[Users] Importing coastline into OpendTect workspace

[Arnaud Huck]

Dear OpendTect users,

First of all thank you for the numerous download after the 4.0 release
(more than 1300 in the first week).

One of the new functions in OpendTect 4.0 enables you to display
annotation data at the top or bottom of the OpendTect scenes. These can
be maps, coastlines, ... This option is available in the right-click
menu of the scene element in the tree
(http://opendtect.org/rel4/doc/User/base/chapter4_trees-and-pop-up-menus.htm#LINK-TREE.SCENE.PROPERTIES).
>From this menu you will be able to add two pictures respectively at the
top and bottom of the survey and optionally give them transparency
properties. The default coordinates proposed are the survey boundaries,
which is fine most of the time. The picture will be stretched to fit the
desired frame. For orientated surveys the top left and bottom right
coordinates are used, and the picture remains aligned to the inlines and
crosslines.

Nevertheless the most complicated part is to get a picture whose
boundaries are the survey boundaries, featuring useful items like
coastlines, well positions, ... There are two main ways to do this:

1. Generic Mapping Tool (GMT): The GMT software linked to OpendTect can
create postscript files featuring survey basemap, horizons and grids,
wells, coastlines, 2D survey geometry... Once such a file has been
created it must be displayed on screen and you need to make a screenshot
restricted to the basemap only.

2. Export of survey settings to google earth: The google export tool
(http://opendtect.org/rel4/doc/User/base/chapter5_menu-survey.htm#LINK-FILE.SURVEY.SELECTION)
can create a kml file that can be opened in google earth. It will show
the survey area as a polygon. Once again you need to make a screenshot
restriced to the polygon only, and since google earth is a 3D package
the view must be at the vertical of the survey area (even though they
might be small perspective remaining).

When applying both you can receive something like in the attached
picture, with the GMT basemap on top (partially transparent) and the
google earth basemap at the bottom of the survey.

Please note that not all new functions are brand new functionalities.
Quite a lot improve small steps the overall experience and will be
presented in the incoming weeks using such emails, new tutorials or
presentations. Please fell free to ask how a specific (even simple)
workflow can be done.

Best regards,
Arnaud Huck.

-- dGB Earth Sciences
-- Nijverheidstraat 11-2, 7511 JM Enschede, The Netherlands
-- mailto: arnaud.huck at dgbes.com, http://www.dgbes.com
-- Tel: +31 53 4315155 , Fax: +31 53 4315104

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