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."
Complete Metadata
| 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": "U.S. 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 |
