Bare earth digital elevation model (DEM) from 2011 LiDAR, Blue River Watershed

Raster Dataset

Thumbnail

Tags
USFS, Oregon, LiDAR, bare earth, Linn County, digital terrain model, EPA, bare ground, Light Detection and Ranging, Pacific Northwest, Blue River, elevation data, topography, high-resolution, DEM, Lane County


Summary

Provide high resolution terrain elevation and land cover elevation data.

Description

This dataset represents the Blue River Watershed survey area in Linn and Lane County, OR. This bare earth digital elevation model (DEM) represent the earth's surface with all vegetation and human-made structures removed. The bare earth DEMs were derived from LiDAR data using TIN processing of the ground point returns. The DEM grid cell size is 1 meter. The elevation units are in meters. Some elevation values have been interpolated across areas in the ground model where there is no elevation data (e.g. over water, over dense vegetation). Watershed Sciences, Inc. collected the LiDAR and created this data set for the EPA and USFS.

Credits

Use limitations

In some areas of heavy vegetation or forest cover, there may be relatively few ground points in the LiDAR data. TINing the points produces large triangles and hence the elevations may be less accurate within such areas. Elevation values for open water surfaces are not valid elevation values because few LiDAR points are returned from water surfaces. Triangles were created across water surfaces by interpolating from the nearest land points.

Extent

West  -122.334155    East  -122.129467
North  44.340085    South  44.202966

Scale Range
Maximum (zoomed in)  1:5,000
Minimum (zoomed out)  1:150,000,000

ArcGIS Metadata 

Topics and Keywords 

Themes or categories of the resource  elevation


*Content type  Downloadable Data
Export to FGDC CSDGM XML format as Resource Description No

Place keywords  Oregon, Linn County, Pacific Northwest, Blue River, Lane County

Theme keywords  USFS, LiDAR, bare earth, digital terrain model, EPA, bare ground, Light Detection and Ranging, elevation data, topography, high-resolution, DEM

Citation 

Title Bare earth digital elevation model (DEM) from 2011 LiDAR, Blue River Watershed
Creation date 2011-11-01 00:00:00
Publication date 2012-01-31 00:00:00


Presentation formats* digital map


Other citation details gi01101.zip


Citation Contacts 

Responsible party
Organization's name Oregon State University College of Forestry
Individual's name Forest Science Data Bank
Contact's role  publisher


Contact information
Address
Type
Delivery point 3200 SW Jefferson Way
City Corvallis
Administrative area OR
Postal code 97331



Responsible party
Organization's name Watershed Sciences, Inc.
Individual's name Watershed Sciences, Inc.
Contact's role  originator


Contact information
Phone
Voice 541-752-1204

Address
Type both
Delivery point 517 SW 2nd Ave.
City Corvallis
Administrative area OR
Postal code 97333
Country US
e-mail address watershedsciences.com



Resource Details 

Dataset languages  English (UNITED STATES)
Dataset character set  utf8 - 8 bit UCS Transfer Format


Status  completed
Spatial representation type* grid


Supplemental information
The dataset is projected in UTM Zone 10N, meters
*Processing environment Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.1.1.3300


ArcGIS item properties
*Name be_bluerivws
*Location file://P:\HJA_LIDAR\blue_river\Rasters\bare_earth\be_bluerivws
*Access protocol Local Area Network

Extents 

Extent
Description
date of LiDAR flight
Geographic extent
Bounding rectangle
Extent type  Extent used for searching
*West longitude -122.334155
*East longitude -122.129467
*North latitude 44.340085
*South latitude 44.202966
*Extent contains the resource Yes

Temporal extent
Beginning date 2011-10-27 00:00:00
Ending date 2011-11-01 00:00:00

Extent in the item's coordinate system
*West longitude 553200.000000
*East longitude 569396.000000
*South latitude 4894783.000000
*North latitude 4909863.000000
*Extent contains the resource Yes

Resource Points of Contact 

Point of contact
Individual's name Theresa Valentine
Organization's name Corvallis Forest Science Laboratory
Contact's position Spatial Information Manager
Contact's role  point of contact


Contact information
Phone
Voice 541-750-7333
Fax 541-758-7760

Address
Type both
Delivery point 3200 SW Jefferson Way
City Corvallis
Administrative area Oregon
Postal code 97332
Country US
e-mail addresstvalentine@fs.fed.us or theresa.valentine@orst.edu

Hours of service m-f 8:00am-4:00pm


Resource Maintenance 

Resource maintenance
Update frequency  not planned


Resource Constraints 

Constraints
Limitations of use
In some areas of heavy vegetation or forest cover, there may be relatively few ground points in the LiDAR data. TINing the points produces large triangles and hence the elevations may be less accurate within such areas. Elevation values for open water surfaces are not valid elevation values because few LiDAR points are returned from water surfaces. Triangles were created across water surfaces by interpolating from the nearest land points.

