20170713
09223800
1.0
FGDC CSDGM Metadata
FALSE
HillShade K:\gis\rasters\DEM_DGGS_2011_Pipeline_Mosaic.tif C:\Data\DGGS_LiDAR\Hillshade_DGGS_LiDAR_Mosaic.tif 315 45 NO_SHADOWS 1
BuildPyramids C:\Data\DGGS_LiDAR\Hillshade_DGGS_LiDAR_Mosaic.tif -1 NONE NEAREST DEFAULT 75 OVERWRITE
Hillshade_DGGS_2011_Pipeline_Mosaic.tif
file://K:\gis\rasters\Hillshade_DGGS_2011_Pipeline_Mosaic.tif
Local Area Network
1300765.031532
1640232.856532
3745368.439394
4117231.212728
1
002
Projected
GCS_North_American_1983
Linear Unit: Foot_US (0.304801)
NAD_1983_StatePlane_Alaska_3_FIPS_5003_Feet
<ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.4'><WKT>PROJCS["NAD_1983_StatePlane_Alaska_3_FIPS_5003_Feet",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",1640416.666666667],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-146.0],PARAMETER["Scale_Factor",0.9999],PARAMETER["Latitude_Of_Origin",54.0],UNIT["Foot_US",0.3048006096012192],AUTHORITY["Esri",102633]]</WKT><XOrigin>-16806300</XOrigin><YOrigin>-52448700</YOrigin><XYScale>137255069.87923574</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.0032808333333333331</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>102633</WKID><LatestWKID>102633</LatestWKID></ProjectedCoordinateSystem>
8
FALSE
LZW
1
TIFF
TRUE
continuous
unsigned integer
255
20180319
13274200
20180319
13274200
Metadata manager
907-451-5020
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Fairbanks
AK
99709-3707
US
20180319
ArcGIS Metadata
1.0
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
907-451-5020
907-451-5050
3354 College Road
Fairbanks
AK
99709-3707
US
dggspubs@alaska.gov
8 am to 4:30 pm, Monday through Friday, except State holidays
Please view our website (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
Free download
GEOTIFF
http://www.dggs.alaska.gov/pubs/id/22727
RDF 2011-3E
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
907-451-5020
907-451-5050
3354 College Road
Fairbanks
AK
99709-3707
US
dggspubs@alaska.gov
8 am to 4:30 pm, Monday through Friday, except State holidays
Please view our website (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
contact DGGS for current pricing
Current publication is not available on paper. To purchase other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard.
RDF 2011-3E
http://www.dggs.alaska.gov/pubs/id/22727
Raster Dataset
Elevation_2011_Hillshade_Pipeline
2011-01-01
Hubbard, T.D.
Gallagher, P.E.
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Fairbanks, Alaska USA
Braun, M.L.
Westbrook, R.E.
raster digital data
Raw Data File
RDF 2011-3E
High-resolution lidar data for Alaska infrastructure corridors
In advance of design, permitting, and construction of a pipeline to deliver North Slope natural gas to out-of-state customers and Alaska communities, the Division of Geological & Geophysical Surveys (DGGS) has acquired lidar (light detection and ranging) data along proposed pipeline routes, nearby areas of infrastructure, and regions where significant geologic hazards have been identified. Lidar data will serve multiple purposes, but have primarily been collected to (1) evaluate active faulting, slope instability, thaw settlement, erosion, and other engineering constraints along proposed pipeline routes, and (2) provide a base layer for the state-federal GIS database that will be used to evaluate permit applications and construction plans. Hillshade (shaded relief) images, produced from bare-earth DEMs provide a visual representation of topographic relief.
Provide high-resolution hillshade image data.
Data collection was supported by funding from the Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS), the Alaska Gas Pipeline Project Office, the Office of the Federal Coordinator, and the Alaska Gasline Development Corporation (AGDC). Lidar data were collected and processed by Watershed Sciences of Corvalis, Oregon. Survey data were collected by McClintock Land Associates of Eagle River, AK. Lidar data and derivative products were checked for quality, completeness, and accuracy by State of Oregon Department of Geology & Mineral Industries based in Portland, OR.
Alaska Division of Geological & Geophysical Surveys
GIS Data Manager/GIS Analyst
907-451-5029
907-451-5020
3354 College Rd
Fairbanks
AK
99709-3707
US
Alaska
State of
Alaska Highway Corridor
Fairbanks Quadrangle
Trans-Alaska Pipeline
Division of Geological & Geophysical Surveys
geoscientificInformation
ISO 19115 Topic Category
Remote Sensing
Lidar
Shaded Relief
Gasline
Topographic Map
Hillshade Image
Alaska Pipeline
Proposed Natural Gas Pipeline
Geomorphology
Alaska Division of Geological & Geophysical Surveys
Remote Sensing
Lidar
Shaded Relief
Gasline
Topographic Map
Hillshade Image
Alaska Pipeline
Proposed Natural Gas Pipeline
geoscientificInformation
Geomorphology
Alaska
State of
Alaska Highway Corridor
Fairbanks Quadrangle
Trans-Alaska Pipeline
The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity, whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requestor or anyone else exceed the fee paid for the electronic service or product.
The dataset(s) is (are) available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
High-resolution lidar data for Alaska infrastructure corridors
2011-01-01
Hubbard,T.D.
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Fairbanks, AK USA
Koehler, R.D.
Combellick, R.A.
