By Stephen David Billings
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Concerning the ProductPublished via the yank Geophysical Union as a part of the Geophysical Monograph sequence. content material:
Extra resources for Geophysics of Soil Mapping Using Airborne Gamma-Ray Spectrometry(Billings,PhD Thesis, 1998)
Can obscure variations caused by soil changes. Soil mapping is then very difficult, especially in disturbed areas with low relief, as occurs in the majority of Australia’s agricultural land. Airborne radiometrics maps the distribution of potassium, uranium and thorium (and also the total radioactivity) in the top 30 cm or so of soil. The distribution of these elements in the landscape is controlled by many of the same factors important in determining the distribution of soils. This suggests that radiometrics may provide an effective method for stratification of field sampling, and for spatial prediction of soil properties, especially in areas of low relief.
To investigate the improvement that can be achieved by a multichannel technique, Hovgaard applied his NASVD technique to the survey. The first four spectral components along with the mean spectra were used to construct cleaned spectra for the survey. These were then processed using exactly the same parameters as the standard 4-channel method and the unlevelled data interpolated to the same 25 m grid using the same method (Figure 7; Table 4). The visual improvement in the data is 41 Potassium Uranium Pot Figure 7: NASVD processing of the 100 m elevation potassium, uranium, thorium and total count data.
Therefore, the average soil properties within a class may not relate very well to the actual soil properties measured in that class. Even though the Gourlay et al. maps are unable to reliably predict soil properties over the whole survey area they may possibly be used to discriminate local differences in soils. To assess this possibility I performed an analysis of variance on Gourlay et al’s. radiometric classes (as factors) against our measured soil properties. As our survey area represents a small proportion of the total survey area, this analysis would show whether radiometric classes have relatively consistent soil properties in a local area.