男友太凶猛1v1高h,大地资源在线资源免费观看 ,人妻少妇精品视频二区,极度sm残忍bdsm变态

Global EditionASIA 中文雙語Fran?ais
China
Home / China / Innovation

China Focus: New method enables high-precision soil moisture estimation

Xinhua | Updated: 2025-07-11 14:06
Share
Share - WeChat
This photo taken on Sept 9, 2024 shows the landscape of earth forest in Zanda county of Ngari prefecture, Southwest China's Xizang autonomous region. [Photo/Xinhua]

LANZHOU -- Chinese researchers have proposed a new method for high-precision soil moisture estimation using the technique of blind source separation (BSS).

This study made breakthroughs in the theoretical mechanisms and methods of soil moisture retrieval on Earth's surface, proposing an innovative solution to this problem, according to Jin Rui, a researcher at the Northwest Institute of Eco-Environment and Resources (NIEER) of the Chinese Academy of Sciences (CAS).

The study was conducted by NIEER researchers in collaboration with researchers from the Institute of Tibetan Plateau Research (ITP) of the CAS, Shanxi Normal University, and Beijing Normal University. The results have been published in the journal IEEE Transactions on Geoscience and Remote Sensing.

The nonstationary and nonlinear brightness temperature signals pose a critical challenge to the precision of quantitative estimation of soil moisture via microwave remote sensing.

This is because the brightness temperature signals received by the sensors are a mixture of various signals, including soil moisture, soil temperature, ground surface roughness, vegetation cover, and atmospheric conditions. Researchers have been looking forward to being able to extract soil moisture precisely, according to Li Xin, an ITP researcher.

The study team explored the introduction of BSS technology into soil moisture estimation by decomposing mixed microwave data.

"Suppose you are at a noisy party where you can hear music, people talking and cups clinking all at the same time. BSS is similar to a kind of 'sound separation technique.' Even if you don't know where each sound is coming from, BSS can separate them one by one," Jin explained. This tech-solution can also decompose the mixed information in remote sensing signals.

The research team developed an innovative approach to estimate soil moisture, based on an in-depth understanding of the structural characteristics of microwave brightness temperature signals over time, combined with single-channel and multi-channel BSS technology.

This new method constructed a robust mapping relationship between the source signals and the soil moisture, enabling high-precision estimation of soil moisture.

It bypassed the challenges of remote sensing-based soil moisture retrieval, which is affected by variables such as surface roughness and vegetation cover.

Experiments conducted on the Qinghai-Tibet Plateau showed that this new method is applicable and stable.

The new method boasts a strong capability to disentangle nonlinear and multi-source mixed signals efficiently.

It not only has theoretical significance and proposes a new application method for soil moisture estimation, but also offers an innovative solution for estimating other geophysical variables, according to Li.

Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
主站蜘蛛池模板: 凤阳县| 宾川县| 仁寿县| 汪清县| 肇东市| 新河县| 通道| 南木林县| 云龙县| 扎囊县| 呼玛县| 苍梧县| 福建省| 台中市| 岳西县| 武平县| 三江| 乡宁县| 濮阳县| 香港 | 绵阳市| 贵溪市| 虞城县| 澜沧| 东阿县| 天峻县| 天长市| 连城县| 庆云县| 兴文县| 双流县| 关岭| 桐乡市| 安陆市| 临沧市| 扬中市| 慈利县| 潼关县| 宁河县| 响水县| 平顶山市|