Aspect (in radians) grid from bare earth digital elevation model (DEM) from 2011 LiDAR, Blue River Watershed

Raster Dataset

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Tags
topography, HJ Andrews Experimental Forest, Landscape Ecology, Oregon, geology, Blue River Watershed, LiDAR, digital elevation model (DEM), Willamette Basin


Summary

The base or bare-earth DEM values were used to calculate the aspect of the study area. 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 aspect at that location, in radians with low value of 0 and high value of 360 degrees. The purpose of the data is to provide users with a very accurate aspect calculation for each grid cell. The data are suitable for creating visualizations, for models that require aspect as an input, determining suitability for on the ground actiivites, and for descriptions of specific sites that require an aspect value.

Description

Watershed Sciences, Inc. (WS) collected Light Detection and Ranging (LiDAR) data for the Blue River Watershed in 2011.This raster contains an computer generated aspect model of the LiDAR (the bare-earth Digital Elevation Model.

Credits

Use limitations

See access and use constraints information.

Extent

West  -122.334155    East  -122.129467
North  44.340085    South  44.202966

Scale Range
Maximum (zoomed in)  1:5,000
Minimum (zoomed out)  1:50,000

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  HJ Andrews Experimental Forest, Oregon, Blue River Watershed, Willamette Basin

Theme keywords  topography, Landscape Ecology, geology, LiDAR, digital elevation model (DEM), vegetation

Thesaurus  ▼►
Title Andrews Forest LTER Thesaurus


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Citation  ▼►

Title Aspect (in radians) grid from bare earth digital elevation model (DEM) from 2011 LiDAR, Blue River Watershed
Creation date 2011-10-27 00:00:00
Publication date 2012-01-31 00:00:00


Edition 1


Presentation formats  digital map
FGDC geospatial presentation format  raster digital data


Other citation details gi01006


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Citation Contacts  ▼►

Responsible party 
Organization's name Watershed Sciences
Contact's role  originator


Responsible party 
Organization's name Forest Science Data Bank
Contact's role  publisher


Contact information  ▼►
Address 
Delivery point Corvallis, OR

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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


Spatial resolution 
Dataset's scale 
Scale denominator 1

Ground sample distance 
Precision of spatial data 1 m (meter)


* Processing environment Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.1.1.3300


ArcGIS item properties 
* Name br_aspect
* Location file://T:\Groups\HJA_LIDAR\blue_river\Rasters\derived_products\br_aspect
* 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  as needed


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Resource Constraints  ▼►

Constraints 
Limitations of use
See access and use constraints information.
Security constraints 
Classification  unclassified
Classification system USDA Forest Service


Additional restrictions No restrictions


Legal constraints 
Limitations of use
no legal constraints on use of this data. We ask that the following
                    Acknowledgements be made:
                    http://andrewsforest.oregonstate.edu/lter/acknowledgements.cfm
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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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Grid  ▼►
Number of dimensions 2


Axis dimensions properties 
Dimension type  row (y-axis)
Dimension size 9432
Resolution  1 m (meter)

Axis dimensions properties 
Dimension type  column (x-axis)
Dimension size 14112
Resolution  1 m (meter)

Cell geometry  area


Transformation parameters are available No


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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 No


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Spatial Data Content  ▼►

Image Description 
* Type of information  physical measurement
Attribute described by cell values aspect in radians


Band information 
* Description br_aspect
* Maximum value 359.999817
* Minimum value -1.000000
Units 
Symbol m

* Number of bits per value 32


Image quality code 
Value none


Processing level code 
Value none


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  attribute type
Scope description 
Dataset Aspect (in radians) grid from bare earth digital elevation model (DEM) from 2011 LiDAR, Blue River Watershed

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


Test date 2011-11-01 00:00:00


Measure name Manual System Calibration
Measure description The vertical accuracy of the LiDAR data is described as the mean and standard deviation (sigma ~ σ) of divergence of LiDAR point coordinates from RTK ground survey point coordinates. To provide a sense of the model predictive power of the dataset, the root mean square error (RMSE) for vertical accuracy is also provided. These statistics assume the error distributions for x, y, and z are normally distributed, thus we also consider the skew and kurtosis of distributions when evaluating error statistics. Statements of statistical accuracy apply to fixed terrestrial surfaces only and may not be applied to areas of dense vegetation or steep terrain. Additional control points are needed to assess accuracy in different land covers


