Understanding DC IP/resistivity surveys
Review of the field data sets provided by
six commercial IP/resistivity array setups.
A slide show explains the importance of
acquiring a True 3D field data set
a one-image preview.
© 1976-2015 Premier Geophysics Inc. ver 24Aug2015 E-SCAN is a registered trademark of
Premier Geophysics Inc. used under licence by Crone Geophysics & Exploration Ltd.
The text may identify issues that are thought
to be important for maintaining a practical working perspective vis-a-vis the subject being discussed.
Example: Securing uninterrupted true 3D data set across the vertical cliff area in this project resulted in no additional costs to the client.
Additional time requirements: zero.
Additional risk to client: zero.
Special planning/equipment: none.
example comment: You might think that you can simply double the size of the measurement dipole
to get twice the vertical penetration (before the signal level again becomes unmanageable),- but the
lateral setup distance needed by this doubled-everywhere array may far exceed the available space.
This bigger array may encounter a steep-terrain boundary limitation, or your survey may have to go past
the legal boundary of your property, perhaps requiring you to negotiate the rights to do so.
See the main page item on Rough Terrain.
Secondary concern: a doubled dipole length also diminishes lateral resolution...
Do you have the lateral space required for very long surface array layouts?.
If you use Adobe Reader Version 9 or better (free from Adobe), you may be able to rotate some 3D PDF views, -
provided your computer's video chipset is new and powerful enough.
A low performance chipset may advance rotation in a jerky manner with lots
of wireframe artefacts between images, or it may not work at all.
Most PDF files you might download will not be 3D images,- just high-resolution sheets that you can review, print out, save or send.
This is a real 3D E-SCAN discovery case history...
see details by clicking on GOLD in the home page
menu, then select CASE EXAMPLE #4.
Typically, complete sets of 3D views of results are
available within 2-3 weeks, by e-mail, for review.
The fully formatted, bound report takes longer.
In an emergency, we can get you 3D images within 72 hours of
field data acquisition.
In cases of dense bush, some simple pre-cut lines may
be needed to support crew access to electrode stations.
Most would be pretty minimal cuts,- just enough to slip
through. These access cuts need not be straight lines