Landscape Freeze/Thaw Mapping from Active and Passive Microwave Earth Observations Over the Tursujuq National Park, Quebec, Canada

IF 1.3 4区环境科学与生态学 Q3 ECOLOGY

Ecoscience Pub Date : 2021-09-15 DOI:10.1080/11956860.2021.1969790

C. Touati, T. Ratsimbazafy, J. Poulin, M. Bernier, Saeid Homayouni, R. Ludwig

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引用次数: 2

Abstract

ABSTRACT We investigated the sensitivity to vegetation cover type of active (PALSAR) and passive (SMAP) freeze/thaw (F/T) classification. We also used F/T classification from high-resolution PALSAR data (30 m) to follow the evolution of frozen and thawed soil states obtained from an adaptive algorithm with low-resolution SMAP data (36 km). We used PALSAR and SMAP scenes acquired from June 2015 to January 2017 over the Tursujuq National Park (Umiujaq, Quebec, Canada). A new F/T algorithm with a specific reference threshold under each vegetation type (shrub, grass, lichen, wetland, and bare land) is proposed to classify PALSAR pixels. The validation of the PALSAR F/T classification with soil temperature at ∼5 cm depth revealed a greater overall accuracy (> 80%), with horizontal transmitted and vertical received (HV) thresholds. The PALSAR F/T classification shows that a SMAP pixel is classified as frozen when more than 50% of its area is frozen at the surface. We confirmed the sensitivity to vegetation cover type of passive and active F/T classification with L-band sensor.

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加拿大魁北克省Tursujuq国家公园主动式和被动式微波地球观测的景观冻融制图

摘要我们研究了主动（PALSAR）和被动（SMAP）冻融（F/T）分类对植被覆盖类型的敏感性。我们还使用来自高分辨率PALSAR数据（30m）的F/T分类来跟踪通过低分辨率SMAP数据（36km）的自适应算法获得的冻融土壤状态的演变。我们使用了2015年6月至2017年1月在图尔苏朱克国家公园（加拿大魁北克省乌米乌贾克）拍摄的PALSAR和SMAP场景。提出了一种新的F/T算法，在每种植被类型（灌木、草地、地衣、湿地和裸地）下都有一个特定的参考阈值来对PALSAR像素进行分类。PALSAR F/T分类在~5 cm深度土壤温度下的验证表明，在水平发射和垂直接收（HV）阈值下，总体精度更高（>80%）。PALSAR F/T分类显示，当SMAP像素50%以上的面积在表面冻结时，SMAP像素被分类为冻结。我们用L波段传感器确认了被动和主动F/T分类对植被覆盖类型的敏感性。

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来源期刊

Ecoscience 环境科学-生态学

CiteScore

2.80

自引率

0.00%

发文量

审稿时长

>36 weeks

期刊介绍： Écoscience, is a multidisciplinary journal that covers all aspects of ecology. The journal welcomes submissions in English or French and publishes original work focusing on patterns and processes at various temporal and spatial scales across different levels of biological organization. Articles include original research, brief communications and reviews.