Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Soil Mapping"”.
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Developing and evaluating a method to disaggregate legacy SSURGO soil maps
For soil mapping, legacy (survey) data has its greatest potential in the disaggregation of complex soil mapping units. Disaggregation in this context is possible by relating different soils within a single map unit to other known characteristics of the landscape such as slope and curvature. For the …
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Spatial variability of soil and relationship with satellite digital data in eastcentral Illinois
… imagery is of little use in large scale soil mapping, because they found few relationships between satellite-derived maps and field soil maps. Rather than evaluate imagery-derived maps by their degree of spatial correspondence with a field soil map, it seems preferable to judge the field …
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Predicting soil properties using machine learning: a smartphone solution for stakeholders
Soil health is foundational to agricultural productivity, ecosystem sustainability, and climate regulation, yet traditional methods for assessing soil properties are labour-intensive, costly, and limited in spatial resolution. This thesis addresses these limitations by integrating machine learning …
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Improved Environmental Characterization to Support Natural Resource Decision Making: (1) Distributed Soil Characterization, and (2) Treatment of Legacy Nutrients
… address two environmental concerns: (1) accurate soil mapping and (2) treatment of nitrogen to affect water quality change.The current method of soil mapping, SSURGO (USDA‐NRCS Soil survey), is often erroneous and misleading. Two studies in this dissertation are conducted to evaluate the potential …
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Remote Sensing for Precision Agriculture: Within -Field Spatial Variability Analysis and Mapping With Aerial Digital Multispectral Images
… of color infrared (CIR) image of a field soil was able to identify soil mapping units with an average accuracy of 76%. Spectral reflectance from a crop field was highly correlated to the chlorophyll reading. A regression model developed to predict nitrogen stress in corn identified …
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New regolith mapping approaches for old Australian landscapes.
… assessment and civil engineering. Furthermore, mapping regolith is critical in understanding the origin and evolution of regolith through space and time. Mapping the regolith and formulation of associated robust process models are in their infancy compared with geological and soil mapping, which …
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Utilizing Remotely Piloted Air Systems in the Delineation of Functional Land Management Zones
… medium through which food production occurs: the soil. Soil provides many of the ecosystem services provided by farmland and is essential for functions such as food production, water storage, carbon cycling and storage, functional and intrinsic biodiversity, as well as nutrient cycling. In order …
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A spatially responsive catchment model for predicting stormwater runoff from ungaged watersheds
… infiltration equation was used as the basis of a soil moisture routine to estimate rainfall excess from a given rainfall distribution. The finite element technique, with Galerkin's residual method, was used to provide a numerical solution of the equations of continuity and momentum for …
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An approach to map soil texture class on the Iowan Erosion Surface
The objective of this digital soil mapping (DSM) research was to compare approaches of new and legacy dataset combination to produce surface soil texture class maps on the Iowan Erosion Surface physiographic region (MLRA 104) using standard and novel predictor variables (covariates) for modeling. …
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Soil Morphological, Physical, and Chemical Parameters Affecting Longleaf Pine (Pinus palustris) Site Quality and Ecosystem Restoration Potential in East Texas
… to the lack of emphasis on selection of suitable soils. Historically, longleaf pine was found on soils with a wide range of soil properties, including higher quality soils, due to frequent fires which kept many competing species suppressed. Decline in longleaf pine coverage has been attributed to …
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Site Quality Classification for Mapping Forest Productivity Potential on Mine Soils in the Appalachian Coalfield Region
… mine land properties. However, conventional mapping techniques using USDA soil series does not identify these critical soil property differences. This study was conducted to create a forest site quality classification system to be used to evaluate the potential productivity of specific tree …
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Mapping and Assessment of Land Use/Land Cover Using Remote Sensing and GIS in North Kordofan State, Sudan
… vegetation cover as an indicator. Preliminary mapping of major soil types is also an objective of this study. Landsat data of MSS 187/51 acquired on 01.01.1973 and ETM+ 174/51 acquired on 16.01.2001 were used. Visual interpretation in addition to digital image processing was applied to process …
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Multi-temporal remote sensing for estimation of plant available water-holding capacity of soil
Soil maps are fundamental for agricultural management. However, mapping soils is a difficult task because of their high spatial variability and the challenge of choosing representative field sites for soil analysis. Globally, soil information is becoming a prioritized agenda, due to the increasing …
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Soil-Landscape Modelling in an Andean Mountain Forest Region in Southern Ecuador
Soil-landscapes are diverse and complex due to the interaction of pedogenetic, geo-morphological and hydrological processes. The resulting soil profile reflects the balance of these processes in its properties. Early conceptual models have by now resulted into quantitative soil-landscape models …
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Advanced data analysis methods to optimize crop management decisions
… and management, and environment variables from soil mapping and gridded weather datasets. Random forest models were trained with the dataset and explained up to 75% of the variation. However, the ability of the model to predict crop performance in future weather scenarios was limited. Overall, …
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Comparison of Techniques for Estimation of Forest Soil Carbon
Soil organic carbon represents the largest constituent of the global C pool and carbon budgets are studied by researchers and modelers in C cycling, global climate change, and soil quality studies. Pedon and soil interpretation record databases are used with soil and ecological maps to estimate …
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Assessment of SWAT to Enable Development of Watershed Management Plans for Agricultural Dominated Systems under Data-Poor Conditions
… outputs due to input parameters, specifically soils and high resolution digital elevation models, which are likely to be lacking in data-poor environments, was quantified using Monte Carlo simulation. Two sources of soil parameter values (SSURGO and STATSGO) were investigated, as well as three …
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SOIL SALINITY AND SODICITY OF GALVESTON AND PELICAN ISLANDS, TEXAS
… of the island with seawater, causing elevated soil salinity levels that killed much of the vegetation on the island, including tens of thousands of trees. Residual salinity in soils and groundwater has hampered vegetation re-establishment in some areas.</p> <p>This project aims to create a map …
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