Vegetation Height digital elevation model (DEM) from 2011 LiDAR, Blue River Watershed

Raster Dataset

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


Summary

The LiDAR lazer returns were processed into a representation of the topography of the area of interest with the first returns, also known as the "Highest Hits Digital Elevation Model (DEM)l". The base or bare-earth DEM values were subtracted from the first returns, witht he resulting raster being the height of any vegetation in the area of interest. Values are in meters. The final product is in ESRI GRID digital format, with a 1 meter cell size resolution. Each cell in the GRID has a value that represents the modeled vegetation height at that location. The purpose of the data is to provide users with a very accurate view of the vegetation height of the study area. The data are suitable for creating visualizations, identifying different layers of vegetation, calculataing biomass, and determining crown diameter, tree density, numbers of trees and their relationships to eachother. It is also possible to observe management activities (clear-cutting) and vegetation in meadows.

Description

This dataset represents the Blue River Watershed survey area in Linn and Lane County, OR. The highest hit digital surface models (DSM) represent the earth's surface with all vegetation and human-made structures included. The highest hit DSMs were derived from LiDAR data using the highest hit method. The DSM 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, environment


* 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, Landscape Ecology, vegetation, LiDAR, digital terrain model, EPA, Light Detection and Ranging, elevation data, topography, high-resolution, DEM, GIS

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Citation  ▼►

Title Vegetation Height 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 gi01103.zip


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Citation Contacts  ▼►

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


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 
Delivery point 3200 SW Jefferson Way
City Corvallis
Administrative area OR
Postal code 97331

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Resource Details  ▼►

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


Status  completed
Spatial representation type  * grid


Supplemental information
This 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 vh_bluerivws
* Location file://P:\HJA_LIDAR\blue_river\Rasters\veg_height\vh_bluerivws
* Access protocol Local Area Network

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Extents  ▼►

Extent 
Description
date of LiDAR flight
Temporal extent 
Beginning date 2011-10-27 00:00:00
Ending date 2011-11-01 00:00:00

Extent 
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

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

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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 541-750-7760

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

Hours of service m-f 0800-1630
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Resource Maintenance  ▼►

Resource maintenance 
Update frequency  not planned


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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.
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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


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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


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ArcGIS Raster Properties 
▼►
General Information 
* Pixel depth 32
* Compression type None
* 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


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Spatial Data Content  ▼►

Image Description 
* Type of information  physical measurement
Attribute described by cell values ArcGIS GRID


Band information 
* Description Band_1
* Maximum value 133.280029
* Minimum value 0.000000
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


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Data Quality  ▼►

Scope of quality information  ▼►
Resource level  dataset


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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.


Standard procedure identifier 
Value overlap and gaps


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.


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Data quality report - Completeness omission  ▼►
Measure description LiDAR data has been collected and processed to the extent of the boundary shapefile.


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Data quality report - Absolute external positional accuracy  ▼►
Dimension vertical


Measure description Root Mean Square Error


Quantitative test results 
Value RMSE = 0.052 meters
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.


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Lineage  ▼►

Process step 
▼►
When the process occurred 2011-11-01 00:00:00
Description Acquisition. The LiDAR data was collected 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.
Individual's name Watershed Sciences, Inc.
Contact's role  processor


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

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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. 10. The Highest Hit Algorithm was used to create a vegetation DEM.


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


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

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Process step 
▼►
When the process occurred 2012-01-14 00:00:00
Description The bare-earth DEM was subtracted from the Highest hits DEM to produce a vegetation height raster. ArcGIS was used to do the process


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


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

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Geoprocessing history  ▼►

Process 
Process name 
Date 2012-02-02 17:46:16
Tool location c:\program files (x86)\arcgis\desktop10.0\ArcToolbox\Toolboxes\Spatial Analyst Tools.tbx\RasterCalculator
Command issued
RasterCalculator ""hh_bluerivws" - "be_bluerivws"" \\abies\forshare\Groups\HJA_Lidar\blue_river\Rasters\veg_height\vh_bluerivws
Include in lineage when exporting metadata No


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Distribution  ▼►

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 541-750-7760

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

Hours of service m-f 0800-1630
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Distribution format 
Version arcgis 10.1
* Name Raster Dataset


Transfer options 
Units of distribution zip file


Online source 
Location http://andrewsforest.oregonstate.edu/data/studies/spatialdata/gi01103.zip
Access protocol zip file

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Fields  ▼►

Details for object raster  ▼►
Type raster data set
Definition
raster data set
Definition source
source


Field value
  ▼►
Data type floating point
Width 20
Precision 10
Field description
vegetation height calculated from subtracting bare-earth DEM from High Hits DEM, in meters
Description source
source
Description of values continuous domain values calculated by comptuer program


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References  ▼►

Aggregate Information 
Association type  cross reference


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


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


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

Hide Contact information ▲


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

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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
Metadata style FGDC CSDGM Metadata
Standard or profile used to edit metadata FGDC


Created in ArcGIS for the item 2012-02-02 17:46:16
Last modified in ArcGIS for the item 2014-10-20 14:58:28


Automatic updates
Have been performed Yes
Last update 2014-10-20 14:58:28


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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 address tvalentine@fs.fed.us or theresa.valentine@orst.edu

Hours of service m-f 0800-1630
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Metadata Maintenance  ▼►

Maintenance 
Update frequency  not planned


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Thumbnail and Enclosures  ▼►

Thumbnail 
Thumbnail type  JPG

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FGDC Metadata (read-only) ▼►

Entities and Attributes  ▼►

Detailed Description
Entity Type
Entity Type Label raster
Entity Type Definition
raster data set
Entity Type Definition Source source

Attribute
Attribute Label value
Attribute Definition
vegetation height calculated from subtracting bare-earth DEM from High Hits DEM, in meters
Attribute Definition Source source
Attribute Domain Values
Unrepresentable Domain
continuous domain values calculated by comptuer program

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