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- remote-sensing image
- 2013-08-23T00:00:00Ian MadinDepartment of Geology and Mineral Industries800 NE Oregon ST #28 STE 965PortlandOR97232USian.madin@dogami.state.or.us971-673-1542WSI421 SW 6th Ave., Suite 800PortlandOR97204USWSI<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The dataset encompasses portions of Lincoln and Spokane Counties, Washington. These data are LiDAR orthorectified aerial photographs of the Oregon LiDAR Consortium (OLC) Turnbull study area. The data are delineated into north and south halves of </SPAN><SPAN>1/100th of standard USGS 7.5 minute quadrangles to create manageable file sizes. Each four-band color image tile has a pixel resolution of three inches. These data are projected in NAD 83 UTM 11, and their units are in meters.</SPAN></P></DIV></DIV></DIV>This dataset provides high resolution orthophotographs for the Turnbull study area.DoGAMI, WSI
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- Washington, Pacific Northwest, Spokane County, Lincoln County, Cheney, Wa., Turnbull National Wildlife Refuge, Fairchild Air Force Base, Interstate-90
- LiDAR Rectified Orthophotographshigh resolution color imageryaerial photographs
- LiDAR Rectified Orthophotographshigh resolution color imageryaerial photographs
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- This dataset was contracted by the Oregon Department of Geology and Mineral Industries. Information regarding the use of this dataset should be directed to the owner.
- Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 10.0.3.3600
- Ground Condition: UltraCam Eagle
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- 2013-07-21T00:00:002013-07-23T00:00:002012-11-02T00:00:002012-11-08T00:00:00
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- All orthophotographs for the Turnbull study area have been processed and reviewed for contracted accuracy and completeness. Orthophoto mosaics were reviewed at a scale of 1:2000 and reviewed against the LiDAR intensities to ensure of no seam artifacts or offsets.
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- Orthophoto data acquisition took place from October 10 to October 11 and November 4 to November 8, 2012, and July 21 to July 23, 2013. The survey utilized an UltraCam Eagle digital camera system mounted in a Cessna 208B Caravan. Frames were captured with 70% forward overlap and 50% sidelap to reduce the extent of non-nadir portions of the imagery in an effort to cut down on the presence of building lean. Ground level GPS and aircraft IMU were collected during the flight.2013-07-23T00:00:00Orthophoto Data Processing: 1. Acquired frames were reviewed to ensure complete coverage of the study area and absence of any obscuring features within the frames such as clouds or fog. 2. Image frame radiometry was edited to create the most homogenous tone/coloration possible across the entire study area, and image frames were exported as 8 bit tiffs. 3. Photo exterior orientations (EO) were computed using POS processing software, based on independent data from the LiDAR system, IMU, and aircraft. 4. Computed exterior orientations were applied to the radiometrically corrected tiffs, and aerial triangulation was performed to align photos to each other as well as to ground control RTK points. 5. Adjusted image frames were draped upon a DEM generated from the LiDAR grounds and orthorectified, generating 8 bit GeoTiffs for each acquired frame. 6. Individually orthorectified GeoTiffs were mosaicked together to form a single seamless image and to correct for any remaining radiometric inconsistencies, and then output as GeoTiffs according to the specified tiling scheme in order to yield manageable file sizes. 7. The output mosaic GeoTiff tiles were compared to the LiDAR intensities in order to assess their accuracy.2013-08-23T00:00:00Flight 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.
To assess the horizontal accuracy of the orthophotographs, artificial check points were established. Twenty check points, distributed across the total acquired area, were generated on surface features such as painted road lines and fixed high-contrast objects on the ground surface. They were then compared against check points identified from LiDAR intensity images. The root mean square error (RMSE) for the Turnbull study area final mosaic is 0.166 meters and was calculated in relation to the LiDAR-derived check points.RMSEm0.166
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- 2
- 5000
- 5000
- FalseFalse
- 2012112817445600FGDC CSDGM MetadataTRUE
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- file://\\WSI-91\D$\Tarika_working\04_NATURAL_RESOURCES\OLC_Turnbull\Metadata\Turnbull_orthos_metadata_TH_130822\OLC_Turnbull_GeoTiffsLocal Area Network
- DefineProjection H:\ORTHO_PHOTOS\47117C4101.tif PROJCS['NAD_1983_UTM_Zone_11N_2011',GEOGCS['GCS_NAD_1983_2011',DATUM['D_NAD_1983_2011',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',-117.0],PARAMETER['Scale_Factor',0.9996],PARAMETER['Latitude_Of_Origin',0.0],UNIT['Meter',1.0]]FGDC1.0201308231359560050000005000
- 421 SW 6th Ave., Suite 800PortlandOR97204USwww.wsidata.com503-505-5100503-546-6801Watershed Sciences, Inc. (WSI)20130823Department of Geology and Mineral Industries800 NE Oregon ST #28 STE 965PortlandOR97232US971-673-1555971-673-1562monday - Friday, 8am - 4pmhttp://www.oregongeology.org/Ian Madin