digital surface model: Digital surface models (DSMs) represent all observable elevations within the project extent, capturing vegetation heights, building roofs, and other opaque objects. The raster DSM products in this collection are delivered in 32-bit float format. >orthoimage: Orthoimages are aerial photographs that have been geometrically corrected (orthorectified) for spatial accuracy, coordinating surface elevation with the sensor's location throughout the survey to create a geospatial product of uniform map scale. Collected imagery is assembled into composite mosaics for delivery.
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of EauClaire Place, December 5, 2018: Raw Data File RDF 2019-10C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
This is a raster data set.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest .00000001
Ordinates (y-coordinates) are specified to the nearest .00000001
Planar coordinates are specified in Meters
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is GRS 80.
The semi-major axis of the ellipsoid used is 6378137.
The flattening of the ellipsoid used is 1/298.257222101000025.
This project was funded by State of Alaska general funds. It coincides with and augments a United States Geological Survey QL2 lidar project flown by Kodiak Mapping and available through the DGGS Elevation Portal, https://elevation.alaska.gov/#61.17636:-149.62555:9 (DGGS Staff, 2013). We thank Seth K. Kiester for assistance with equipment and logistics.
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The data release is one of a series of Alaska Division of Geological & Geophysical Surveys (DGGS) publications that provide digital surface models (DSMs) and orthorectified aerial imagery (orthoimagery) collected over selected locations in the greater Anchorage area following the Mw 7.1 November 30, 2018, Anchorage earthquake. We selected areas of interest (AOIs) based on initial damage reports from the Alaska Department of Transportation & Public Facilities (DOT&PF) and the United States Geological Survey (USGS) in order to document ground conditions immediately following the 2018 Mw 7.1 Anchorage earthquake.
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, November 30, 2018, Mw 7.1 Anchorage earthquake photogrammetry: Raw Data File RDF 2019-10, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Ted Stevens Anchorage International Airport, December 6, 2018: Raw Data File RDF 2019-10A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Campbell Lake Dam, December 5, 2018: Raw Data File RDF 2019-10B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Eklutna Lake, December 5, 2018: Raw Data File RDF 2019-10D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Glenn Highway, December 5, 2018: Raw Data File RDF 2019-10E, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Lake O the Hills neighborhood, December 5, 2018: Raw Data File RDF 2019-10F, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Mackenzie Road, December 5, 2018: Raw Data File RDF 2019-10G, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Minnesota Drive, December 5, 2018: Raw Data File RDF 2019-10H, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Pittman Road, December 5, 2018: Raw Data File RDF 2019-10I, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Potter Creek, December 6, 2018: Raw Data File RDF 2019-10J, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Seward Highway, December 6, 2018: Raw Data File RDF 2019-10K, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Ship Creek Dam, December 5, 2018: Raw Data File RDF 2019-10L, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Vine Road, December 5, 2018: Raw Data File RDF 2019-10M, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
Salisbury, J.B., Herbst, A.M., and Wikstrom Jones, Katreen, 2019, Photogrammetric digital surface models and orthoimagery of Westchester Lagoon, December 5, 2018: Raw Data File RDF 2019-10N, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
We evaluated data quality based on vertical and horizontal accuracy compared to control data. See accompanying data acquisition report for a comprehensive listing of control points, checkpoints, accuracy statistics, and known anomalies.
Due to the size and scale of the study area, conventional ground control methods were unobtainable within the timeframe of the survey. Instead, we extracted photo-identifiable horizontal ground control from Earth Systems Research Institute's (ESRI) orthoimagery map service (World Imagery [Clarity], https://www.arcgis.com/home/item.html?id=ab399b847323487dba26809bf11ea91a). The ESRI image service provided accuracies of 0.45 m-1 m.
We used a 2015 lidar survey for the Municipality of Anchorage, Alaska for vertical control on those same points. The 2015 Anchorage lidar data provide a vertical accuracy of 7.2 cm and are available through the DGGS Elevation Portal, https://elevation.alaska.gov/#61.17636:-149.62555:9
Data voids may be observed in the orthophotos. These gaps are a result from the orthorectification process, where pixels where spatially adjusted and the formerly occupied area was not interpolated. Because vertical elevation control is based on a 2015 lidar survey, these data are not suitable for calculating regional-scale vertical ground surface deformation.
We evaluated data quality based on vertical and horizontal accuracy compared to control data. Root mean square errors (RMSE) are reported in the accompanying acquisition report.
Are there legal restrictions on access or use of the data?
- Access_Constraints:
- This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
- Use_Constraints:
- 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.
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RDF 2019-10C
The State of Alaska makes no expressed 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.
DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or 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. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount.
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Network links: |
<http://doi.org/10.14509/30273> |
(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov