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Hillshade Image of Wisconsin from 10-meter NED

Identification Information

Citation
Title
Hillshade Image of Wisconsin from 10-meter NED
Originator
Wisconsin Department of Natural Resources
Publication Date
2009-01-01
Geospatial Data Presentation Form
mapDigital
Collection Title
Statewide
Abstract
This Hillshade image is a raster representation of land elevation of Wisconsin, derived from the US Geological Survey's 10-meter National Elevation Dataset (NED). The NED is a seamless mosaic of best-available elevation data. The 7.5-minute elevation data for the conterminous United States are the primary initial source data. USGS developed processing methods to filter production artifacts in the existing data, convert to the NAD83 datum, edge-match, and fill slivers of missing data at quadrangle seams. One of the effects of the NED processing steps is a much-improved base of elevation data for calculating slope and hydrologic derivatives. The specifications for the NED 1 arc second (30 meter) and 1/3 arc second (10 meter) data are: Geographic coordinate system Horizontal datum of NAD83, except for AK which is NAD27; Vertical datum of NAVD88, except for AK which is NAVD29 Z units of meters
Purpose
Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications. Hillshading is useful for many cartographic visualizations, such as draping elevation or imagery.
Supplemental Information
WDNR obtained these USGS-produced NED 10-meter resolution data from MapMart, a division of Intrasearch, Inc., in July 2009. No spatial metadata from USGS was provided, so the data source, processing method, and resolution at the time MapMart obtained the data from USGS are not available. USGS continues to improve the NED 10m product, and provides shapefiles of spatial metadata when downloading the data. The NED data were mosaicked to cover Wisconsin, projected to WTM83(91), and clipped using a 5000 meter buffer of the state perimeter. Separate data sets of hillshading, percent slope, and slope aspect were derived. Additional terrain derivatives for hydrologic modelling or cartographic purposes may be produced in the future. After USGS completes the updates of the NED 10m product, it may be advisable to replace all of these layers. For information about the source USGS NED, see "The National Map - Elevation, Fact Sheet 2009-3053": http://pubs.usgs.gov/fs/2009/3053/ .
Temporal Extent
Currentness Reference
publication date
Time Instant
2009-01-01T00:00:00
Bounding Box
West
-93.169512
East
-86.460605
North
47.218179
South
42.317034
Bounding Box
West
-93.169512
East
-86.460605
North
47.218179
South
42.317034
ISO Topic Category
elevation
Place Keyword
Wisconsin
Place Keyword Thesaurus
Theme Keyword
Raster
Theme Keyword Thesaurus
FGDC
Theme Keyword
Land Surface
Topography
Landforms
Terrain
Elevation
Theme Keyword Thesaurus
Resource Constraints
Use Limitation
None. Acknowlegement of the originating agencies (USGS, WDNR) would be appreciated in products derived from these data.
Legal Constraints
Use Limitation
None
Status
underDevelopment
Maintenance and Update Frequency
unknown
Language
eng
Credit
Wisconsin Department of Natural Resources U.S. Geological Survey
Point of Contact
Contact
Wisconsin Department of Natural Resources
Delivery Point
101 S. Webster St.
City
Madison
Administrative Area
WI
Postal Code
53707
Country
US
Email
DNRGEOData@wisconsin.gov
Phone
608-264-8914

Spatial Reference Information

Reference System Identifier
Code
0
Code Space
Version

Data Quality Information

Absolute External Positional Accuracy
Lineage
Process Step
Description
see: http://ned.usgs.gov/Ned/methodology.asp "Processing Procedures: Development of the NED required the merging of over 50,000 different DEM data files. A processing system was designed to assemble a seamless dataset from multiple data sources, resolutions, and production methods. Procedures were developed to maintain the database with periodic updates and to insure the integration of higher resolution elevation data as they become available. A raster data model referenced to a geographic grid was used for NED. The data model is logically seamless but uses an internal tile structure initially selected as a 1- by 1-degree area. The NED dataset currently achieves complete national coverage by integrating the "best" available data in the USGS Sales Database database. Even with the "best" available, there could be a wide range of source dates and some artifacts in the source DEM. The NED assemble process identifies all existing DEM's available from data producers. The system filters production artifacts, and performs any necessary datum conversions and coordinate transformations. The NED data is only as good as the orginal source DEM. Individual DEM files are appended together into the larger tile structure specified for the database. Edge matching and metadata generation are applied lastly in assembling each NED tile. The specific procedures adopted and the issues addressed in building the NED are discussed in the following steps: Identification of Existing DEM's Datum and Elevation Conversions Projection Transformation and Resampling Artifact Corrections Merge of Multiple Data Sources Edge Matching" "Specifications: Technical Specifications Operational Specifications Business Specifications" WDNR mosaiced, projected, and clipped the data. A variety of .LYR files are available for rendering. The HILLSHADE was created using ArcView Spatial Analyst, using default settings. Azimuth is the angle of the light source. The azimuth is expressed in positive degrees from 0 to 360, measured clockwise from north.The default is 315 degrees. Altitude angle of the light source above the horizon. The altitude is expressed in positive degrees, with 0 degrees at the horizon and 90 degrees directly overhead. The default is 45 degrees. The output shaded relief raster only considers local illumination angles; the effects of shadows are not considered. The output raster contains values ranging from 0 to 255, with 0 representing the darkest areas, and 255 the brightest. The grid was reduced to integer values using the INT command.

Distribution Information

Format Name
Raster Dataset
Distributor
Wisconsin DNR, Burea of Technology Services
Online Access
https://gisdata.wisc.edu/public/WI_NED10mHillshade_2009.zip
Protocol
WWW:DOWNLOAD-1.0-http--download
Name
GeoData@Wisconsin
Function
download

Content Information

Content Type
image

Spatial Representation Information

Raster
Number of Dimensions
2
Row Count
53930
Column Count
50842
Cell Geometry Type
area
Corner Points
Point
279830.000000 210110.000000
Point
279830.000000 749410.000000
Point
788250.000000 749410.000000
Point
788250.000000 210110.000000
Center Point
534040.000000 479760.000000

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
46584515-1D7E-4B43-867E-91045B78EE51
Metadata Date Stamp
2019-07-02
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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