<p dir="ltr">Hi,</p>
<p dir="ltr">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. </p>
<p dir="ltr">Limited help but better than nothing...<br>
Cheers!</p>
<p dir="ltr">Nicolas Cadieux M.Sc.<br>
Les Entreprises Archéotec inc. <br>
8548, rue Saint-Denis Montréal H2P 2H2<br>
Téléphone: 514.381.5112 Fax: 514.381.4995<br>
www.archeotec.ca</p>
<div class="gmail_quote">On Feb 2, 2016 9:27 PM, "Grant Boxer [via OSGeo.org]" <<a href="/user/SendEmail.jtp?type=node&node=5248594&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>> wrote:<br type='attribution'><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><p>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?</p><p> </p><p>Grant Boxer</p><p>Consultant Geologist (<i><span style="font-size:9pt">FAIG R.P. Geo</span></i>)</p><p>Perth, Western Australia</p><p> </p></div><br />_______________________________________________
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