Mineral Occurrence Maps of Australia - MOMAs
The following MOMAs are available at the moment:
Alteration Minerals: Pyrophyllite, Dickite and Apatite
Aluminosilicate Minerals : Andalusite, Kyanite, and Sillimanite
Metamorphic Minerals: Axinite, Cordierite, Datolite, Wollastonite, Garnet, Serpentine
REE Occurrences: Detection based on the Nd lines in the VNIR
Properties: The layers in this this MOMA reflect information about the hole that can provide an indication of the reliability of the TSA+ and jCLST interpretations. The current layers are:
Because CorStruth has easy access to all the NVCL HyLogger-3 data sets it is possible to search all the holes and extract information that might be useful for research or economic purposes. This can then be displayed using Google Maps.The production of these maps is a three stage process
But it is also possible to display any other property that can be generated from the raw hyperspectral data. Instrumental measurements like the Signal-to-Noise Ratio or some measure of the core condition based on the laser profilometer are possible. Alternatively scalars based on spectral features such as the wavelength or depth of selected absorption features are possible.
Occurrences: This is a simple measure of the number samples in the hole that have the property. It is useful for less-common minerals that generally occur infrequently. The Aluminosilicate MOMA is a good example.
Average Abundance: This is a rough guide to proportion of the property in the hole. For example the Average Abundance of quartz would be the fraction of quartz seen by jCLST averaged over every unmasked sample in the hole.
Interval Maximum: Here a moving window average abundance of the scalar is computed for every unmasked sample and the maximum of this moving average is reported. The window width is adjustable but is typically 5 m. This measure is designed to detect small occurrences of less common (and perhaps economically important) minerals.
NOTE: There is currently a problem for display on mobile devices with the Google Maps App installed. In this case, although the maps display properly, the links in the sidebar that come up when a hole is selected are no longer active. I’m still looking for a solution to this problem.