نتایج جستجو برای: mndwi

تعداد نتایج: 147  

Journal: :Environmental Modelling and Software 2022

This work introduces Sentinel-1 based Inland water dynamics Mapping System (SIMS), an open-source web application developed to enable automated mapping of inland using radar imagery. SIMS relies on a novel framework built Python and Google Earth Engine. The underlying algorithm involves simple binary thresholding technique outlier removal method tailored perform efficiently across complicated f...

Journal: :Applied sciences 2021

Monitoring open water bodies accurately is important for assessing the role of ecosystem services in context human survival and climate change. There are many methods available body extraction based on remote sensing images, such as normalized difference index (NDWI), modified NDWI (MNDWI), machine learning algorithms. Based Landsat-8 this study focuses effects six algorithms three threshold us...

برخلاف سنجنده‏های اپتیکی که تحت تأثیر عوامل محیطی مانند دود، مه، ابر، و میزان نور خورشید قرار می‏گیرند، سنجنده‏های راداری با روزنة مجازی در همة ساعات شبانه‏روز و همه نوع شرایط آب و هوایی توانایی اخذِ داده را دارند. بنابراین، هدف از این تحقیق ارزیابی قابلیت باند‏های راداری برای استخراج خصوصیات بیوفزیکی سطح زمین است. در این مطالعه از داده‏های ماهواره‏ای لندست-8 و باندهای پلاریمتریک VV و VH سنتینل-...

Journal: :Remote Sensing 2022

In this work, we aim to evaluate the feasibility and operational limitations of using Sentinel-1 synthetic aperture radar (SAR) data monitor water levels in Poço da Cruz reservoir from September 2016–September 2020, semi-arid region northeast Brazil. To segment water/non-water features, SAR backscattering thresholding was carried out via graphical interpretation backscatter coefficient histogra...

Journal: :Sustainability 2023

Currently, natural hazards are a significant concern as they contribute to increased vulnerability, environmental degradation, and loss of life, among other consequences. Climate change human activities key factors that various such floods, landslides, droughts, deforestation. Assam state in India experiences annual floods significantly impact the local environment. In 2022, flooding affected a...

Journal: :Sustainability 2023

Considering the global impact on society due to tailings storage facilities (TSFs) accidents, this article describes a study monitor mine management and prevent mining dam failures, considering analysis of different TSFs real cases. The spatial temporal dynamic behavior supernatant process water pond is studied as critical issue, using remote sensing techniques based multispectral satellite ima...

Journal: :Applied Geomatics 2022

Uncontrolled tourism activities cause the destruction of nature and deterioration ecological balance. Since coastal areas are both economically socially important, monitoring shoreline changes has become one important research areas. Monitoring short-term long-term in is to prevent damages that may occur due natural human factors protect shorelines. In this study, which an tourist city Antalya,...

Journal: :Remote Sensing 2021

The accurate and efficient extraction of urban areas is great significance for better understanding sprawl, built environment, economic activities, population distribution. Night-Time Light (NTL) data have been widely used to extract areas. However, most the existing NTL indexes are incapable identifying non-luminous built-up high-resolution imagery derived from Luojia 1-01 satellite, with low ...

هدف از این پژوهش تلفیق الگوریتم CART و شاخص­های پوشش گیاهی برای ارتقاء صحت نقشه­سازی جنگل­های مانگرو با استفاده از تصویر ماهواره­ای لندست 8 است. در این پژوهش هفت شاخص پوشش گیاهی DVI، NDVI، NDII، IPVI، MNDWI، SAVI و OSAVI محاسبه شد. سپس با استفاده از الگوریتم CART در نرم­افزار R شاخص­های مهم و حد آستانه آن­ها­ شناسایی و سرانجام نقشه اراضی مانگرو و اراضی پیرامون آن با روش درخت تصمیم­گیری تهیه شد....

Journal: :Remote Sensing 2023

The change in land-use diversity is attributed to the anthropogenic factors sustaining life. surface water bodies and other crucial natural resources study area are being depleted at an alarming rate. This explored implications of changing on by using a random forest (RF) classifier machine-learning algorithm remote-sensing models Gauteng Province, South Africa. Landsat datasets from 1993 2022 ...

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