303724d9-2f5f-4de7-b9bc-84544f5240b0_source eng; USA utf8 dataset Simone Montayne Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays pointOfContact 2022-12-16 ISO 19115 Geographic Information - Metadata ISO 19115:2003/Cor.1:2006(E) Coastal bluff stability assessment for Homer, Alaska 2022-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Buzard, R.M. originator Overbeck, J.R. originator https://doi.org/10.14509/30908 REPORT, DATA Report of Investigation RI 2022-5 22 p., 2 sheets, scale 1:50,000 Coastal bluff stability assessment for Homer, Alaska, Report of Investigation 2022-5, evaluates the stability of coastal bluffs in Homer, Alaska, using aerial imagery and modern elevation data. We produce maps of historical shoreline change and an alongshore bluff instability hazard score. Shoreline change is calculated by comparing the bluff top and toe positions in historical and modern orthorectified aerial imagery. Since 1951, Homer's coastal bluffs have eroded at an average rate of -1.0 ft/yr (-0.29 m/yr). Key indicators of bluff instability are historical shoreline change rates, bluff slope and height, vegetation, existing erosion protection structures, and water drainage. Most of the Homer coastline has a low to medium bluff instability hazard score. These coastal hazard assessment products can guide decisions to reduce risk. These products are released as a DGGS publication component with an open end-user license. All files can be downloaded from the Alaska Division of Geological & Geophysical Surveys website (http://doi.org/10.14509/30908). These coastal hazard assessment products can guide decisions to reduce risk. The Federal Emergency Management Agency (FEMA) provided funding through a Cooperative Agreement to the Alaska Division of Geological & Geophysical Surveys to complete this Coastal Bluff Stability Project under grant number EMS-2019-CA-00022-R05. We thank FEMA Cooperating Technical Partners Program, the City of Homer, and the Homer Planning Commission for supporting this work. Major improvements were made thanks to the thorough and insightful reviews by Bret Hig Higman, Chris Maio, Barrett Salisbury, and FEMA. Much of this study was possible thanks to the foundational work by Steve Baird and the Kachemak Bay National Estuarian Research Reserve. completed Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. pointOfContact unknown Coastal Coastal Erosion Coastal and River DGGS Engineering Engineering Geology Environment Environmental Erosion Geodatabase Geologic Geologic Hazards Geological Process Geology Geomorphology Geotechnical Groundwater Emergence Hazards Hydrology Image Interpretation Interpretation Landslide Methods Slides Slope Slump Surface theme Alaska Division of Geological & Geophysical Surveys Beluga Lake Bidarki Creek Bluff Point Cook Inlet Diamond Creek Fritz Creek Homer Kachemak Bay Lampert Lake Shingle Beach place Alaska Division of Geological & Geophysical Surveys 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. otherRestrictions 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. otherRestrictions 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). Photogrammetry-derived historical orthoimagery for Homer, Alaska from 1951, 1952, 1964, and 1985 2021-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Buzard, R.M. originator https://doi.org/10.14509/30824 Raw Data File RDF 2021-21 10 p crossReference Bluff Point landslide, a massive ancient rock failure near Homer, Alaska 1978-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Reger, R.D. originator https://doi.org/10.14509/409 Geologic Report GR 61B p. 5-9 crossReference Lidar-derived elevation models for Homer, Alaska 2021-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Salisbury, J.B. originator Daanen, R.P. originator Herbst, A.M. originator https://doi.org/10.14509/30591 Raw Data File RDF 2021-2 6 p crossReference Updated tsunami inundation maps for Homer and Seldovia, Alaska 2019-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Suleimani, E.N. originator Nicolsky, D.J. originator Salisbury, J.B. originator https://doi.org/10.14509/30095 Report of Investigation RI 2018-5 v. 2 97 p., 11 sheets crossReference vector eng; USA geoscientificInformation -151.730844 -151.371800 59.631397 59.689761 1951-01-01 2022-01-01 >baseline: Shore-parallel line from which transects are cast >bluff_toe_2019_bare_earth: Bluff toe delineated from 2019 digital elevation model >bluff_toe_all_veg: Bluff toe delineated from imagery >bluff_top_all_veg: Bluff top edge delineated from imagery >bluff_top_2019_bare_earth: Bluff top edge delineated from 2019 digital elevation model >DSAS_ave_rates: Average shoreline change of top and toe veg lines >DSAS_ave_rates_clip_toe: Same as DSAS_ave_rates, but transects clipped to bluff toe >DSAS_toe_rates: Shoreline change statistics for bluffToe_all_veg >DSAS_top_rates: Shoreline change statistics for bluffTop_all_veg >DSAS_transects: transects drawn perpendicular to Baseline to measure shoreline change. >slope_stability_transects: Alongshore transects with shoreline change statistics and instability scores true database unknown Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. distributor Contact DGGS for current pricing Free download https://doi.org/10.14509/30908 database CSDGM IMPORT ERROR: No digtinfo/formcont information dataset Horizontal Positional Accuracy Report The total uncertainty of each year's image orthorectification and shoreline delineation are quantified and discussed in the accompanying report. Users must recognize the scope and purpose of this study, the source data's limitations, and the uncertainties inherent to hazard modeling. We encourage users to reference the accompanying report when using the database output for purposes other than graphical displays. This publication is part of a DGGS Report of Investigations (RI). An RI is the completed product of original research and analysis. RIs use professional cartography and undergo rigorous peer review, editing, and revision. This publication is part of a DGGS Report of Investigations (RI). An RI is the completed product of original research and analysis. RIs use professional cartography and undergo rigorous peer review, editing, and revision. not applicable This lineage was generated by the FGDC CSDGM to 19139 transformation Data compilation and analysis - This analysis focuses on two goals: (1) calculate historical bluff erosion and (2) estimate current bluff stability. Historical bluff erosion is computed using orthorectified aerial imagery and the Digital Shoreline Analysis System (DSAS; Himmelstoss and others, 2018). Bluff stability is estimated by combining variables that factor into instability: height, slope angle, vegetation, drainage, erosion history, and shoreline armoring. A comprehensive description of the procedures and source data is available in the accompanying report. 2022-01-01T00:00:00 Source Contribution: data compilation and analysisSource Type: ArcGIS extension Digital Shoreline Analysis System (DSAS) Version 5.0 User Guide 2018-01-01 publication U.S. Geological Survey United States publisher Himmelstoss, E.A. originator Farris, A.S. originator Henderson, R.E. originator Kratzmann, M.G. originator Ergul, Ayhan originator Zhang, Ouya originator Zichichi, J.L. originator Thieler, E.R. originator https://dggs.alaska.gov/pubs/id/30649 Open-File Report OF 2018-1179 110 p 2018-01-01 otherRestrictions Metadata Use Constraints: If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys. unknown This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2019-08-12T11:11:00 version of the FGDC CSDGM to ISO 19139 transform. Simone Montayne Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays pointOfContact