Raw Data File
RDF 2011-3
http://www.dggs.alaska.gov/pubs/id/22722
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.4.1.5686
-150
-147
64
65
ground condition
2010-01-01
2011-01-01
The Alaska Division of Geological & Geophysical Surveys(DGGS) created hillshade images from bare-earth digital elevation models that were created by Watershed Sciences. This metadata file was written to document and describe, as a whole, all the lidar hillshade image files generated for this project. Metadata files, created by DGGS, are also included with each data download and may include additional useful information that is specific to each individual file. For each lidar data delivery area, reports documenting data collection methodology, accuracy, and quality control were provided by Watershed Sciences and the Oregon Department of Geology and Mineral Industries (DOGAMI). The reports may provide useful information when using hillshade images. These reports have been combined into single comprehensive reports organized by delivery region. The lidar QC report (the comprehensive report from DOGAMI) and the lidar delivery report (the comprehensive report from Watershed Sciences) can be found at http://www.dggs.alaska.gov/pubs/id/22722. Information about the quadrangles included in individual delivery regions can be found in the lidar delivery index report included with the data download. The DGGS metadata standard extends the FGDC standard to include several elements that are required to facilitate internal data management. This dataset is described as a single layer titled: >hillshade_image lidar hillshade image
1
-148.215749
-146.001155
65.265816
64.233496
If the user has modified this metadata file in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent this metadata file, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.
Lidar data have been examined to ensure that overlapping flight lines have consistent elevation values. Project specifications require that lidar consistency, measured as vertical offsets between adjacent flight lines, must average less than 0.15 meters. Refer to the lidar QC report and the lidar delivery report for statistics from consistency analyses for individual delivery sets. Flight lines have been examined to ensure that there was at least 60% sidelap and that there are no data gaps. Shaded relief, lidar slope, and bare-earth digital elevation model (DEM) images have been visually inspected for data errors such as pits, border artifacts, gaps, and shifting. Additionally, all file naming conventions and formats have been checked for consistency.
Lidar data have been checked for accuracy and completeness. Please refer to the lidar delivery report and lidar QC report for details about data accuracy completeness for individual delivery sets.
Accuracy of each hillshade image is a function of the accuracy of lidar data from which it was derived. Absolute accuracy refers to the mean vertical offset of lidar data relative to measured ground-control points (GCP) obtained throughout the lidar sampling area. Ground control points were collected by McClintock Land Associates, a licensed surveying company, to be used as control comparison with lidar elevations. Refer to the lidar delivery report and lidar QC report for more details on the accuracy of the lidar data for each delivery area, including a comparison of GCP elevations with bare-earth digital elevation model elevations.
True horizontal accuracy is regarded as a product of the lidar ground footprint. Lidar is referenced to co-acquired GPS base station data that have accuracies far greater than the value of the lidar footprint. The ground footprint is equal to 1/3333rd of the above - ground flying height. The ground footprint for data collected for this project exceeds typical accuracy of ground control used to reference the lidar data (less than 0.01 meters). Project specifications require the lidar footprint to be between 0.15 and 0.40 meters. Refer to the lidar QC report and lidar delivery report for additional information on horizontal accuracy for individual delivery areas.
Vertical accuracy was assessed by comparing GPS survey collected by McClintock Land Associates with lidar digital elevation models to expose offsets. Project specifications list the maximum root mean square vertical offset to be 0.20 meters. Please see the lidar QC report and lidar delivery report for statistics from vertical accuracy analysis for individual delivery areas.
A metadata file was created to generally describe data aquisition of lidar and creation of lidar hillshade images for the entire project.
2011-01-01
Processing lidar data: (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 in 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 on 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.
Acquisition: The lidar data were collected between September and October 2010 and between May and July 2011. The survey used the Leica ALS 60 system. 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.
Hillshade images were created from the bare-earth DEMs using functionality in Arc GIS. Azimuth was set to 315 and altitude was set to 45 and the z factor was set to 1.
Hydro-flattening: A combination of automated and manual detection and adjustment techniques was used to identify lake boundaries and water levels for closed water bodies with a surface area > 150 square meters. Boundary polygons were developed using an algorithm that weights lidar-derived slopes, intensities, and return densities to detect the lake edge. Once detected, lake edges were manually reviewed and edited in a 3-D environment, and polygons were created with elevations computed from the filtered lidar returns. During the initial ground-modeling process returns from the water surface within each polygon were filtered and inspected for false low points. The elevation of each lake was computed as 5 cm above the minimum elevation of filtered-water surface cells within the lake polygon. Lake-boundary polygons were then incorporated into the final terrain model and enforced as hard breaklines. The initial ground classified-points falling within lake polygons were reclassified as water points and omitted from the final bare-earth DEM.
Creation of bare-earth DEMs: (1) The TerraScan software suite was used to classify near-ground points. Geometric constraints were used to remove all points not near the earth. The resulting bare-earth ground model was then visually inspected and additional ground modeling was performed in site-specific areas to improve ground detail. (2) The corrected and filtered return points were compared to the real-time kinematic (RTK) ground survey points collected to verify the vertical and horizontal accuracies. (3) Points were output as laser points and, TINed, and GRIDed surfaces to create the bare-earth DEM.
2
1
0
1300765.031532 3745368.439394
1300765.031532 4117231.212728
1640232.856532 4117231.212728
1640232.856532 3745368.439394
1470498.944032 3931299.826061
103470
3.280833
113344
3.280833
Hillshade_DGGS_2011_Pipeline_Mosaic.tif.vat
lidar hillshade image
this report
hillshade_image
Table
255
OID
OID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Value
Value
Integer
9
9
0
Count
Count
Double
19
0
0
There are no attributes other than the elevation values for the individual pixels and the encoded values for easting and northing coordinates. There are no attached attribute tables.
this report
dataset
Esri
8.0.1
Band_1
254.000000
0.000000
8