Spatial Reference 

ArcGIS coordinate system
*Type Projected
*Geographic coordinate reference GCS_North_American_1983
*Projection NAD_1983_UTM_Zone_10N
*Coordinate reference details
Projected coordinate system
Well-known identifier 26910
X origin -5120900
Y origin -9998100
XY scale 450445547.3910538
Z origin -100000
Z scale 10000
M origin -100000
M scale 10000
XY tolerance 0.001
Z tolerance 0.001
M tolerance 0.001
High precision true
Latest well-known identifier 26910
Well-known text PROJCS["NAD_1983_UTM_Zone_10N",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-123.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",26910]]

Reference system identifier
*Value 26910
*Codespace EPSG
*Version 7.11.2


Spatial Data Properties 

Georectified Grid
*Number of dimensions 2


Axis dimensions properties
Dimension type  column (x-axis)
*Dimension size 16196
*Resolution  1.000000 Meter

Axis dimensions properties
Dimension type  row (y-axis)
*Dimension size 15080
*Resolution  1.000000 Meter

*Cell geometry  area
*Point in pixel  center


*Transformation parameters are available Yes


*Check points are available No


Corner points
*Point 553200.000000 4894783.000000
*Point 553200.000000 4909863.000000
*Point 569396.000000 4909863.000000
*Point 569396.000000 4894783.000000

*Center point 561298.000000 4902323.000000




ArcGIS Raster Properties
General Information
*Pixel depth 32
*Compression type RLE
*Number of bands 1
*Raster format GRID
*Source type continuous
*Pixel type floating point
*No data value -3.4028235e+038
*Has colormap No
*Has pyramids Yes




Spatial Data Content 

Image Description
*Type of information  physical measurement
Attribute described by cell values one meter elevation grid


Band information
*Description be_bluerivws
*Maximum value 1631.800049
*Minimum value 401.399994
Units
Symbol m

*Number of bits per value 32


Image quality code
Value n/a


Processing level code
Value n/a


Triangulation has been performed No
Radiometric calibration is available No
Camera calibration is available No
Film distortion information is available No
Lens distortion information is available No


Data Quality 

Scope of quality information
Resource level  dataset




Data quality report - Absolute external positional accuracy
Dimension horizontal


Measure description LiDAR flight lines have been examined to ensure that there was at least 50% sidelap, there are no gaps between flightlines, and overlapping flightlines have consistent elevation values. Shaded relief images have been visually inspected for data errors such as pits, border artifacts, gaps, and shifting. The data was examined at a 1:2000 scale. LiDAR data has been collected and processed to the extent of the boundary shapefile provided.


Standard procedure identifier
Value none


Quantitative test results
Value GT 50
Units
Symbol %

Value type percent coverage
Evaluation type  direct external
Evaluation method flight overlap and extent greater than 50 percent.




Data quality report - Absolute external positional accuracy
Dimension vertical


Measure description Root Mean Square Error


Standard procedure identifier
Value root mean square error


Quantitative test results
Value  0.052
Units
Symbol m

Value type RMSE
Evaluation type  direct external
Evaluation method The Root Mean Square Error (RMSE) of the data set is 0.052 meters. Accuracy was assessed using 419 ground survey RTK (real time kinematic) points. Please see LiDAR data report for a discussion of statistics related to these datasets.




Lineage 

Process step
When the process occurred 2011-11-01 00:00:00
Description Acquisition. The LiDAR data was collected on October 27, 28 and November 1, 2011. The survey used a Leica ALS60ii laser system mounted in a Cessna Caravan 208B. Near nadir scan angles were used to increase penetration of vegetation to ground surfaces. Ground level GPS and aircraft IMU were collected during the flight.


