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Remote Sens. 2017, 9(12), 1339; https://doi.org/10.3390/rs9121339

High-Resolution Mapping of Freeze/Thaw Status in China via Fusion of MODIS and AMSR2 Data

1
Environmental Science Graduate Program, The Ohio State University, Columbus, OH 43210, USA
2
State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, No. 20 Datun Road, Beijing 100101, China
3
National Satellite Meteorological Center, Beijing 100081, China
4
School of Environment and Natural Resources, OARDC, The Ohio State University, Columbus, OH 43210, USA
*
Authors to whom correspondence should be addressed.
Received: 30 October 2017 / Revised: 30 November 2017 / Accepted: 13 December 2017 / Published: 20 December 2017
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Abstract

Transition of freeze/thaw (F/T) affects land-atmospheric interactions and other biospheric dynamics. Global F/T statuses are normally monitored using microwave remote sensing, but at coarse resolutions (e.g., 25 km). Integration of coarse microwave remote sensing data with finer satellite products represents an opportunity to further enhance our ability to map F/T statuses regionally and globally. Here, we implemented and tested an approach to generate daily F/T status maps at a 5-km spatial resolution through the fusion of passive microwave data from AMSR2 and land surface temperature products from MODIS, using China as our study area for the year 2013 and 2014. Moreover, possible influences from elevation, vegetation, seasonality, etc., were also analyzed, as such analysis provides a direction to improve the approach. Overall, our freeze/thaw maps agreed well with ground reference observations, with an accuracy of ~86.6%. The new F/T maps helped to identify regions subject to frequent F/T transitions through the year, such as the Qinghai-Tibetan Plateau, Xinjiang, Gansu, Heilongjiang, Jilin, and Liaoning Province. This study indicates that the combination of AMSR2 and MODIS observations provides an effective method to obtain finer F/T maps (5-km or lower) for extensive regions. The finer F/T maps improve our knowledge of the F/T state detected by satellite remote sensing, and have a wide range of applications in regional studies considering land surface heterogeneity and models (e.g., community land models). View Full-Text
Keywords: high-resolution freeze/thaw; AMSR2; MODIS high-resolution freeze/thaw; AMSR2; MODIS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Hu, T.; Zhao, T.; Shi, J.; Wu, S.; Liu, D.; Qin, H.; Zhao, K. High-Resolution Mapping of Freeze/Thaw Status in China via Fusion of MODIS and AMSR2 Data. Remote Sens. 2017, 9, 1339.

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