canopy height model: The CHM displays vegetation heights as the difference between DSM and DTM heights. The CHM is a single-band, 32-bit float GeoTIFF file with a ground sample distance of 0.5 meters. No Data value is set to -3.40282306074e+038. Note: there are some negative values in the CHM, present in low confidence areas of the DSM and DTM. classified point cloud data: Classified point cloud data is provided in this collection in compressed .laz format. An average point spacing of 0.15 meters was calculated from all returns and all non-noise classes. digital surface model: The DSM represents human-observable surface elevations, which include vegetation, buildings, etc. The DSM is a single band, 32-bit GeoTIFF file with a ground sample distance of 0.5 meters. No Data value is set to -3.40282306074e+038. digital terrain model: The DTM represents elevations of the ground surface by penetrating or flattening any vegetation, bridges, buildings, etc. The DTM is a single-band, 32-bit float GeoTIFF file with a ground sample distance of 0.5 meters. No Data value is set to -3.40282306074e+038.
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Funding was provided by the State of Alaska and by National Park Service award #P17AC00903 and award #P15AC01879.
These data were produced to assess bare earth slope conditions as part of an overarching, multi-hazard risk analysis for the study area, coordinated through the Federal Emergency Management Agency (FEMA) Cooperating Technical Partners (CTP) program. The project was initiated in response to a tragic debris flow incident that took three Alaskans' lives in 2015. This data release is one of a series of DGGS publications to present elevation data.
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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.
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.
| Data format: | canopy height model, classified point cloud data, digital surface model, and digital terrain model in format report point-cloud GeoTIFF |
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| Network links: |
https://doi.org/10.14509/30531 |