Preliminary results from Woomera gamma radiometrics survey
Raphael Viscarra Rossel & Gordon McLachlan
Below are the preliminary results from the Woomera gamma radiometrics survey. The data
shown are the raw data without any post-processing. Please note that the K, U and Th
gamma channels (particularly the U and Th) have low signal:noise. Reason is that they need
longer integration times during measurement as they are weaker signals. We deal with the
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problem of short integration time by spatially aggregating the data as in Viscarra Rossel et
al. (2007). We will do the spatial aggregation (which will improve the signal:noise) and other
data post-processing to derive the final fine spatial resolution maps of each of the gamma
channels subsequently.
Please note that the units are in counts per second. We can try to derive concentrations for
each of the K, U and Th, based on the last gamma calibration that we made (Gordon to
check please). Below w
BY e also provide the relative elevation that we measured during the
survey.
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Viscarra Rossel, RA, Taylor HJ, McBratney AB. 2007. Multivariate calibration of hyperspectral
-ray energy spectra for proximal soil sensing.
European Journal of Soil Science 58: 343–353.
Histograms of the gamma data
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Maps of the sensor tracks for each of the gamma channels: total dose (TD), K, U, and Th
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Relative elevation
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