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Oregon 10m DEM

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Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey (USGS), EROS Data Center
Publication_Date: 1999
Title: Oregon 10m DEM
Edition: 1
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Sioux Falls, SD
Publisher: U.S. Geological Survey
Online_Linkage: \DAS-00919E$cd_swdem10sw
Description:
Abstract:
The USGS developed a national elevation dataset (NED). The NED is a seamless mosaic of best available elevation data. The 7.5 minute elevation data for the conterminous US are primarily initial source data. The 10 m dems for Oregon were merged whenever possible in there native UTM projection. The resulting file was projected into the Oregon Lambert projection and clipped into 9 seperate grids for the state of Oregon
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.
Supplemental_Information:
These tiles merges of the 10m DEMs for the state of Oregon in ESRI's ARC/INFO grid format They are in the Oregon Lambert Projection
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19990201
Beginning_Time: unknown
Ending_Date: unknown
Ending_Time: unknown
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -124.896200
East_Bounding_Coordinate: -117.01801421
North_Bounding_Coordinate: 46.14636144
South_Bounding_Coordinate: 41.629424
Keywords:
Theme:
Theme_Keyword_Thesaurus: EARTH SCIENCE
Theme_Keyword: EARTH SCIENCE
Theme_Keyword: LAND SURFACE
Theme_Keyword: TOPOGRAPHY
Theme_Keyword: LANDFORMS
Theme_Keyword: TERRAIN ELEVATION
Theme_Keyword: 1-DEGREE DEM
Theme_Keyword: 2-ARC-SECOND DEM
Theme_Keyword: 7.5-MINUTE DEM
Theme_Keyword: CARTOGRAPHY
Theme_Keyword: DEM
Theme_Keyword: DIGITAL ELEVATION MODEL
Theme_Keyword: DIGITAL MAPPING
Theme_Keyword: EDC
Theme_Keyword: EROS
Theme_Keyword: GEODATA
Theme_Keyword: GIS
Theme_Keyword: MAPPING
Theme_Keyword: RASTER
Theme_Keyword: USGS
Theme_Keyword: OREGON
Theme_Keyword: 10 METER
Theme_Keyword: OREGON LAMBERT PROJECTION
Place:
Place_Keyword_Thesaurus: GCMD Location Keywords
Place_Keyword: OREGON
Place_Keyword: NORTH AMERICA
Place_Keyword: UNITED STATES
Place_Keyword: UNITED STATES OF AMERICA
Access_Constraints: None
Use_Constraints:
None. Acknowledgement of the originating agencies (USGS) would be appreciated in products derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Oregon Geospatial Data Clearinghouse
Contact_Position: Data Administrator
Contact_Address:
Address_Type: mailing address
Address: 955 Center ST. NE RM 470
City: SALEM
State_or_Province: OR
Postal_Code: 97301
Country: USA
Contact_Voice_Telephone: 503-378-2166
Contact_Electronic_Mail_Address: gis@web1.css.das.state.or.us
Data_Set_Credit:
USGS, Oregon Geospatial Data Clearinghouse and the Oregon Department of Environmental Quality (DEQ).
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 3; ESRI ArcCatalog 8.1.2.671
Cross_Reference:
Citation_Information:
Originator: U.S. Geological Survey (USGS), EROS Data Center
Publication_Date: 1999
Title: National Elevation Dataset - Oregon 10 m DEM
Edition: 1
Geospatial_Data_Presentation_Form: raster digital data
Data_Quality_Information:
Logical_Consistency_Report: Checked with ARC/INFO GRID
Completeness_Report:
In this version, quads for 41 degrees north are not included. This creates slivers of no data along the Oregon border.
Lineage:
Process_Step:
Process_Description:
The original 10m DEM files (in .dem format) by quad sheet were obtained from the Oregon Geographical Data Clearinghouse from the BLM and/or USGS Processing had the added challenge of addressing the UTM projection "break" at the 120 degrees west longitude line. The DEMs were merged as far as possible in their native UTM projection to minimize border slivers.

