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Estimating snow cover from high-resolution satellite imagery by thresholding blue wavelengths

Journal Article · · Remote Sensing of Environment

We report the extent and duration of snow cover, a critical component of the hydrologic cycle and the global climate system, is expected to shift dramatically under climate change. Therefore, developing high-resolution assessments of snow cover change is crucial for estimating the impact of changing snow cover on watershed and ecosystems processes in cold regions. Remote sensing tools provide a powerful method for mapping snow-covered area (SCA) across a landscape. The most common method for estimating SCA utilizes the normalized difference snow index (NDSI), which relies on spectral measurements in the shortwave-infrared wavelengths (SWIR). NDSI can effectively estimate catchment- to regional-scale SCA, but it cannot be used to assess fine-scale SCA because of current limitations on the spatial resolution of satellite-derived SWIR measurements. Here, we map SCA using a threshold of blue wavelengths and high-resolution satellite imagery. The thresholding method, which we call the Blue Snow Threshold algorithm (BST), has previously been used with digital camera imagery. We refine and automate the algorithm for use with cloud-free high-resolution satellite imagery and find that the BST can be used to assess fine-scale SCA. For validation, we compared BST-derived estimates of SCA to a) airborne lidar surveys, b) Landsat fractional SCA, and c) snow disappearance dates from Snow Telemetry (SNOTEL) stations. When compared to airborne lidar surveys of SCA, the BST predicted SCA had a range of F-scores between 0.81 and 0.94 in four study areas in California and Colorado. We also found general agreement between SCA and snow disappearance at multiple SNOTEL sites across the western United States. Given the relatively recent availability of high-resolution satellite imagery with spectral measurements in the visible wavelengths but lacking in SWIR, the BST offers a reliable and easy-to-apply tool for examining fine-scale snow-related processes.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Office of Biological & Environmental Research (BER); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1957919
Alternate ID(s):
OSTI ID: 1905169
Report Number(s):
LA-UR-22-24095
Journal Information:
Remote Sensing of Environment, Journal Name: Remote Sensing of Environment Vol. 285; ISSN 0034-4257
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (64)

