2018 Daily Downscaled ESA-CCI Soil Moisture Grids for Delaware, USA


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Created: Nov 20, 2020 at 7:21 p.m.
Last updated: Nov 20, 2020 at 8:15 p.m.
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Abstract

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

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Resource Level Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
NAD 1983 StatePlane Delaware FIPS 0700 Meters
North Latitude
40.2122°
East Longitude
-74.9412°
South Latitude
38.3328°
West Longitude
-76.0289°

Temporal

Start Date:
End Date:

Content

ReadMe.txt

"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 

References

Sources

Derived From: European Space Agency Climate Change Initiative - Soil Moisture Product version 4.5 https://www.esa-soilmoisture-cci.org/node/237

Credits

Contributors

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.

Name Organization Address Phone Author Identifiers
Mario Guevara University of Delaware
John Callahan University of Delaware;Delaware Geological Survey
Rodrigo Vargas University of Delaware
Daniel Warner University of Delaware;Delaware Geological Survey Delaware, US

How to Cite

Warner, D., M. Guevara, J. Callahan, R. Vargas (2020). 2018 Daily Downscaled ESA-CCI Soil Moisture Grids for Delaware, USA, HydroShare, http://www.hydroshare.org/resource/81867bb55f134d8d89ec2250ae6c1014

This resource is shared under the Creative Commons Attribution CC BY.

 http://creativecommons.org/licenses/by/4.0/
CC-BY

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