نتایج جستجو برای: ndwi

تعداد نتایج: 418  

2013
Bangyu Li Hui Zhang Fanjiang Xu

This paper addresses the problem of water extraction from high resolution remote sensing images (including R, G, B, and NIR channels), which draws considerable attention in recent years. Previous work on water extraction mainly faced two difficulties. 1) It is difficult to obtain accurate position of water boundary because of using low resolution images. 2) Like all other image based object cla...

تغییر خصوصیات بیوفیزیکی سطح زمین یکی از مهم‏ترین اثرهای منفی فعالیت‏های انسانی است. هدف از پژوهش حاضر تلفیق قابلیت‏های سنجش از دور انعکاسی و حرارتی برای بررسی و پایش روند تغییرات خصوصیات بیوفیزیکی سطح منطقة معدن مس سونگون ناشی از فعالیت‏های معدنی طی سه دهة گذشته است. بدین‏منظور، از مجموعة داده‏های انعکاسی و حرارتی تصاویر ماهواره‏ای، ایستگاه‏های هواشناسی، و بازدید زمینی استفاده شده است. در این پ...

Journal: :Water 2022

Marshlands in arid and semi-arid areas are considered constantly changing environments due to unsecured water supplies as a result of high evapotranspiration limited highly variable rainfall. Classification marshlands these regions mapping their land cover is not an easy task maps need be upgraded frequently. Satellites provide enormous amounts information data for the continuous monitoring cha...

یکی از مشکلات مهم بوم‌شناسان شناسایی بهترین شاخص‌ها جهت استفاده در تجزیه و تحلیل‌های کمی جنگل و پوشش‌های گیاهی می‌باشد. هدف از این تحقیق ارزیابی حساسیت شاخص‌های طیفی گیاهی نسبت به مشخصه حجم سرپا، جهت انتخاب بهترین شاخص طیفی گیاهی برای تهیه مدل حجم سرپا و مقایسه آن با مدل حاصل شده از روش رگرسیون بهترین زیر‌مجموعه می‌باشد. همچنین حساسیت این شاخص‌ها نسبت به یکدیگر با استفاده از تابع حساسیت نسبی ار...

Journal: :international journal of energy and water resources 0
abbass malian department of geomatic engineering, shahid rajaee teacher training university hani rezayan department of rs-gis, faculty of geographic sciences, kharazmi university mohammad sakkizadeh department of environmental sciences, shahid rajaee teacher training university zinat farhang faculty of geo-information science and earth observation, university of twente

satellite data have been used for temperature modeling both in urban areas and water. this paperstudies viability of aster satellite images that provide high spatial and spectral resolution to model watersurface temperature, as a fundamental water quality parameter. this study is focused on dez dam reservoirresiding in khuzestan province, south west of iran. after the image corrections required...

Journal: :journal of agricultural science and technology 2016
s. zhao q. wang y. yao s. du c. zhang

water content plays an important role in the process of plant photosynthesis and biomass accumulation. many methods have been developed to retrieve canopy leaf water content from remote sensing data. however, the validity of these methods has not been verified, which limits their applications. this study estimates the leaf water content (lwc) of winter wheat with three most widely used indexes:...

Journal: :Pfg – Journal Of Photogrammetry, Remote Sensing And Geoinformation Science 2022

Abstract Peatlands as natural carbon sinks have a major impact on the climate balance and should therefore be monitored protected. The hydrology of peatland serves an indicator storage capacity. Hence, we investigate question how suitable different remote sensing data are for monitoring size open water surface table depth (WTD) ecosystem. Furthermore, examine potential combining this purpose. W...

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