Pasu Kongapai. Application of remote sensing and geographic information system for estimation of soil organic matter in Nakhonpratom province . Master's Degree(Environmental Planning for Community and Rural Development). Mahidol University. : Mahidol University, 2007.
Application of remote sensing and geographic information system for estimation of soil organic matter in Nakhonpratom province
Abstract:
Organic matter is the major component of soil that is extremely influential on soil
properties, both in physical and biological properties, and also affects the level of soil
fertilities and plant growth. Therefore, provided that we know the organic matter contents in
soil, particularly in agricultural practice we can plan or adjust the areas simply and suitably
prior to planting. The aims of this study were to study some of the soil properties such as soil
organic matter, soil moisture, soil texture, soil color, and soil pH and to estimate the soil
organic matter contents.
The methods of this study were to surveying soil in the study site, Nakhonpratom
province, and sample 120 soil samples based on agricultural land use such as paddy fields,
sugarcane, and fruit orchard areas in order to find the relationship between soil organic matter
contents and spectral reflectance in each band displayed by satellite imagery (Landsat-5TM).
Multiple regression analysis was used to analyze the relationship. The Geographic
Information System (GIS) then was used to interpolate soil organic matter contents by means
of the Inverse Distance Weighted (IDW) method, and the results were validation of the result
interpolation method by Root Mean Square Error (RMSE) method.
According to the results, it was revealed that band 1 (0.45-0.52 μm), band 3
(0.63-0.69 μm), and band 4 (0.76-0.90 μm) were predictors of soil organic matter contents.
The forecasting model of this research was Y = 3.926 + 0.0176 X1 - 0.0117 X3 + 0.0476 X4
(R2=0.357), and the result from the interpolation method presented the error value at
RMSE = 0.95