Consulta: subjectFacets:"Soil survey"
Registros recuperados: 15
Data/hora: 11/06/2024 08:58:05

Aspectos metodológicos do trabalho de campo para caracterização de solos a partir do saber local: estudo de caso no norte de Minas Gerais.
Provedor de dados: 14
Autores: CORREIA, J. R.; ANJOS, L. H. C. dos; NEVES, D. P.; LIMA, A. C. S.; TOLEDO, L. de O.; CALDERANO FILHO, B.
ABSTRACT: Despite of all modem communications tools, difficulties of dialogue still exist between technicians and local community members when dealing with natural resources. This is related to many factors, from the predominantly technical formation of the teachers and researches to the difficult of local population members to be understood about their relationship with the surrounding environment. In the case of Soil Science, this problem also occurs. Proposals for planning soil sustainable usage, usually, are compromised because the do not consider the local knowledge, especially in rural communities, where there is no basic material compatible to the work scale needed. The approach of observing the environment and how humans interact with it, from the...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Mapeamento; Conhecimento local; Soil survey; Mapping; Soil sciences; Local knowledge.; Classificação do Solo; Comunidade Rural; Pedologia; Reconhecimento do Solo.; Soil classification.; Rural communities.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/570243

HOW SOIL FORMING PROCESSES DETERMINE SOIL-BASED VITICULTURAL ZONING
Provedor de dados: 126
Autores: Ubalde,J.M; Sort,X; Poch,R.M.
The aim of this study was to elucidate the soil forming processes of representative vineyard soils, and to discuss the implications on a soil-based viticultural zoning at very detailed scale. The study area is located in Priorat, Penedes and Conca de Barbera viticultural areas (Catalonia, North-eastern Spain). The studied soils belong to representative soil map units determined at 1:5,000 scale, according to Soil Taxonomy classification. The soil forming processes, identified through morphological and micromorphological analyses, have significant effects on some soil properties. For example, the different processes of clay accumulation in soils developed from granodiorites in Priorat or gravel deposits in Conca de Barbera, are primarily responsible for...
Tipo: Journal article
Palavras-chave: Soil formation; Soil micromorphology; Soil survey; Soil classification.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000100009

Multinomial Logistic Regression and Random Forest Classifiers in Digital Mapping of Soil Classes in Western Haiti
Provedor de dados: 90
Autores: Jeune,Wesly; Francelino,Márcio Rocha; Souza,Eliana de; Fernandes Filho,Elpídio Inácio; Rocha,Genelício Crusoé.
ABSTRACT Digital soil mapping (DSM) has been increasingly used to provide quick and accurate spatial information to support decision-makers in agricultural and environmental planning programs. In this study, we used a DSM approach to map soils in western Haiti and compare the performance of the Multinomial Logistic Regression (MLR) with Random Forest (RF) to classify the soils. The study area of 4,300 km2 is mostly composed of diverse limestone rocks, alluvial deposits, and, to a lesser extent, basalt. A soil survey was conducted whereby soils were described and classified at 258 sites. Soil samples were collected and subjected to physical and chemical analyses. Recursive Feature Elimination (RFE) was used to select the most important covariates from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Auxiliary data; Digital soil mapping; Soil survey; Data-mining.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100306

Mapping Soil Cation Exchange Capacity in a Semiarid Region through Predictive Models and Covariates from Remote Sensing Data
Provedor de dados: 90
Autores: Chagas,César da Silva; Carvalho Júnior,Waldir de; Pinheiro,Helena Saraiva Koenow; Xavier,Pedro Armentano Mudado; Bhering,Silvio Barge; Pereira,Nilson Rendeiro; Calderano Filho,Braz.
ABSTRACT: Planning sustainable use of land resources requires reliable information about spatial distribution of soil physical and chemical properties related to environmental processes and ecosystemic functions. In this context, cation exchange capacity (CEC) is a fundamental soil quality indicator; however, it takes money and time to obtain this data. Although many studies have been conducted to spatially quantify soil properties on various scales and in different environments, not much is known about interactions between soil properties and environmental covariates in the Brazilian semiarid region. The goal of this study was to evaluate the efficiency of random forest and cokriging models applied to predict CEC in the Brazilian semiarid region. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Data mining; Geostatistics; Landsat 5; Legacy data; Soil survey.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100311

An appropriate data set size for digital soil mapping in Erechim, Rio Grande do Sul, Brazil
Provedor de dados: 90
Autores: Caten,Alexandre ten; Dalmolin,Ricardo Simão Diniz; Pedron,Fabrício de Araújo; Ruiz,Luis Fernando Chimelo; Silva,Carlos Antônio da.
Digital information generates the possibility of a high degree of redundancy in the data available for fitting predictive models used for Digital Soil Mapping (DSM). Among these models, the Decision Tree (DT) technique has been increasingly applied due to its capacity of dealing with large datasets. The purpose of this study was to evaluate the impact of the data volume used to generate the DT models on the quality of soil maps. An area of 889.33 km² was chosen in the Northern region of the State of Rio Grande do Sul. The soil-landscape relationship was obtained from reambulation of the studied area and the alignment of the units in the 1:50,000 scale topographic mapping. Six predictive covariates linked to the factors soil formation, relief and organisms,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Decision tree; Pedometry; Soil survey; Mapping unit.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000200007

