Results 11 to 20 of about 902,226 (264)

A Generalized Water Quality Index for Taiwan [PDF]

open access: yesEnvironmental Monitoring and Assessment, 2004
By exploring the behavior and limitations of conventional methods for quality evaluation, a better overall index for water quality in Taiwan and its application in Keya River are proposed. The thirteen variables are employed for the quality assessment.
Liou, Shiow-Mey   +2 more
openaire   +2 more sources

Pengaruh Keberadaan Bandar Udara Kelas III Seko Luwu Utara Terhadap Index Pencemaran Air

open access: yesJurnal Teknik, 2020
The airport is one of the best transportation systems capable of moving people quickly as fast economic growth is followed by rapid population growth.
M.Ichsan Ali, Muh. Rais Abidin
doaj   +1 more source

Multi-year mapping of flood autumn irrigation extent and timing in harvested croplands of arid irrigation district

open access: yesGIScience & Remote Sensing, 2022
Flood irrigation after crop harvest, e.g. autumn irrigation (AI), is a common irrigation practice in arid and semi-arid regions like Hetao Irrigation District (HID) in Northwest China to increase soil moisture and leach soil salt.
Ximin Qian   +4 more
doaj   +1 more source

The Total Operating Characteristic from Stratified Random Sampling with an Application to Flood Mapping

open access: yesRemote Sensing, 2021
The Total Operating Characteristic (TOC) measures how the ranks of an index variable distinguish between presence and absence in a binary reference variable.
Zhen Liu, Robert Gilmore Pontius Jr
doaj   +1 more source

Index-Based Spatiotemporal Assesment Of Water Quality In Tarbela Reservoir, Pakistan (1990−2020)

open access: yesGeography, Environment, Sustainability, 2023
Anthropogenic activities can greatly influence the lake ecosystems across the globe. Within these ecosystems, the impacts of human activities are most evident on sedimentation, light and nutrient availability, and disturbance frequency.
Nausheen Mazhar   +5 more
doaj   +1 more source

Evaluation of Water Extraction Indices Using Landsat Satellite Images (Case Study: Gamasiab River of Kermanshah) [PDF]

open access: yesتحقیقات کاربردی علوم جغرافیایی, 2020
Water is one of most important human needs for life. According to importance of subject, discussion of management and utilization of water resources has become one of the most important global issues.
sayyad asghari   +4 more
doaj  

Channel Activity Remote Sensing Retrieval Model: A Case Study of the Lower Yellow River

open access: yesRemote Sensing, 2023
Meandering channel migration is a widespread phenomenon in rivers all around the world. Channel activity, which reflects the rate of change of a meandering channel, is calculated by averaging lateral channel migration.
Taixia Wu   +4 more
doaj   +1 more source

The Photochemical Reflectance Index (PRI) as a water-stress index

open access: yesInternational Journal of Remote Sensing, 2002
Measurements of leaf reflectance in two narrow wavelength bands centred around 531 and 570 nm were carried out during withering of two contrasting functional and structural plant types: Chenopodium quinoa (Willd.) and Arbutus unedo (L.). The Photochemical Reflectance Index (PRI)=( R 531 - R 570 )/ ( R 531 + R 570 ) was calculated.
Thénot, Franck   +2 more
openaire   +3 more sources

Salmonellae as an Index of Pollution of Surface Waters [PDF]

open access: yesApplied Microbiology, 1972
Screening enrichments of surface water specimens by means of a polyvalent fluorescent antibody reagent for the salmonellae yielded approximately 60% more positive specimens than was obtained by cultural procedures. It is not known what fraction of the excess of fluorescent antibody-positive over culturally positive specimens represents ...
W B, Cherry   +5 more
openaire   +2 more sources

Automatic Methodology to Detect the Coastline from Landsat Images with a New Water Index Assessed on Three Different Spanish Mediterranean Deltas

open access: yesRemote Sensing, 2019
Due to the importance of coastline detection in coastal studies, different methods have been developed in recent decades in accordance with the evolution of measuring techniques such as remote sensing. This work proposes an automatic methodology with new
Sandra Paola Viaña-Borja   +1 more
doaj   +1 more source

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