Process contact
Organization's name Watershed Sciences, Inc.
Contact's role  processor


Contact information
Phone
Voice 541-752-1204

Address
Type postal
Delivery point 517 SW 2nd Ave.
City Corvallis
Administrative area OR
Postal code 97333
Country US
e-mail address watershedsciences.com





Process step
When the process occurred 2011-12-01 00:00:00
Description Processing. 1. Flight lines and data were reviewed to ensure complete coverage of the study area and positional accuracy of the laser points. 2. Laser point return coordinates were computed using ALS Post Processor software, IPAS Pro GPS/INS software, and Waypoint GPS, based on independent data from the LiDAR system, IMU, and aircraft. 3. The raw LiDAR file was assembled into flight lines per return with each point having an associated x, y, and z coordinate. 4. Visual inspection of swath to swath laser point consistencies within the study area were used to perform manual refinements of system alignment. 5. Custom algorithms were designed to evaluate points between adjacent flight lines. Automated system alignment was computed based upon randomly selected swath to swath accuracy measurements that consider elevation, slope, and intensities. Specifically, refinement in the combination of system pitch, roll and yaw offset parameters optimize internal consistency. 6. Noise (e.g., pits and birds) was filtered using ALS postprocessing software, based on known elevation ranges and included the removal of any cycle slips. 7. Using TerraScan and Microstation, ground classifications utilized custom settings appropriate to the study area. 8. The corrected and filtered return points were compared to the RTK ground survey points collected to verify the vertical and horizontal accuracies. 9. Points were output as laser points, TINed and GRIDed surfaces.


Process contact
Organization's name Watershed Sciences, Inc.
Contact's role  originator




Distribution 

Distributor
Contact information
Organization's name Forest Science Data Bank
Individual's name Forest Science Data Bank
Contact's role  distributor


Contact information
Phone
Voice n/a

Address
Type both
Delivery point 3200 SW Jefferson Way
City Corvallis
Administrative area OR
Postal code 97331
Country US

Contact instructions
visit the website @ http://andrewsforest.oregonstate.edu/lter/data/metadata.cfm?topnav=115




Distributor
Contact information
Individual's name Theresa Valentine
Organization's name Corvallis Forest Science Laboratory
Contact's position Spatial Information Manager
Contact's role  distributor


Contact information
Phone
Voice 541-750-7333
Fax 541-758-7760

Address
Type both
Delivery point 3200 SW Jefferson Way
City Corvallis
Administrative area Oregon
Postal code 97332
Country US
e-mail addresstvalentine@fs.fed.us or theresa.valentine@orst.edu

Hours of service m-f 8:00am-4:00pm




Distribution format
*Name Raster Dataset
Version arcGIS 10.1


Transfer options
Units of distribution zip file


Online source
Locationhttp://andrewsforest.oregonstate.edu/data/studies/spatialdata/gi01101.zip
Access protocol zip file
Function performed  download

Fields 

Details for object b_bluerivws 
Type raster
Definition
raster data set
Definition source
source


Field value
 
Data type floating point
Width 20
Field description
elevation above sea level in meters
Description source
source
Description of values continuous domain values calculated by computer program






References 

Aggregate Information
Association type  cross reference


Aggregate resource name
Title LIDAR REMOTE SENSING DATA COLLECTION: BLUE RIVER WATERSHED, OR
Creation date 2012-01-31 00:00:00


Responsible party
Organization's name Watershed Sciences, Inc.
Contact's role  point of contact


Contact information
Phone
Voice 541-752-1204

Address
Type postal
Delivery point 517 SW 2nd Ave.
City Corvallis
Administrative area OR
Postal code 97333
Country US
e-mail address watershedsciences.com



Resource location online
Locationhttp://andrewsforest.oregonstate.edu/lter/data/aerial/Blue_River_LiDAR_Report.pdf
Function performed  download



Metadata Details 

Metadata language English (UNITED STATES)
Metadata character set  utf8 - 8 bit UCS Transfer Format


Scope of the data described by the metadata  dataset
Scope name* dataset


*Last update 2014-10-20


ArcGIS metadata properties
Metadata format ArcGIS 1.0
Standard or profile used to edit metadata FGDC


Created in ArcGIS for the item 2012-01-20 16:28:47
Last modified in ArcGIS for the item 2014-10-20 11:07:44


