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|Resource type:||Composite Resource|
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|Created:||Nov 20, 2020 at 7:21 p.m.|
|Last updated:|| Feb 14, 2022 at 4:06 p.m.
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The contained grids were derived by applying a novel downscaling methodology to the coarse, remotely-sensed ESA Climate Change Initiative Soil Moisture Product version 4.5. We employed an ensemble of kernel K-nearest neighbors models to refine the grid cell resolution from 27 km to 100 m using ancillary terrain data and interpolated meteorological observations. The downscaled grids were validated against independent surface soil moisture (SSM) network observations, which revealed an improved performance over the low resolution grids. Performance was further improved when grid cell values were normalized and then rescaled based on the daily SSM minima and maxima observed by the monitoring network. The downscaled grids are independent of vegetation and land cover data, allowing for investigations into spatial relationships between SSM, vegetation and land cover.
For a code example of the KKNN approach, see: https://github.com/warnerdl/DownscalingDelawareSSM
Resource Level Coverage
"These grids are a modeled product, and may not accurately represent real world " surface soil moisture (SSM) values in specific locations. This is particularly relevant for irrigated or artificially drained landscapes. "Files beginning with ""p_vwc_"" contain the raw predicted output of our kernel K-" "nearest Neighbors ensemble. Files beginning with ""DailyScaled"" contain the SSM" predictions that have been normalized and then rescaled based on daily minima and maxima of in situ SSM network observations. Individual files cover all dates in 2018 starting after January 15th. Dates prior to January 15th had frozen soils that led to issues both in in situ SSM network observations and in the ESA-CCI Soil Moisture Product. Coordinate Reference System: NAD 1983 StatePlane Delaware FIPS 0700 Meters +proj=tmerc +lat_0=38 +lon_0=-75.41666666666667 +k=0.999995 +x_0=200000 +y_0=0 +ellps=GRS80 +units=m +no_defs
|The content of this resource is derived from||European Space Agency Climate Change Initiative - Soil Moisture Product version 4.5 https://www.esa-soilmoisture-cci.org/node/237|
People or Organizations that contributed technically, materially, financially, or provided general support for the creation of the resource's content but are not considered authors.
|John Callahan||University of Delaware;Delaware Geological Survey|
|Mario Guevara||University of Delaware|
|Rodrigo Vargas||University of Delaware|
|Daniel Warner||University of Delaware;Delaware Geological Survey||Delaware, US|
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.http://creativecommons.org/licenses/by/4.0/