Metadata Updated: November 12, 2020

This raster dataset represents aspect in units of degrees ranging 0 to 359 (0 being north) and a value of -1 represents flat areas where aspect is undefined. Aspect computed using the ArcGIS Spatial Analyst Aspect tool, processes raster elevation data using a 3x3 neighbor window. The resulting aspect is computed as "grid north" where the upper middle cell of the 3x3 window is considered as north. To address this issue, an analysis was performed to create a deviation grid for the area covered by the elevation dataset. This deviation grid was used to adjust the output from the aspect tool and create a new aspect grid that correctly represents true north. The corrected aspect dataset was derived from source elevation data with floating point precision. Users of the associated LandFire DEM dataset (integer precision) may notice that the aspect derived from that dataset differs from this dataset. This difference of aspect is due to the differences in vertical precision of the source elevation and also because the values have been adjusted to account for the Albers projection. The Landfire project has specific requirements that mandate that this dataset contain data values rounded to the nearest integer for all the cells designated in the mask that was provided. However, there are cells in the masked region for which there is no elevation data available. These cells were coded with a value of -9999 to designate that no data was available.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Date September 9, 2009
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) January 1, 1999 (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from DOI Open Data

Additional Metadata

Resource Type Dataset
Metadata Date September 9, 2009
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) January 1, 1999 (publication)
Responsible Party SGT Contractor to the USGS National Center for Earth Resources Observation and Science (Point of Contact)
Contact Email
Access Constraints Use Constraints: None. Acknowledgement of the originating agencies would be appreciated in products derived from these data., Access Constraints: None
Bbox East Long -153.3681839910366
Bbox North Lat 25.17246703156623
Bbox South Lat 18.112857617393107
Bbox West Long -160.47454578543605
Coupled Resource
Frequency Of Update asNeeded
Licence Although these data have been processed successfully on a computersystem at the U.S. Geological Survey, EROS Data Center, no warrantyexpressed or implied is made by either regarding the utility of thedata on any system, nor shall the act of distribution constitute anysuch warranty. The USGS will warrant the delivery of this product incomputer-readable format and will offer appropriate adjustment ofcredit when the product is determined unreadable by correctly adjustedcomputer peripherals, or when the physical medium is delivered indamaged condition. Requests for adjustments of credit must be madewithin 90 days from the date of this shipment from the ordering site.
Metadata Language
Metadata Type geospatial
Progress underDevelopment
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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