Standard procedure identifier 
Value none


Quantitative test results 
Value 1
Units 
Symbol m

Evaluation type  direct internal
Evaluation method see above
Evaluation procedure  ▼►
Title LIDAR REMOTE SENSING DATA COLLECTION: BLUE RIVER WATERSHED, OR
Publication date 2012-01-31 00:00:00


Edition 1
Edition date 2012-01-31


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

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Conformance test results 
Test passed Yes
Result explanation Project Average = 0.12 m o Median Relative Accuracy = 0.12 m o 1σ Relative Accuracy = 0.13 m o 2σ Relative Accuracy = 0.19 m


Product specification  ▼►
Title Accuracy
Publication date 2012-01-01 00:00:00


Presentation formats  digital document
FGDC geospatial presentation format  document


Resource location online 
Location http://andrewsforest.oregonstate.edu/lter/data/aerial/Blue_River_LiDAR_Report.pdf
Access protocol pdf file
Name LIDAR REMOTE SENSING DATA COLLECTION: BLUE RIVER WATERSHED, OR
Description  chapeter on accuracy assessment
Function performed  download
Application profile pdf file

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Data quality report - Conceptual consistency  ▼►
Dimension horizontal


Test date 2011-12-01 00:00:00


Measure description LiDAR survey datasets were referenced to the 1 Hz static ground GPS data collected over presurveyed monuments with known coordinates. While surveying, the aircraft collected 2 Hz kinematic GPS data, and the onboard inertial measurement unit (IMU) collected 200 Hz aircraft attitude data. Realm Survey Suite was used to process the kinematic corrections for the aircraft. The static and kinematic GPS data were then post-processed after the survey to obtain an accurate GPS solution and aircraft positions. POSPAC was used to develop a trajectory file that includes corrected aircraft position and attitude information. The trajectory data for the entire flight survey session were incorporated into a final smoothed best estimated trajectory (SBET) file that contains accurate and continuous aircraft positions and attitudes.


Standard procedure identifier 
Value LiDAR Remote Sensign Data Collection: HJ Andrews and Willamette NF November 14,2008


Reference that defines the value  ▼►
Title LIDAR REMOTE SENSING DATA COLLECTION: BLUE RIVER WATERSHED, OR
Creation date 2011-11-01 00:00:00
Publication date 2012-01-31 00:00:00


Presentation formats  digital document
FGDC geospatial presentation format  document


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

Hide Reference that defines the value ▲


Quantitative test results 
Value 1
Units 
Symbol m

Evaluation type  direct internal
Evaluation method Manual System Calibration: Calibration procedures for each mission require solving geometric relationships that relate measured swath-to-swath deviations to misalignments of system attitude parameters. Corrected scale, pitch, roll and heading offsets were calculated and applied to resolve misalignments. The raw divergence between lines was computed after the manual calibration was completed and reported for each study area. 2. Automated Attitude Calibration: All data were tested and calibrated using TerraMatch automated sampling routines. Ground points were classified for each individual flight line and used for line-to-line testing. System misalignment offsets (pitch, roll and heading) and scale were solved for each individual mission and applied to respective mission datasets. The data from each mission were then blended when imported together to form the entire area of interest. 3. Automated Z Calibration: Ground points per line were utilized to calculate the vertical divergence between lines caused by vertical GPS drift. Automated Z calibration was the final step employed for relative accuracy calibration.
Evaluation procedure  ▼►
Title LIDAR REMOTE SENSING DATA COLLECTION: BLUE RIVER WATERSHED, OR
Creation date 2012-01-31 00:00:00
Publication date 2012-01-31 00:00:00


Edition 1
Edition date 2012-01-31


Presentation formats  digital document
FGDC geospatial presentation format  document


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

Hide Evaluation procedure ▲


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Data quality report - Completeness omission  ▼►
Test date 2012-01-31 00:00:00


Measure description see description in on-line documentation


Standard procedure identifier 
Value none


Evaluation type  direct internal
Evaluation method see description in on-line documentation
Evaluation procedure  ▼►
Title LIDAR REMOTE SENSING DATA COLLECTION: BLUE RIVER WATERSHED, OR
Creation date 2011-11-01 00:00:00
Publication date 2012-01-31 00:00:00


Edition 1
Edition date 2012-01-31


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

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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
Contact's role  originator


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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.


