{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T16:13:51Z","timestamp":1740154431193,"version":"3.37.3"},"reference-count":46,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2019,12,16]],"date-time":"2019-12-16T00:00:00Z","timestamp":1576454400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["41871225"],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"At present, passive microwave remote sensing is the most efficient method to estimate snow depth (SD) at global and regional scales. Farmland covers 46% of Northeast China and accurate SD retrieval throughout the whole snow season has great significance for the agriculture management field. Based on the results of the statistical analysis of snow properties in Northeast China from December 2017 to January 2018, conducted by the China snow investigation project, snow characteristics such as snow grain size (SGS), snow density, snow thickness, and temperature of the layered snowpack were measured and analyzed in detail. These characteristics were input to the microwave emission model of layered snowpacks (MEMLS) to simulate the brightness temperature (TB) time series of snow-covered farmland in the periods of snow accumulation, stabilization, and ablation. Considering the larger SGS of the thick depth hoar layer that resulted in a rapid decrease of simulated TBs, effective SGS was proposed to minimize the simulation errors and ensure that the MEMLS can be correctly applied to satellite data simulation. Statistical lookup tables (LUTs) for MWRI and AMSR2 data were generated to represent the relationship between SD and the brightness temperature difference (TBD) at 18 and 36 GHz. The SD retrieval results based on the LUT were compared with the actual SD and the SD retrieved by Chang\u2019s algorithm, Foster\u2019s algorithm, the standard MWRI algorithm, and the standard AMSR2 algorithm. The results demonstrated that the proposed algorithm based on the statistical LUT achieved better accuracy than the other algorithms due to its incorporation of the variation in snow characteristics with the age of snow cover. The average root mean squared error of the SD for the whole snow season was approximately 3.97 and 4.22 cm for MWRI and AMSR2, respectively. The research results are beneficial for monitoring SD in the farmland of Northeast China.<\/jats:p>","DOI":"10.3390\/rs11243037","type":"journal-article","created":{"date-parts":[[2019,12,17]],"date-time":"2019-12-17T07:59:01Z","timestamp":1576569541000},"page":"3037","source":"Crossref","is-referenced-by-count":8,"title":["Snow Depth Retrieval in Farmland Based on a Statistical Lookup Table from Passive Microwave Data in Northeast China"],"prefix":"10.3390","volume":"11","author":[{"given":"Lingjia","family":"Gu","sequence":"first","affiliation":[{"name":"College of Electronic Science and Engineering, Jilin University, Changchun 130012, China"}]},{"given":"Xintong","family":"Fan","sequence":"additional","affiliation":[{"name":"College of Electronic Science and Engineering, Jilin University, Changchun 130012, China"}]},{"given":"Xiaofeng","family":"Li","sequence":"additional","affiliation":[{"name":"Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China"}]},{"given":"Yanlin","family":"Wei","sequence":"additional","affiliation":[{"name":"College of Electronic Science and Engineering, Jilin University, Changchun 130012, China"}]}],"member":"1968","published-online":{"date-parts":[[2019,12,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1689","DOI":"10.1175\/1520-0477(1993)074<1689:GSCMAU>2.0.CO;2","article-title":"Global Snow Cover Monitoring: An Update","volume":"74","author":"Robinson","year":"1993","journal-title":"Bull. 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