Hi,
I have no real idea of what you are doing but I think you will need filters to
go from a total magnetic intensity image to a 1VD image. Try to figure
out what these filters are and then Google the filter type with QGIS, Saga or
Grass. Chances are that Saga or Grass have what you need and then you can
access them using the qgis processing toolbox plugin. I wonder if the
QGIS semi-automatic classification plugin has that? Once you have the 1VD
image, the hillshade will likely help you enhance the anomalies.
Limited help but better than nothing...
Cheers!
Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc. 
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112  Fax: 514.381.4995
www.archeotec.ca
On Feb 2, 2016 9:27 PM, "Grant Boxer [via OSGeo.org]"
<ml-node+s1560n5248592...@n6.nabble.com> wrote:
I have a total magnetic intensity image and would like to create a
first vertical derivative of the image. I have found the hillshade, slope and
aspect operations and wondered what is the best to use as 1VD process? Grant
Boxer Consultant Geologist (FAIG R.P. Geo) Perth, Western Australia
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