Process contact 
Organization's name Watershed Sciences
Contact's role  originator


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Process step 
▼►
When the process occurred 2014-08-12 00:00:00
Description The bare-earth DEM was used to calculate an aspect grid, using commands in ArcGIS desktop version 10.1


Process contact 
Individual's name Theresa Valentine
Organization's name Corvallis Forest Science Laboratory
Contact's position Spatial Information Manager
Contact's role  processor


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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Geoprocessing history  ▼►

Process 
Process name 
Date 2014-08-12 13:21:52
Tool location c:\program files (x86)\arcgis\desktop10.1\ArcToolbox\Toolboxes\Spatial Analyst Tools.tbx\Aspect
Command issued
Aspect P:\HJA_LIDAR\blue_river\Rasters\bare_earth\be_bluerivws P:\HJA_LIDAR\blue_river\Rasters\derived_products\br_aspect
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 Manger
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 OR
Postal code 97332
Country US
e-mail address tvalentine@fs.fed.us or theresa.valentine@orst.edu

Hours of service m-f 8:00am-4:30pm
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Ordering process 
Instructions
Call contact person for instructions and costs.

Ordering process 
Terms and fees none
Turnaround time as time permits
Instructions
Obtain information off of WWW site, call contact person for special
                    requests.

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Distribution format 
Version ArcGIS 10.0
* Name Raster Dataset


Transfer options 
Units of distribution zip file


Online source 
Location  http://andrewsforest.oregonstate.edu/data/studies/spatialdata/gi01106.zip
Access protocol zip file
Function performed  download

Medium of distribution 
Medium name  hard disk


Hide Distribution ▲

Fields  ▼►

Details for object hja_veg  ▼►
Type raster
Definition
each cell represents a calculated aspect value.
Definition source
Watershed Sciences


Field value
  ▼►
Data type floating point
Width 10
Field description
aspect of the cell, value is in radians with a range of values from 0 to 360 degrees.
Description source
Watershed Sciences documentation
Range of values 
Minimum value 0
Maximum value 360
Units of measure radian

Description of values vegetation height calculated from subtracting bare-earth DEM from High Hits DEM, in meters


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References  ▼►

Aggregate Information 
Association type  cross reference


Aggregate resource name  ▼►
Title LIDAR REMOTE SENSING DATA COLLECTION: BLUE RIVER WATERSHED, OR
Creation date 2011-11-01 00:00:00
Publication date 2012-01-31 00:00:00


Edition 1


Presentation formats  hardcopy document
FGDC geospatial presentation format  document


Responsible party 
Organization's name Watershed Sciences
Contact's role  originator


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 2014-12-02


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 2014-08-12 13:21:52
Last modified in ArcGIS for the item 2014-12-02 10:02:22


Automatic updates
Have been performed Yes
Last update 2014-12-01 13:53:27


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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 541-758-7760

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 8:00am-4:00pm
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Metadata Maintenance  ▼►

Maintenance 
Update frequency  as needed


Scope of the updates  feature


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Metadata Constraints  ▼►

Security constraints 
Classification  unclassified


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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 hja_veg
Entity Type Definition
each cell represents a calculated aspect value.
Entity Type Definition Source Watershed Sciences

Attribute
Attribute Label value
Attribute Definition
aspect of the cell, value is in radians with a range of values from 0 to 360 degrees.
Attribute Definition Source Watershed Sciences documentation
Attribute Domain Values
Unrepresentable Domain
vegetation height calculated from subtracting bare-earth DEM from High Hits DEM, in meters
Attribute Domain Values
Range Domain
Range Domain Minimum 0
Range Domain Maximum 360
Attribute Units of Measure radian

Hide Entities and Attributes ▲