Digital soil mapping: strategy for data pre-processing
Provedor de dados: 90
Autores: Caten,Alexandre ten; Dalmolin,Ricardo Simão Diniz; Ruiz,Luis Fernando Chimelo.
The region of greatest variability on soil maps is along the edge of their polygons, causing disagreement among pedologists about the appropriate description of soil classes at these locations. The objective of this work was to propose a strategy for data pre-processing applied to digital soil mapping (DSM). Soil polygons on a training map were shrunk by 100 and 160 m. This strategy prevented the use of covariates located near the edge of the soil classes for the Decision Tree (DT) models. Three DT models derived from eight predictive covariates, related to relief and organism factors sampled on the original polygons of a soil map and on polygons shrunk by 100 and 160 m were used to predict soil classes. The DT model derived from observations 160 m away...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Choropleth map; Pedometrics; Soil survey; Decision tree.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000400003

How is the learning process of digital soil mapping in a diverse group of land use planners?
Provedor de dados: 90
Autores: Dalmolin,Ricardo Simão Diniz; Moura-Bueno,Jean Michel; Samuel-Rosa,Alessandro; Flores,Carlos Alberto.
ABSTRACT The use of new technologies, the development of new software, and the advances in the machines ability to process data have brought a new perspective to soil science and especially to pedology, with the advent of digital soil mapping (DSM). To meet the demand for soil surveys in Brazil, it will be necessary to popularize the techniques used in DSM. To identify and map the soil to generate maps of land use capability, we proposed a theoretical and practical course focused on the training in DSM for professionals involved in the management of land resources. The methodology was divided into five modules: I. Introduction to pedology, soil-landscape relationship, soil survey and soil classification (theory); II. Identification of soils in the field...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Expert knowledge; Pedometry; PronaSolos; Soil education; Soil survey.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832020000100600

In situ separation of soil types along transects employing Vis-NIR sensors: a new view of soil evaluation
Provedor de dados: 124
Autores: Fiorio,Peterson Ricardo; Demattê,José Alexandre Melo; Nanni,Marcos Rafael; Genú,Aline Marques; Martins,Juliano Araujo.
Soil components, such as organic matter, the levels and form of iron oxides, moisture and texture, influence the interaction of the soil with electromagnetic energy, so that knowledge of the energy reflected by different classes of soil is therefore of help in their discrimination. The aim of this study was to evaluate the possibility of differentiating classes of soils along two transects, by means of the field spectral behaviour of different classes, using both visual and multivariate statistical analysis. Equidistant points were marked along the transects, 100 m apart, where geo-referenced soil samples were collected from the surface layer at a depth of 0 to 0.20 m. In the area under study, ten classes of soil were described by means of laboratory...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Remote sensing; Soil survey; Reflectance; Soil spectroradiometry.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000300002

Digital soil mapping using multiple logistic regression on terrain parameters in southern Brazil
Provedor de dados: 63
Autores: Giasson,Elvio; Clarke,Robin Thomas; Inda Junior,Alberto Vasconcellos; Merten,Gustavo Henrique; Tornquist,Carlos Gustavo.
Soil surveys are necessary sources of information for land use planning, but they are not always available. This study proposes the use of multiple logistic regressions on the prediction of occurrence of soil types based on reference areas. From a digitalized soil map and terrain parameters derived from the digital elevation model in ArcView environment, several sets of multiple logistic regressions were defined using statistical software Minitab, establishing relationship between explanatory terrain variables and soil types, using either the original legend or a simplified legend, and using or not stratification of the study area by drainage classes. Terrain parameters, such as elevation, distance to stream, flow accumulation, and topographic wetness...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GIS; DEM; Soil survey; Terrain analysis.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300008

Soil type spatial prediction from Random Forest: different training datasets, transferability, accuracy and uncertainty assessment
Provedor de dados: 63
Autores: Machado,Diego Fernandes Terra; Silva,Sérgio Henrique Godinho; Curi,Nilton; Menezes,Michele Duarte de.
ABSTRACT: Different uses of soil legacy data such as training dataset as well as the selection of soil environmental covariables could drive the accuracy of machine learning techniques. Thus, this study evaluated the ability of the Random Forest algorithm to predict soil classes from different training datasets and extrapolate such information to a similar area. The following training datasets were extracted from legacy data: a) point data composed of 53 soil samples; b) 30 m buffer around the soil samples, and soil map polygons excluding: c) 20 m; and d) 30 m from the boundaries of polygons. These four datasets were submitted to principal component analysis (PCA) to reduce multidimensionality. Each dataset derived a new one. Different combinations of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digital soil mapping; Soil survey; Legacy data.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300243

