نتایج جستجو برای: ordinary kriging ok was suitable for ph

تعداد نتایج: 11235498  

Journal: :Remote Sensing 2021

Precipitation data provide a crucial input for examining hydrological issues, including watershed management and mitigation of the effects floods, drought, landslides. However, they are collected frequently from scarce often insufficient network ground-based rain-gauge stations to generate continuous precipitation maps. Recently, maps derived satellite have not been sufficiently linked rain gau...

Journal: :Applied Water Science 2023

Abstract Reference evapotranspiration (ET 0 ) estimates are commonly used in hydrologic planning for water resources and agricultural applications. Last 2 decades, machine learning (ML) techniques have enabled scientists to develop powerful tools study ET patterns the ecosystem. This investigated feasibility effectiveness of three ML techniques, including k -nearest neighbor algorithm, multigen...

Journal: :Environmental Modelling and Software 2021

In this study, a spatiotemporal estimation method based on Funk singular value decomposition (F-SVD) that considers the correlation of rainfall is proposed to improve estimations from gauge observations. Hourly data several flood events are selected verify by comparing with Inverse Distance Weighting (IDW) and Ordinary Kriging (OK) in Hanjiang basin, China. The results show (1) F-SVD has best p...

Journal: :ISPRS international journal of geo-information 2022

Geostatistical estimation methods rely on experimental variograms that are mostly erratic, leading to subjective model fitting and assuming normal distribution during conditional simulations. In contrast, Machine Learning Algorithms (MLA) (1) free of such limitations, (2) can incorporate information from multiple sources therefore emerge with increasing interest in real-time resource automation...

2002
V. Demyanov M. Kanevsky S. Chernov E. Savelieva V. Timonin

Direct Neural Network Residual Kriging (DNNRK) is a two step algorithm (Kanevsky et al. 1995). The first step includes estimating large scale structures by using artificial neural networks (ANN) with simple sum of squares error function. ANN, being universal approximators, model overall non-linear spatial pattern fairly well. ANN are model free estimators and depend only on their architecture a...

Journal: :Water Air and Soil Pollution 2022

Abstract This study aims to assess the urban air quality, and map NO 2 , SO PM 10 profiles using two widely spatial interpolation methods, ordinary kriging (OK) inverse distance weighting (IDW) by estimating their concentrations at distinct non-monitored locations. Assessment mapping of pollutants in this help with policy formulation decision-making. Kota, industrial educational hub Rajasthan (...

Journal: :محیط شناسی 0
کریم سلیمانی استاد مرکز rs و gis دانشکدة منابع طبیعی ساری جلال زندی استاد مرکز rs و gis دانشکدة منابع طبیعی ساری سیران زندی دانشجوی کارشناسی ارشد آبخیزداری دانشگاه علوم کشاورزی و منابع طبیعی ساری

the aim of this study was to determine the best interpolation method to achieve spatial and quality distribution of springs from point view (tds) and ph in mirdeh watershed nw kurdistan province. field sampling collections was done and 268 springs of total 904 springs of whole watershed selected randomly. electrical conductivity and ph of springs was determined and 168 springs was used as train...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید بهشتی - دانشکده علوم 1371

we describe here a suitable approach for the synthesis of n-unsubstituted monocyclic b-lactams under mild reaction conditions by the annelation of imines with substituted acetylchlorides. in this method the reaily available phtalimidoacetyl chloride were allowed to react with - dibenzylideneiminotoluene (hydrobenzamide) in the presence of an equimolar amount of triethylamine in refluxing toluen...

ژورنال: علوم آب و خاک 2016
تقی‌زاده مهرجردی, روح‌الله, حجتی, سعید, سواری, زهرا,

Salinity and alkalinity decreases physical, chemical and biological quality of soils and as a result reduces crop yield. This study aims to evaluate spatial variability of soil salinity in Ahvaz using geostatistical approaches. Accordingly, 69 surface soil samples (0-10 cm) were collected and their electrical conductivities (EC) were measured in 1:1 soil: water extracts. The data were then anal...

Journal: :Air, soil and water research 2022

Iranshahr Basin is located in the Sistan and Baluchistan province, subject to severe drought excessive groundwater utilization. Over-reliance on resources this area has led aquifer drawdowns socio-economic problems. The present study aimed identify appropriate sites for Artificial Recharge Groundwater (ARG) a single platform by applying GIS fuzzy logic spatial modeling. Three stages were perfor...

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