Topographic Wetness Index raster - Land Cover Mapping, North Slope of the Arctic National Wildlife Refuge, Alaska, 2019
"We obtained the 5 m Interferometric Synthetic Aperture Radar Digital Terrain Model (IFSAR DTM) tiles for the study area from https://elevation.alaska.gov/ and mosaicked the products into a single image. We aggregated the DTM to 30 m resolution to represent a more generalized landscape level, and also to allow fairly rapid calculation of more processing-intensive terrain metrics. We then calculated the Sage Topographic Wetness Index at 30 m resolution. This integrates the local slope and the upstream contributing terrain in a continuous metric representing the potential wetness.
The 'SAGA Wetness Index' is, as the name says, similar to the 'Topographic Wetness Index' (TWI), but it is based on a modified catchment area calculation ('Modified Catchment Area'), which does not think of the flow as very thin film. As result it predicts for cells situated in valley floors with a small vertical distance to a channel a more realistic, higher potential soil moisture compared to the standard TWI calculation."
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| bureauCode |
[ "010:18" ] |
| contactPoint |
{ "fn": "Todd Sutherland", "@type": "vcard:Contact", "hasEmail": "mailto:todd_sutherland@fws.gov" } |
| description | "We obtained the 5 m Interferometric Synthetic Aperture Radar Digital Terrain Model (IFSAR DTM) tiles for the study area from https://elevation.alaska.gov/ and mosaicked the products into a single image. We aggregated the DTM to 30 m resolution to represent a more generalized landscape level, and also to allow fairly rapid calculation of more processing-intensive terrain metrics. We then calculated the Sage Topographic Wetness Index at 30 m resolution. This integrates the local slope and the upstream contributing terrain in a continuous metric representing the potential wetness. The 'SAGA Wetness Index' is, as the name says, similar to the 'Topographic Wetness Index' (TWI), but it is based on a modified catchment area calculation ('Modified Catchment Area'), which does not think of the flow as very thin film. As result it predicts for cells situated in valley floors with a small vertical distance to a channel a more realistic, higher potential soil moisture compared to the standard TWI calculation." |
| distribution |
[ { "@type": "dcat:Distribution", "title": "swi_alaska_ifsar_dtm30m_i1k.zip", "format": "zip", "mediaType": "application/zip", "description": "Saga Topographic Wetness Index, 30 m resolution.", "downloadURL": "https://iris.fws.gov/APPS/ServCat/DownloadFile/195488?Reference=130646" } ] |
| identifier | http://datainventory.doi.gov/id/dataset/FWS_ServCat_130646 |
| issued | 2020-06-01T00:00:00Z |
| keyword |
[ "ANWR", "Arctic Coastal Plain", "North Slope", "classification", "ecological land survey", "habitat", "land cover", "mapping", "remote sensing", "soil analysis", "vegetation" ] |
| landingPage | https://iris.fws.gov/APPS/ServCat/Reference/Profile/130646 |
| modified | 2020-06-01T00:00:00Z |
| programCode |
[ "010:028", "010:094" ] |
| publisher |
{ "name": "Fish and Wildlife Service", "@type": "org:Organization" } |
| spatial | -149.387222,66.7421341,-141.000626,70.1697845 |
| temporal | 2018-10-01/2019-07-01 |
| theme |
[ "geospatial" ] |
| title | Topographic Wetness Index raster - Land Cover Mapping, North Slope of the Arctic National Wildlife Refuge, Alaska, 2019 |
