q46122d81be

Raster Dataset

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Tags
elevation data, digital terrain model, Pacific Northwest, DEM, bare ground, topography, Washington, Chehalis River Watershed, LiDAR, Puget Sound LiDAR Consortium, Light Detection and Ranging, Chehalis River, DTM, bare earth, high-resolution

Summary
Provide high resolution terrain elevation and land cover elevation data.


Description
This dataset represents portions of the Chehalis River Watershed in Greys Harbor, Thurston, Lewis, & Cowlitz counties, WA. 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 3 feet. The elevation units are in US survey feet. Some elevation values have been interpolated across areas in the ground model where there is no elevation data (e.g. over water, under dense vegetation). WSI collected the LiDAR and created this data set for the Puget Sound LiDAR Consortium, Federal Emergency Management Agency Region X, Washington Department of Natural Resources and Lewis County on 1/28/12-02/07/12, 03/04/12-03/09/12, 04/07/12.

Credits
Diana Martinez, Puget Sound LiDAR Consortium Federal Emergency Management Agency Region X Washington Department of Natural Resources Lewis County WSI

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.

ArcGIS Metadata

Topics and Keywords

Place keywords Pacific Northwest, Washington, Chehalis River

Theme keywords elevation data, digital terrain model, DEM, bare ground, topography, Chehalis River Watershed, LiDAR, Puget Sound LiDAR Consortium, Light Detection and Ranging, DTM, bare earth, high-resolution

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Citation

*Titleq46122d81be


Presentation formats *digital map


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Citation Contacts

Responsible party
Organization's nameWSI
Contact's role originator


Contact information
Phone
Voice(541)752-1204

Address
Typepostal
Delivery point517 SW Second Ave., Suite 400
CityCorvallis
Administrative areaOR
Postal code97333

Online resource
Locationwww.wsidata.com

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Responsible party
Individual's nameDiana Martinez
Organization's namePuget Soung LiDAR Consortium
Contact's role distributor


Contact information
Phone
Voice206-971-3052

Address
Typepostal
Delivery point1011 Western Ave., Suite 500
CitySeattle
Administrative areaWA
Postal code98104
e-mail addressdmartinez@psrc.org

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Responsible party
Individual's nameKelly Stone
Organization's nameFEMA Region X
Contact's role point of contact


Contact information
Address
Type
Delivery point20700 44th Ave. W. Suite 110
CityLynnwood
Administrative areaWA
Postal code98036
e-mail addresskelly.stone@fema.dhs.gov

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Responsible party
Individual's nameTerry Curtis
Organization's nameWashington DNR
Contact's role point of contact


Contact information
Address
Typepostal
Delivery point1111 Washington Street SE, Third floor
CityOlympia
Administrative areaWA
Postal code98504
e-mail addressTERRY.CURTIS@dnr.wa.gov

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Responsible party
Individual's nameMatt Hyatt
Organization's nameLewis County
Contact's role point of contact


Contact information
Address
Typepostal
Delivery point2025 NE Kresky Avenue
CityChehalis
Administrative areaWA
Postal code98532
e-mail addressMatt.Hyatt@lewiscountywa.gov

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Resource Details

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


Spatial representation type *grid


Supplemental information 
This data is assembled by 1/4th USGS Quads and projected into Washington State Plane South, FIPS 4602, US Survey Feet.
*Processing environmentMicrosoft Windows 7 Version 6.1 (Build 7600) ; ESRI ArcGIS 10.0.3.3600


CreditsDiana Martinez, Puget Sound LiDAR Consortium Federal Emergency Management Agency Region X Washington Department of Natural Resources Lewis County WSI


ArcGIS item properties
*Nameq46122d81be
*Locationfile://Q:\pslcdata\pslc2012\chehalis\dem\Bare_earth\q46122d81be
*Access protocolLocal Area Network
*Content type Downloadable Data

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Extents

Extent
Geographic extent
Bounding rectangle
Extent type Extent used for searching
*West longitude-123.002873
*East longitude-122.986889
*North latitude46.500225
*South latitude46.437266
*Extent contains the resourceYes

Extent in the item's coordinate system
*West longitude1010238.000000
*East longitude1013544.000000
*South latitude412551.000000
*North latitude435417.000000
*Extent contains the resourceYes

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Resource Points of Contact

Point of contact
Organization's nameWSI
Contact's role originator


Contact information
Phone
Voice541-752-1204

Address
Typeboth
Delivery point517 SW 2nd Ave., Suite 400
CityCorvallis
Administrative areaOR
Postal code97333

Online resource
Locationwww.wsidata.com

HideContact information


Point of contact
Individual's nameDiana Martinez
Organization's namePuget Sound LiDAR Consortium
Contact's role distributor


Contact information
Address
Typepostal
Delivery point1011 Western Ave., Suite 500
CitySeattle
Administrative areaWashington
Postal code98104
e-mail addressdmartinez@psrc.org