Automatic updates
Have been performed Yes
Last update 2014-10-20 11:07:44


Metadata Contacts 

Metadata contact
Individual's name Theresa Valentine
Organization's name Corvallis Forest Science Laboratory
Contact's position Spatial Information Manager
Contact's role  point of contact


Contact information
Phone
Voice 541-750-7333
Fax 541-750-7760

Address
Type both
Delivery point 3200 SW Jefferson Way
City Corvallis
Administrative area Oregon
Postal code 97332
Country US
e-mail addresstvalentine@fs.fed.us or theresa.valentine@orst.edu

Hours of service m-f 0800-1630


Thumbnail and Enclosures 

Thumbnail
Thumbnail type  JPG

Enclosure
Enclosure type  File
Description of enclosure original metadata
Original metadata document, which was translated yes
Source metadata format fgdc

FGDC Metadata (read-only) 

Identification 

Citation
Citation Information
OriginatorWatershed Sciences, Inc.
Publication DateJanuary, 2012
Title
Bare earth digital elevation model (DEM) from 2011 LiDAR, Blue River Watershed
Geospatial Data Presentation Formraster digital data
Online Linkage\\WINXP\F$\Blue_river\Deliverables_USFS\Rasters\bare_earth\be_bluerivws

Description
Abstract
This dataset represents the Blue River Watershed survey area in Linn and Lane County, OR. This bare earth digital elevation model (DEM) represent the earth's surface with all vegetation and human-made structures removed. The bare earth DEMs were derived from LiDAR data using TIN processing of the ground point returns. The DEM grid cell size is 1 meter. The elevation units are in meters. Some elevation values have been interpolated across areas in the ground model where there is no elevation data (e.g. over water, over dense vegetation). Watershed Sciences, Inc. collected the LiDAR and created this data set for the EPA and USFS.
Purpose
Provide high resolution terrain elevation and land cover elevation data.
Supplemental Information
The dataset is projected in UTM Zone 10N, meters
Time Period of Content
Time Period Information
Multiple Dates/Times
Single Date/Time
Calendar Date10/27/2011
Single Date/Time
Calendar Date10/28/2011
Single Date/Time
Calendar Date11/01/2011
Currentness Reference
ground condition
Status
ProgressComplete
Maintenance and Update FrequencyNone planned

Spatial Domain
Bounding Coordinates
West Bounding Coordinate-122.334155
East Bounding Coordinate-122.129467
North Bounding Coordinate44.340085
South Bounding Coordinate44.202966

Keywords
Theme
Theme KeywordUSFS
Theme KeywordLiDAR
Theme Keywordbare earth
Theme Keyworddigital terrain model
Theme KeywordEPA
Theme Keywordbare ground
Theme KeywordLight Detection and Ranging
Theme Keywordelevation data
Theme Keywordtopography
Theme Keywordhigh-resolution
Theme KeywordDEM

Place
Place KeywordPacific Northwest
Place KeywordOregon
Place KeywordBlue River
Place KeywordLinn County
Place KeywordLane County

Access Constraints
None
Use Constraints
In some areas of heavy vegetation or forest cover, there may be relatively few ground points in the LiDAR data.  TINing the points produces large triangles and hence the elevations may be less accurate within such areas.

Elevation values for open water surfaces are not valid elevation values because few LiDAR points are returned from water surfaces.  Triangles were created across water surfaces by interpolating from the nearest land points.
Point of Contact
Contact Information
Contact Organization Primary
Contact OrganizationUSDA Forest Service
Contact PersonCraig Creel
Contact Address
Address Typemailing address
Address3200 SW Jefferson Way
CityCorvallis
State or ProvinceOR
Postal Code97331
CountryUNITED STATES

Contact Voice Telephone541.750.7326
Contact Electronic Mail Addressccreel@fs.fed.us

Native Data Set Environment
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000

Data Quality 

Logical Consistency Report
LiDAR flight lines have been examined to ensure that there was at least 50% sidelap, there are no gaps between flightlines, and overlapping flightlines have consistent elevation values.

