.S. Geological Survey

cited responsible party -

organisation Name  

Contact information

Linkage for online resource

URL: http://viewer.nationalmap.gov/viewer/nhd.html?p=nhd

AbsoluteExternalPositionalAccuracy

name Of Measure Horizontal Positional Accuracy Report

evaluation Method Description  This map product is compiled to meet National Map Accuracy Standards (NMAS). NMAS horizontal accuracy requires that at least 90 percent of well-defined points tested are within 0.02 inch of the true position. In this product, the projection line, grids, and orthoimage are believed to meet NMAS. Positional accuracy of the other data layers is less controllable because of diversity of data sources, and may not meet NMAS.

AbsoluteExternalPositionalAccuracy

name Of Measure Vertical Positional Accuracy Report

evaluation Method Description  The accuracy of the National Elevation Dataset (NED) is inherited from the source digital elevation models (DEMs). The overall absolute vertical accuracy expressed as the root mean square error (RMSE) is 2.44 meters. The measured vertical RMSE was converted to equivalent NMAS and NSSDA expressions. The accuracy is expressed in terms of the National Map Accuracy Standards (NMAS), which use a 90 percent confidence interval, and in terms of the National Standard for Spatial Data Accuracy (NSSDA), which uses a 95 percent confidence interval.

Completeness Commission

evaluation Method Description  Each layer is extracted from the USGS national geospatial databases.

Completeness Omission

evaluation Method Description  Each layer is extracted from the USGS national geospatial databases.

ConceptualConsistency

measure Description  This product is a set of ESRI layers. This design is based on use of specific commercial software systems therefore any changes to the software specifications and dependencies will be followed by the USGS and codified in the product standard.