By Stephen David Billings
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Extra resources for Geophysics of Soil Mapping Using Airborne Gamma-Ray Spectrometry(Billings,PhD Thesis, 1998)
General practice is to interpolate to a grid 30 spacing of one-quarter to one-fifth of the line spacing using one of several commercially available interpolation packages. The interpolation aids both visualisation and interpretation and also enables manipulation within widely available image processing and GIS software. , 1998). 4 SOIL MAPPING USING AIRBORNE GAMMA-RAY SPECTROMETRY Now that I have reviewed the fundamentals of airborne gamma-ray spectrometry I turn to the issue of applying the technique to soil mapping.
Existing techniques for soil survey rely heavily on air-photo interpretation, or in some instances analysis of satellite imagery. On aerial photography, soil landscapes with different sets of attributes are discriminated by differences in colour, tone and texture. However, only the surface of the soil is directly visible and then only when the vegetation is sparse or absent. Therefore, differences in soil properties are generally inferred indirectly from land form and patterns of vegetation. Land forms can be identified on aerial-photographs by their structure, relief, and drainage pattern under stereo viewing and reflect the underlying rocks or materials, the history of weathering, erosion and deposition.
We therefore come to the first objective of the thesis which is addressed in Chapter 3. Objective 1: Develop a model of gamma-ray spectrometry that accounts for the shape of the detector and the movement of the aircraft during the integration time. The assay uncertainty of a survey (ratio of standard deviation to mean value) is important to quantify as it influences the suitability of the data for the intended purpose. For example, the uranium channel in the radiometric data interpreted by Gourlay et al.