Staff, DGGS, 2013, Elevation Datasets of Alaska: Digital Data Series DDS 4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
This is a raster data set.
The map projection used is GS_1984_Web_Mercator_Auxiliary_Sphere.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.00000001
Ordinates (y-coordinates) are specified to the nearest 0.00000001
Planar coordinates are specified in meters
The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_1984.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257223563.
This work was supported by the State of Alaska's General Fund.
(907)451-5020 (voice)
dggsgis@alaska.gov
In support of geologic mapping and hazards evaluation the Alaska Division of Geological & Geophysical Surveys (DGGS) is acquiring and compiling public-domain elevation datasets throughout Alaska. We have compiled an interactive map to provide the public with an accurate, user-friendly, reference-based inventory of this data. This resource is intended to facilitate planning and research by providing simple and quick means of visualizing structure locations and characteristics. Users must recognize original collection resolution limitations when zooming in farther than the mapped resolution for a given dataset and treat resulting visual representations with appropriate caveats.
Alaska Division of Geological & Geophysical Surveys, 2013, Alaska Division of Geological & Geophysical Surveys Publications Catalog.Online Links:
Data sources used in this process:
Alaska Division of Geological & Geophysical Surveys, 2013, Alaska Division of Geological & Geophysical Surveys Publications Catalog - keyword: Lidar.Online Links:
For the purpose of creating an FGDC (CSDGM) compliant metadata file, we consider the attributes of this application to be the underlying base layer maps and data layers. The relative accuracy of the base layers is entirely determined by the data provider and varies by location and scale. The base layer options may change over time as new or better sources become available. The relative accuracy of the elevation data varies by source and is dependent on how it was collected and processed. The intended purpose of this application is to provide a preview of the available datasets. For rigorous scientific use users should obtain the originating data from the cited source.
The data shown in the interactive web map has been reprojected from its native projection into WGS 1984 Web Mercator Auxiliary Sphere (WKID: 3857; Authority: EPSG) for display in a web browser. For information regarding the native projection of the source data, please refer to the metadata supplied with any data downloaded from the interface. Disclaimer: While digital data can be displayed precisely at any scale, data accuracy remains constant. Although the user may increase the displayed scale, uncertainties and errors in raster location remain tied to original collection resolution. Users must recognize these limitations when zooming in farther than the mapped resolution for a given dataset and treat resulting visual representations with appropriate caveats.
The attributes displayed by this application were compiled from various public-domain base layers and elevation datasets. This tool is not an exhaustive library of all the elevation data that has been collected throughout Alaska. The elevation datasets served by this application were either published by DGGS or other governmental agency or submitted to DGGS with explicit distribution permission.
We have used informal "hallway testing" to ensure that the interface functions according to project specifications. The interface and underlying programming may change in response to user feedback.
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.
(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov
DDS 4
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: | Interactive map and web map service |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/25239> <http://maps.dggs.alaska.gov/elevationdata/> |
(907)451-5020 (voice)