Decision trees for digital soil mapping on subtropical basaltic steeplands
Provedor de dados: 63
Autores: Giasson,Elvio; Sarmento,Eliana Casco; Weber,Eliseu; Flores,Carlos Alberto; Hasenack,Heinrich.
When soil surveys are not available for land use planning activities, digital soil mapping techniques can be of assistance. Soil surveyors can process spatial information faster, to assist in the execution of traditional soil survey or predict the occurrence of soil classes across landscapes. Decision tree techniques were evaluated as tools for predicting the ocurrence of soil classes in basaltic steeplands in South Brazil. Several combinations of types of decicion tree algorithms and number of elements on terminal nodes of trees were compared using soil maps with both original and simplified legends. In general, decision tree analysis was useful for predicting occurrence of soil mapping units. Decision trees with fewer elements on terminal nodes yield...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GIS; Soil survey; Terrain analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200006

Solum depth spatial prediction comparing conventional with knowledge-based digital soil mapping approaches
Provedor de dados: 63
Autores: Menezes,Michele Duarte de; Silva,Sérgio Henrique Godinho; Mello,Carlos Rogério de; Owens,Phillip Ray; Curi,Nilton.
Solum depth and its spatial distribution play an important role in different types of environmental studies. Several approaches have been used for fitting quantitative relationships between soil properties and their environment in order to predict them spatially. This work aimed to present the steps required for solum depth spatial prediction from knowledge-based digital soil mapping, comparing the prediction to the conventional soil mapping approach through field validation, in a watershed located at Mantiqueira Range region, in the state of Minas Gerais, Brazil. Conventional soil mapping had aerial photo-interpretation as a basis. The knowledge-based digital soil mapping applied fuzzy logic and similarity vectors in an expert system. The knowledge-based...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil survey; Fuzzy logic; Similarity vectors.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400009

การสำรวจและจำแนกพื้นที่ปลูกข้าวไร่และข้าวนาที่สูง เพื่อบ่งชี้สภาวะวิกฤติจากสภาพดินกรด
Provedor de dados: 106
Autores: Sivapong Naruebal.
Survey and classification of highland rice cultivation areas to indicate acid soil crisis was conducted on altitude 700 meters above sea level. Soil sampling was conducted form 7 districts of Mae Hong Son province are namely Muang, Khun Yuam, Mae La Noi, Mae Sariang, Sop Muey, Pai and Pang Ma Pha in the year 2012-2013. A total of 115 soil samples were consisting of 68 paddies and 47 upland conditions. Soil samples were analysis to find out the soil pH. The result showed that the strongly acid, moderately acid and slightly acid are 39.13, 21.74 and 20.86 percentages, respectively. In other hand, the natural, very strongly acid and extremely acid are 8.7, 7.83 and 1.7 percentages, respectively. However 39 percent of upland soil sample and 38 percent of paddy...
Tipo: PhysicalObject
Palavras-chave: Soil survey; Soil classification; Upland rice; Highland paddy; Acid soil; Soil analysis; PH; Mae Hong Son province; การสำรวจดิน; การจำแนกดิน; ข้าวไร่; ข้าวนาที่สูง; ดินกรด; การวิเคราะห์ดิน; พื้นที่สูง; การผลิตข้าว; ความเป็นกรดด่างของดิน; ปฏิกิริยาของดิน; ผลผลิต; จ.แม่ฮ่องสอน.
Ano: 2014
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5711

Bibliometric Analysis for Pattern Exploration in Worldwide Digital Soil Mapping Publications
Provedor de dados: 42
Autores: CANCIAN,LUCIANO C.; DALMOLIN,RICARDO S.D.; CATEN,ALEXANDRE T.
Abstract Bibliometric analyses provide a clear understanding of the scientific performance and relate them with standards of the global scientific production. Soil science is an outstanding and developing field among environmental sciences. Knowledge about soil characteristics and their distribution in the environment has been enriched by the use of new geotechnologies, resulting in what is known as digital soil mapping. Thus, the objective of this work was to characterize the scientific production in digital soil mapping in Brazil and in the world, in the period from 1996 to 2017, in databases such as Scopus and Web of Science. In the general context of increasing numbers of papers, the journal Geoderma published the highest number of related papers....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pedometrics; Soil science; Soil meta-analysis; Soil survey.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703911

Instance selection in digital soil mapping: a study case in Rio Grande do Sul, Brazil
Provedor de dados: 65
Autores: Giasson,Elvio; ten Caten,Alexandre; Bagatini,Tatiane; Bonfatti,Benito.
A critical issue in digital soil mapping (DSM) is the selection of data sampling method for model training. One emerging approach applies instance selection to reduce the size of the dataset by drawing only relevant samples in order to obtain a representative subset that is still large enough to preserve relevant information, but small enough to be easily handled by learning algorithms. Although there are suggestions to distribute data sampling as a function of the soil map unit (MU) boundaries location, there are still contradictions among research recommendations for locating samples either closer or more distant from soil MU boundaries. A study was conducted to evaluate instance selection methods based on spatially-explicit data collection using...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil survey; Data sampling; Model training.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000901592