Manipulating
the Aeromagnetic data from the Former Soviet Union
I.
Trick Geovu into giving up data
The
first step is to trick NGDC’s Geovu into giving up data from the
FSU Mag CD/Data/NGDC_GRD/ Grid subdirectories. I have not bothered to
figure out how to get data from the other subdirectories but it is probably
a similar process:
Start
Geovu – get the most recent version from www.ngdc.noaa.gov
(search for Geovu). Getting the most recent version is important;
an earlier version always crashed when I tried to get data off the CD.
to get
data or an image
Click:
File/Set Data Source on the menu bar - click on file you
wish to extract (it has to have .bin file extension). Geovu might
open the data set - you hope it does. And it tells you "searches
created = None" This might surprise you because you think you
want an image or to export data. Yet, you are on the right track;
Geovu thinks of getting data or images as a search.
Click:
Search/Create
Geovu pops the
"Image Search parameters" screen - you can set the grid
limits by hitting the "Set search parameter Limits" command
button and changing the limits.
To get
an image on the screen: In the popup window: Select
Image or Map Display. You get the image and can do some manipulation
of that image
To get
data: In the popup window: Select "Write to
disk file":
In the select
option boxes select:
II. Use SURFER
to plot the data
III.
Use PFDRIVER
to change to USGS grid format
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