Shaded relief images have been visually inspected for data errors such as pits, border artifacts, gaps, and shifting.  The data was examined at a 1:2000 scale.
Completeness Report
LiDAR data has been collected and processed to the extent of the boundary shapefile provided.
Positional Accuracy
Horizontal Positional Accuracy
Quantitative Horizontal Positional Accuracy Assessment
Horizontal Positional Accuracy Explanation
See LiDAR data report.
Vertical Positional Accuracy
Quantitative Vertical Positional Accuracy Assessment
Vertical Positional Accuracy ValueRMSE = 0.052 meters
Vertical Positional Accuracy Explanation
The Root Mean Square Error (RMSE) of the data set is 0.052 meters.  Accuracy was assessed using 419 ground survey RTK (real time kinematic) points.  Please see LiDAR data report for a discussion of statistics related to these datasets.
Lineage
Process Step
Process Description
Acquisition.

The LiDAR data was collected on October 27, 28 and November 1, 2011.   The survey used a Leica ALS60ii laser system mounted in a Cessna Caravan 208B.  Near nadir scan angles were used to increase penetration of vegetation to ground surfaces.   Ground level GPS and aircraft IMU were collected during the flight.


Process Step
Process Description
Processing.

1. Flight lines and data were reviewed to ensure complete coverage of the study area and positional accuracy of the laser points.
2. Laser point return coordinates were computed using ALS Post Processor software, IPAS Pro GPS/INS software, and Waypoint GPS, based on independent data from the LiDAR system, IMU, and aircraft.
3. The raw LiDAR file was assembled into flight lines per return with each point having an associated x, y, and z coordinate.
4. Visual inspection of swath to swath laser point consistencies within the study area were used to perform manual refinements of system alignment.
5. Custom algorithms were designed to evaluate points between adjacent flight lines.  Automated system alignment was computed based upon randomly selected swath to swath accuracy measurements that consider elevation, slope, and intensities.  Specifically, refinement in the combination of system pitch, roll and yaw offset parameters optimize internal consistency.
6. Noise (e.g., pits and birds) was filtered using ALS postprocessing software,  based on known elevation ranges and included the removal of any cycle slips.
7. Using TerraScan and Microstation, ground classifications utilized custom settings appropriate to the study area.
8. The corrected and filtered return points were compared to the RTK ground survey points collected to verify the vertical and horizontal accuracies.
9.  Points were output as laser points, TINed and GRIDed surfaces.


Spatial Data Organization 

Direct Spatial Reference MethodRaster


Raster Object Information
Raster Object TypeGrid Cell
Row Count15080
Column Count16196
Vertical Count1

Spatial Reference 

Horizontal Coordinate System Definition
Planar
Planar Coordinate Information
Planar Coordinate Encoding Methodrow and column
Coordinate Representation
Abscissa Resolution1.000000
Ordinate Resolution1.000000
Planar Distance Unitsmeters

Geodetic Model
Horizontal Datum NameNorth American Datum of 1983
Ellipsoid NameGeodetic Reference System 80
Semi-major Axis6378137.000000
Denominator of Flattening Ratio298.257222

Entities and Attributes 

Detailed Description
Entity Type
Entity Type Labelb_bluerivws
Entity Type Definition
raster data set
Entity Type Definition Sourcesource

Attribute
Attribute Labelvalue
Attribute Definition
elevation above sea level in meters
Attribute Definition Sourcesource
Attribute Domain Values
Unrepresentable Domain
continuous domain values calculated by comptuer program

Distribution Information 

Distributor
Contact Information
Contact Organization Primary
Contact OrganizationUSDA Forest Service
Contact PersonCraig Creel
Contact Address
Address3200 SW Jefferson Way
CityCorvallis
State or ProvinceOR
Postal Code97331
CountryUNITED STATES

Contact Voice Telephone541.750.7326
Contact Electronic Mail Addressccreel@fs.fed.us

Resource DescriptionDownloadable Data
Standard Order Process
Digital Form
Digital Transfer Information
Transfer Size943.664

Metadata Reference 

Metadata Date2012-01-24
Metadata Contact
Contact Information
Contact Organization Primary
Contact OrganizationWatershed Sciences, Inc.
Contact PersonREQUIRED: The person responsible for the metadata information.
Contact Address
Address Typemailing address
Address517 SW 2nd Ave.
CityCorvallis
State or ProvinceOR
Postal Code97333
CountryUNITED STATES

Contact Voice Telephone541-752-1204
Contact Electronic Mail Addresswatershedsciences.com

Metadata Standard NameFGDC Content Standards for Digital Geospatial Metadata
Metadata Standard VersionFGDC-STD-001-1998
Metadata Time Conventionlocal time