100-Meter Resolution Land/Water Mask of Alaska, 2013
Abstract/Contents
- Abstract
- This raster layer is a100-meter resolution land and water mask in (GeoTIFF format) of the conterminous Alaska, with separate values for oceans and for land areas of the United States, Canada, Mexico, the Bahamas, and Cuba. This layer is part of the 1997-2014 edition of the National Atlas of the United States.
- Purpose
- This 100-meter resolution mask image is not intended to be shown as a map layer. Instead, it is a cartographic tool that may be used to identify, select, and adjust areas on other 100-meter resolution image data sets distributed by the National Atlas of the United States.
Description
| Type of resource | cartographic, software, multimedia |
|---|---|
| Form | Raster Dataset |
| Publisher | National Atlas of the United States |
| Publication date | 2013 |
| Language | English |
| Digital origin | born digital |
| Map data | Scale not given. ; Custom projection W 180°--E 180°/N 71°57ʹ17ʺ--N 43°3ʹ12ʺW 180°--E 179°59ʹ58ʺ/N 71°57ʹ16ʺ--N 43°3ʹ12ʺ, Scale not given ; EPSG::4326 |
Creators/Contributors
| Creator | Geological Survey (U.S.) |
|---|
Subjects
| Subject | Landforms |
|---|---|
| Subject | Bodies of water |
| Subject | Alaska |
| Subject | 2013 |
| Subject | Imagery and Base Maps |
| Subject | Oceans |
| Genre | Geospatial data |
| Genre | Cartographic dataset |
Bibliographic information
| Supplemental information | The following pixel values are used in this map layer: >100 Ocean >200 Land ? United States >210 Land ? Canada >240 Land ? Russia Included with the GeoTIFF are an auxiliary information file (.aux.xml), an image overview file (.ovr), a value attribute database file (.vat.dbf), a .tfw file (more information included below), and a .prj file (more information included below.) The contents of the associated world file (.tfw) are: >100.0 >0.0 >0.0 >-100.0 >-3326950.0 >2437950.0 The projection (.prj) file contains the following information: > PROJCS["Albers_NAD83_Alaska", >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["Albers"], >PARAMETER["False_Easting",0.0], >PARAMETER["False_Northing",0.0], >PARAMETER["Central_Meridian",-154.0], >PARAMETER["Standard_Parallel_1",55.0], >PARAMETER["Standard_Parallel_2",65.0], >PARAMETER["Latitude_Of_Origin",50.0], >UNIT["Meter",1.0]] Data set extent in meters (Albers Equal-Area Conic projection) >North 2438000 >West -3327000 >East 1654000 >South 346000 There are no NULL or NODATA values in the GeoTIFF. Information about National Atlas Web services can be found on the Web Map and Web Feature Services page; see <http://nationalatlas.gov/infodocs/webservices.html.> |
|---|---|
| Use limitation | None. Acknowledgment of The National Atlas of the United States of America would be appreciated in products derived from these data. |
| WGS84 Cartographics | This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection. |
| Location | https://purl.stanford.edu/yw302ty6400 |
Access conditions
- Use and reproduction
- This item is in the public domain. There are no restrictions on use.
- Copyright
- This work is in the Public Domain, meaning that it is not subject to copyright.
Preferred citation
- Preferred citation
- U.S. Geological Survey. (2013). 100-Meter Resolution Land/Water Mask of Alaska, 2013. National Atlas of the United States. Available at: http://purl.stanford.edu/yw302ty6400.
Collection
National atlas of the United States of America, 1997-2014
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