نتایج جستجو برای: soil mapping

تعداد نتایج: 375443  

Journal: :Journal of Zhejiang University. Science 2004
Bin Zhou Xin-Gang Zhang Ren-Chao Wang

This article presents two approaches for automated building of knowledge bases of soil resources mapping. These methods used decision tree and Bayesian predictive modeling, respectively to generate knowledge from training data. With these methods, building a knowledge base for automated soil mapping is easier than using the conventional knowledge acquisition approach. The knowledge bases built ...

2002
Dhruba Pikha Shrestha

A method is proposed to transform the red and near infrared data into a soil index in order to map soil features. The index maximises soil variation and helps improve soil feature mapping while it suppresses spectral response from vegetation cover. Geo-statistical analysis of fi eld data, on the other hand, helps understand spatial dependency pattern and map it, which may not be directly visibl...

Journal: :آب و خاک 0
اعظم جعفری شمس اله ایوبی حسین خادمی

چکیده شناسایی رقومی خاک ها بهعنوان ابزاری برای ایجاد اطلاعات مکانی خاک، راه حل هایی برای نیاز رو به افزایش نقشه های خاک با تفکیک مکانی بالا را تأمین می کند. بنابراین، باید روش های جدید بهمنظور بهدست آوردن اطلاعات مکانی خاک با تفکیک مکانی بالا توسعه پیدا کند. به همین منظور مطالعه ای جهت پیش بینی کلاس های خاک با استفاده از مدل های رگرسیونی در منطقه زرند کرمان طراحی گردید. در این مطالعه، مدل های ر...

Journal: :تحقیقات آب و خاک ایران 0
مینا ایمانی کارشناس ارشد رشتة خاک شناسی دانشکدة کشاورزی دانشگاه تربیت مدرس حسینعلی بهرامی دانشیار دانشکدة کشاورزی دانشگاه تربیت مدرس رضا سکوتی اسکویی استادیار پژوهش مرکز تحقیقات کشاورزی و منابع طبیعی استان آذربایجان غربی فائزه قربان نژاد کارشناس ارشد رشتة سنجش از دور دانشگاه تربیت مدرس

salinization and alkalization are the most problem in the arid and semi-arid regions, where precipitation is low than evapotranspiration. under such a climatic condition, soluble salts are accumulated in the soil, which cause lessening of the soil productivity and fertility. so, the identification of the salt affected areas is essential for sustainable soil management. the specific objective of...

2010
Thorsten Behrens A-Xing Zhu Karsten Schmidt Thomas Scholten

a r t i c l e i n f o Keywords: Multi-scale digital terrain analysis Feature selection Spatial data mining Digital soil mapping ANOVA Principal components analysis Random subsets Decision trees Terrain attributes are the most widely used predictors in digital soil mapping. Nevertheless, discussion of techniques for addressing scale issues and feature selection has been limited. Therefore, we pr...

2017
Ling Lu Chao Liu Xin Li Youhua Ran

Mapping soil texture in a river basin is critically important for eco-hydrological studies and water resource management at the watershed scale. However, due to the scarcity of in situ observation of soil texture, it is very difficult to map the soil texture in high resolution using traditional methods. Here, we used an integrated method based on fuzzy logic theory and data fusion to map the so...

Journal: :مرتع و آبخیزداری 0
زهره علیجانی کارشناس ارشد علوم و مهندسی خاک، دانشگاه تهران فریدون سرمدیان استاد گروه علوم و مهندسی خاک، دانشگاه تهران سید روح الله موسوی کارشناس ارشد علوم و مهندسی خاک، دانشگاه تهران

today, extensive improvements in fields of soil mapping have increased the purity and accuracy ofsoil maps. usual mapping methods moreover depend on skills and experience of surveyor inidentifying and delineating the boundaries, also need the high cost and time consuming that face thesoil mapping with restrictions. in this study, aerial photographs with 1/40000 scale were used in orderto prepar...

2012
Yiyun Chen Yaolin Liu Yanfang Liu Aiwen Lin Xuesong Kong Dianfeng Liu Xiran Li Yang Zhang Yin Gao Dun Wang

Heavy metal pollution in soil is becoming a widely concerning environmental problem in China. The aim of this study is to integrate multiple sources of data, namely total Cu and Pb contents, digital elevation model (DEM) data, remote sensing image and interpreted land-use data, for mapping the spatial distribution of total Cu and Pb contamination in top soil along the Le'an River and its branch...

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