All processing was done in ESRI's ARC/INFO and GRID module. The ARC/INFO "demgrid" command was used to convert each DEM quad sheet to grid format.

If necessary, z-units in feet in the original file were converted, using the GRID "con" command, dem_in_meters = con(dem_in-feet > 3,dem_in_feet/3.28,1), to convert to meters to match all other sheets. The sheets converted are: 45121e8 45121f8 45121f7 45121f6 45121f5 45121f4 45122e1 45122e2 45122e3 45122e4 45122e5 45122e6 45122f7 45122f8

If necessary, the GRID "int" command, dem_integer = int(dem_floating + .5), was used to convert any floating point grids to integer grids.

Individual tiles were then merged, into 1 degree wide swaths in their original UTM projection , swath = merge(list of quads). For 116, 117, 118, and 119 degrees west this is UTM 11, NAD 27; for 120, 121, 122, 123 , and 124 degrees west this is UTM 10, NAD 27.

The swaths of each projection system were merged.

The UTM 11 half was projected into UTM 10. At 10m resolution, the DEMs are too large to merge into a single statewide grid. The state is subdivided into 9 tiles for processing and data exchange. The polygons defining these tiles were buffered 100 meters (buffer tile tile_buffer # # 100 # poly). The resultant buffer polygons were then used to clip the two merged grids. The 120 degree and west DEM grid was clipped with the northwest, west, and southwest tile buffers and the 120 degree and east DEM grid was clipped with the northeast, east and southeast tile buffers. The center set of buffers (north, center, and south) straddle the 120 degree west longtitude line. Both the 120 degree west DEM and 120 degree east DEM were clipped with those center buffer polygons. The resultant halves were then merged into complete north, center and south tiles.

Each grid tile was projected from UTM into the state standard lambert projection for Oregon using the ARC/INFO "project grid" command with bilinear transformation.

The final processing step involved converting the z-units from meters to feet and converting back to an integer grid.

Process_Date: 20020124
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 18732
Column_Count: 24662
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Conformal Conic
Lambert_Conformal_Conic:
Standard_Parallel: 43.000000
Standard_Parallel: 45.500000
Longitude_of_Central_Meridian: -120.500000
Latitude_of_Projection_Origin: 41.750000
False_Easting: 1312336.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 32.828670
Ordinate_Resolution: 32.828670
Planar_Distance_Units: User_Defined_Unit
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
 
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview: Values - z -value in feet (range varies between tiles
Entity_and_Attribute_Detail_Citation: USGS 10 M DEM web page
 
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Oregon Geospatial Data Clearinghouse (OGDC)
Contact_Person: Data Administrator
Contact_Position: Data Administrator
Contact_Address:
Address_Type: mailing address
Address: 955 Center ST NE Rm 470
City: Salem
State_or_Province: OR
Postal_Code: 97301
Country: USA
Contact_Voice_Telephone: 503-378-2166
Contact_Electronic_Mail_Address: gis@web1.css.das.state.or.us
Distribution_Liability:
The OGDC and the State of Oregon assume no libality for the GIS product
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARC/INFO GRID
Format_Version_Number: 8.1
Format_Specification: ARC/INFO GRID
Format_Information_Content: ARC/INFO GRID
File_Decompression_Technique: zip
Transfer_Size: 517.993
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://buccaneer.geo.orst.edu/dem/>
Fees: None if download digitally
 
Metadata_Reference_Information:
Metadata_Date: 20021219
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Oregon Geospatial Data Clearinghouse (OGDC)
Contact_Person: Data Administrator
Contact_Position: Data Administrator
Contact_Address:
Address_Type: mailing address
Address: 955 Center St. NE Rm. 470
City: Salem
State_or_Province: OR
Postal_Code: 97301
Country: USA
Contact_Voice_Telephone: 503-378-2166
Contact_Electronic_Mail_Address: gis@web1.css.das.state.or.us
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Access_Constraints: None
Metadata_Use_Constraints: None
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.7.3 on Tue Jan 14 13:53:05 2003

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Maintained by: Jon Jablonski, jonjab@uoregon.edu
Last Modified: 08/11/2006