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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
*TypeProjected
*Geographic coordinate referenceGCS_North_American_1983_HARN
*ProjectionNAD_1983_HARN_StatePlane_Washington_South_FIPS_4602_Feet
*Coordinate reference details
Projected coordinate system
Well-known identifier2927
X origin-117498300
Y origin-98850300
XY scale37801315.839189909
Z origin-100000
Z scale10000
M origin-100000
M scale10000
XY tolerance0.0032808333333333335
Z tolerance0.001
M tolerance0.001
High precisiontrue
Well-known textPROJCS["NAD_1983_HARN_StatePlane_Washington_South_FIPS_4602_Feet",GEOGCS["GCS_North_American_1983_HARN",DATUM["D_North_American_1983_HARN",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",1640416.666666667],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-120.5],PARAMETER["Standard_Parallel_1",45.83333333333334],PARAMETER["Standard_Parallel_2",47.33333333333334],PARAMETER["Latitude_Of_Origin",45.33333333333334],UNIT["Foot_US",0.3048006096012192],AUTHORITY["EPSG",2927]]

Reference system identifier
*Value2927
*CodespaceEPSG
*Version7.4.1


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Spatial Data Properties

Georectified Grid
*Number of dimensions2


Axis dimensions properties
Dimension type column (x-axis)
*Dimension size1102
*Resolution 3.000000Foot_US

Axis dimensions properties
Dimension type row (y-axis)
*Dimension size7622
*Resolution 3.000000Foot_US

*Cell geometry area
*Point in pixel center


*Transformation parameters are availableYes


*Check points are availableNo


Corner points
*Point1010238.000000 412551.000000
*Point1010238.000000 435417.000000
*Point1013544.000000 435417.000000
*Point1013544.000000 412551.000000

*Center point1011891.000000 423984.000000


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ArcGIS Raster Properties
General Information
*Pixel depth32
*Compression typeNone
*Number of bands1
*Raster formatGRID
*Source typecontinuous
*Pixel typefloating point
*No data value-3.4028235e+038
*Has colormapNo
*Has pyramidsYes


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Spatial Data Content

Image Description
*Type of information physical measurement


Band information
*DescriptionBand_1
*Maximum value962.190002
*Minimum value227.169998
Units
*SymbolFoot_US

*Number of bits per value32


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Data Quality

Data quality report - Conceptual consistency
Measure descriptionLiDAR flight lines have been examined to ensure that there was at least 60% 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.


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Data quality report - Completeness omission
Measure descriptionLiDAR data has been collected and processed for all areas within the project study area.


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Data quality report - Absolute external positional accuracy
Dimensionhorizontal


Evaluation methodSee LiDAR data report.


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Data quality report - Absolute external positional accuracy
Dimensionvertical


Quantitative test results
ValueRMSE = 0.028 meters (0.092 feet)


Evaluation methodThe Root Mean Square Error (RMSE) of the data set is 0.028 meters (0.092 feet). Accuracy was assessed using 4331 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
DescriptionAcquisition. The LiDAR data was collected January 28th-February 7th, March 4th-March 9th, march 21st-March 23rd, and April 7th, 2012. The survey used both a Leica ALS 60 and Optech Orion laser systems 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.


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Process step
DescriptionProcessing. 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.


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Distribution

Distributor
Contact information
Individual's nameDiana Martinez
Organization's namePuget Sound LiDAR Consortium
Contact's role distributor


Contact information
Phone
Voice206-971-3052

Address
Typepostal
Delivery point1011 Western Avenue, Suite 500
CitySeattle
Administrative areaWA
Postal code98104
e-mail addressdmartinez@psrc.org

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Transfer options
Online source
*Locationfile://\\lidar-nas\lidar\pslcdata\pslc2012\chehalis\dem\Bare_earth\topro\q46122d81be
*Access protocolLocal Area Network

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Distribution format
*Format nameRaster Dataset


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Metadata Details

*Metadata languageEnglish(UNITED STATES)
*Metadata character set utf8 - 8 bit UCS Transfer Format


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


*Last update2012-09-28


ArcGIS metadata properties
Metadata formatESRI-ISO
Metadata styleFGDC CSDGM Metadata
Standard or profile used to edit metadataFGDC


Created in ArcGIS2012-09-17T11:15:29
Last modified in ArcGIS2012-09-28T14:00:11


Automatic updates
Have been performedYes
Last update2012-09-28T14:00:11

Item location history
Item copied or moved2012-09-17T11:15:29
FromQ:\pslcdata\pslc2012\chehalis\dem\Bare_earth\topro\q46122d81be
To\\lidar-nas\LiDAR\pslcdata\pslc2012\chehalis\dem\Bare_earth\q46122d81be


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Metadata Contacts

Metadata contact
Organization's nameWSI
Contact's role originator


Contact information
Phone
Voice541-752-1204

Address
Typeboth
Delivery point517 SW 2nd Ave., Suite 400
CityCorvallis
Administrative areaOR
Postal code97333

Online resource
Locationwww.wsidata.com

HideContact information


Metadata contact
Individual's nameDiana Martinez
Organization's namePuget Sound LiDAR Consortium
Contact's role distributor


Contact information
Phone
Voice206-971-3052

Address
Typepostal
Delivery point1011 Western Ave., Suite 500
CitySeattle
Administrative areaWashington
Postal code98104
e-mail addressdmartinez@psrc.org

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FGDC Metadata (read-only)

Identification

Data Quality

Lineage
Process Step
Process Description 
                                Dataset copied.
Source Used Citation Abbreviation
Q:\pslcdata\pslc2012\chehalis\dem\Bare_earth\q46122d81be
Process Date2012-09-04
Process Time14165200


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