Effects of Climate on the Active Layer and Permafrost on the North Slope of Alaska, U.S.A. journal January 1997
High-Resolution Satellite Data Open for Government Research journal March 2013
White water: Fifty years of snow research in WRR and the outlook for the future journal July 2015
Snow disappearance timing is dominated by forest effects on snow accumulation in warm winter climates of the Pacific Northwest, United States journal April 2017
Implications of global climate change for snowmelt hydrology in the twenty-first century journal March 2009
Lower forest density enhances snow retention in regions with warmer winters: A global framework developed from plot-scale observations and modeling: Forests and Snow Retention journal October 2013
Effect of snow cover on pan-Arctic permafrost thermal regimes journal October 2014
Multiple Effects of Changes in Arctic Snow Cover journal December 2011
Spectral signature of alpine snow cover from the landsat thematic mapper journal April 1989
Assessment of methods for mapping snow cover from MODIS journal January 2013
Automated mapping of persistent ice and snow cover across the western U.S. with Landsat journal July 2016
Remote sensing, hydrological modeling and in situ observations in snow cover research: A review journal June 2018
Estimating fractional snow cover from MODIS using the normalized difference snow index journal February 2004
Retrieval of subpixel snow covered area, grain size, and albedo from MODIS journal April 2009
Ground-based testing of MODIS fractional snow cover in subalpine meadows and forests of the Sierra Nevada journal January 2013
The Airborne Snow Observatory: Fusion of scanning lidar, imaging spectrometer, and physically-based modeling for mapping snow water equivalent and snow albedo journal October 2016
Watershed-scale mapping of fractional snow cover under conifer forest canopy using lidar journal March 2019
The ECOSTRESS spectral library version 1.0 journal September 2019
Evaluating satellite retrieved fractional snow-covered area at a high-Arctic site using terrestrial photography journal March 2020
High-resolution CubeSat imagery and machine learning for detailed snow-covered area journal June 2021
Characteristics of the western United States snowpack from snowpack telemetry (SNOTEL) data journal July 1999
Influence of the seasonal snow cover on the ground thermal regime: An overview journal January 2005
Recent Northern Hemisphere snow cover extent trends and implications for the snow-albedo feedback journal January 2007
Using repeated patterns in snow distribution modeling: An Arctic example: REPEATED SNOW PATTERNS journal December 2010
Geophysical Monitoring Shows that Spatial Heterogeneity in Thermohydrological Dynamics Reshapes a Transitional Permafrost System journal March 2021
Snowdrift Landscape Patterns: An Arctic Investigation journal November 2020
Ranking Forest Effects on Snow Storage: A Decision Tool for Forest Management journal October 2021
Permafrost is warming at a global scale journal January 2019
Snow cover is a neglected driver of Arctic biodiversity loss journal October 2018
The changing thermal state of permafrost journal January 2022
Decreasing snow cover alters functional composition and diversity of Arctic tundra journal August 2020
Remote sensing of snow – a review of available methods journal December 2011
Satellite discrimination of snow/cloud surfaces journal January 1984
Arctic tundra shrubification: a review of mechanisms and impacts on ecosystem carbon balance journal April 2021
Performance Assessment of Optical Satellite-Based Operational Snow Cover Monitoring Algorithms in Forested Landscapes journal January 2021
Snow Reflectance from LANDSAT-4 Thematic Mapper journal May 1984
Estimating Snow Cover From Publicly Available Images journal June 2016
Winter snow and spring temperature have differential effects on vegetation phenology and productivity across Arctic plant communities journal January 2021
Pervasive shifts in forest dynamics in a changing world journal May 2020
Tundra shrub expansion may amplify permafrost thaw by advancing snowmelt timing journal December 2019
Changes of Snow Cover, Temperature, and Radiative Heat Balance over the Northern Hemisphere journal November 1994
A Global Climatic Model Based on the Energy Balance of the Earth-Atmosphere System journal June 1969
Global Snow Cover Monitoring: An Update journal September 1993
Declining Mountain Snowpack in Western North America* journal January 2005
The Changing Cryosphere: Pan-Arctic Snow Trends (1979–2009) journal November 2011
Changes toward Earlier Streamflow Timing across Western North America journal April 2005
A Comparison of Snow Telemetry and Snow Course Measurements in the Colorado River Basin journal August 2006
Snow albedo feedback: Current knowledge, importance, outstanding issues and future directions journal January 2016
The parameterization of surface albedo for sea ice and its snow cover journal March 1996
An ecosystem-wide reproductive failure with more snow in the Arctic journal October 2019
Satellite Potentials in Snowcover Monitoring and Runoff Prediction journal August 1976
Recent advances in remote sensing of seasonal snow journal January 2010
Mapping alpine snow using a spectral mixture modeling technique journal January 1993
Automated Classification of Terrestrial Images: The Contribution to the Remote Sensing of Snow Cover journal February 2019
Remote Sensing of Snow Cover Using Spaceborne SAR: A Review journal June 2019
Estimating Fractional Snow Cover in Open Terrain from Sentinel-2 Using the Normalized Difference Snow Index journal September 2020
SnowCloudMetrics: Snow Information for Everyone journal October 2020
A Technical Review of Planet Smallsat Data: Practical Considerations for Processing and Using PlanetScope Imagery journal September 2021
Improving Mountain Snow and Land Cover Mapping Using Very-High-Resolution (VHR) Optical Satellite Images and Random Forest Machine Learning Models journal August 2022
Advancements for Snowmelt Monitoring by Means of Sentinel-1 SAR journal April 2016
The effect of solar radiation variations on the climate of the Earth journal January 1969
Developing a representative snow-monitoring network in a forested mountain watershed journal February 2017
Using MODIS estimates of fractional snow cover area to improve streamflow forecasts in interior Alaska journal January 2019
A statistical approach to represent small-scale variability of permafrost temperatures due to snow cover journal January 2014