GM-SYS 4.10 Release Notes
GM-SYS Profile Modeling Aug 13, 2006
New in GM-SYS
SEG-Y Reader
The SEG-Y Reader application, available only with GM-SYS
Advanced Profile Modeling, converts 2D and 3D SEG-Y standard files
to formats that may be used in GM-SYS, GMSYS-3D, and Oasis montaj.
SEG-Y Reader may be run as a stand-alone application, or may be
called from within GM-SYS Profile when loading a SEG-Y file as a
Backdrop. It may also be started from within Oasis montaj, but
there is no linkage between the applications. Writing a Geosoft
file (grid, database, or geosoft_voxel) requires an Oasis montaj
license.
A 2D SEG-Y file can be converted to a Windows Bitmap (BMP)
suitable for importing into GM-SYS Profile, an oriented Geosoft
Grid (GRD) that may be displayed in a 3D View (GMSYS-3D or other),
or a Geosoft Database (GDB). Configuration options allow the file
to be projected onto any vertical plane (e.g. a GM-SYS Profile
model), to be windowed or decimated in the X (distance) and/or Z
(time or depth) directions, and the vertical scale and units to be
modified. Trace coordinates from trace headers may be used, or they
may be imported from a separate navigation file.
A 3D SEG-Y file can be converted to a Geosoft Database or a 3D
Geosoft grid (geosoft_voxel), which may be incorporated into a
GMSYS-3D model, displayed in 3D Views, or exported to another 3D
format (e.g. GOCAD). Currently, the voxel size information
(orientation, sample spacing, and rotation) must be entered by
hand.
Horizontal Magnetic Gradient (Btx) Calculations
GM-SYS Advanced Profile modeling now calculates the horizontal
(Btx) magnetic gradient. GXs have been rewritten to allow this
gradient data to be included in new models created from within
Oasis montaj, whether from a database or a series of grids. You may
also import horizontal magnetic gradient data into an existing
model.
Improved horizon import from Oasis montaj
The maximum number of horizons incorporated into a new model
from Oasis montaj has been increased to 15. When extracting a model
from grid profiles, specify up to 15 horizon grids, or specify up
to 15 horizon channels from a Geosoft database. A new option in
each dialog allows you to specify whether the horizon information
is depth (i.e. positive down) or elevation (i.e. positive up) for
the selected grids or channels; all must be the same
orientation.
Use either old Raster or new Vector Patterns.
For backward compatibility, you may elect to use to the old
raster patterns when displaying or printing your model. While the
new vector patterns are intended to mimic the original raster
patterns as closely as possible, they are not exactly the same. For
purposes of exact reproduction, use the raster patterns.
Select the Use old raster patterns in model view check-box in
the Preferences (File | Preferences | Miscellaneous) to enable the
old style patterns. Using raster patterns may obscure Bitmap
Backdrop images, since the raster patterns cannot be made
transparent.
Simplify Surfaces
Oversampled surfaces force GM-SYS to perform unnecessary
calculations and make editing a model more cumbersome. This
commonly occurs when models or surfaces are extracted from grids or
imported from seismic processing or other applications. The
Simplify function allows you to remove redundant points from an
existing surface. Select Examine (the eyeball on the toolbar) and
click on the surface between points (you may have to zoom in). The
surface spreadsheet will be displayed. You can scroll down to the
bottom of the spreadsheet to see how many points are in the
surface. Click on [Simplify], enter a "Straightening Tolerance" and
click OK. You can check the # of points in the spreadsheet to see
how many it removed before you save it. If too few points were
removed, click on simplify again and adjust the straightening
tolerance. If too many points are removed, select [Cancel] and
select the surface again. When you are ready to save the decimated
surface back in the model, just click on OK. This step may be slow
on big models.
You can also Simplify a surface when you are importing it as a
file using the [ImpSurf] function. A new Straightening tolerance
field has been added to the import dialog. If you leave it set at
0, it has no effect; otherwise it will decimate the file as it
brings it in. If you don't approve of the changes, click [Clear]
and Load the file again.
Axis Scaling in CVTGMS
Occasionally, a model may be built using the wrong axis units. A
new Scale Axes feature in CVTGMS allows the X and/or Z axes to be
scaled independently by any factor.
Bug Fixes:
In addition there are a number of improvements to existing
features:
GM-SYS uses geosoft.key to locate license manager. Fixed memory
corruption of Oasis montaj when drawing Plan View to Map. Cursor
"jumped" when entering paper dimensions in Print dialog. Improved
the color/pattern selection tool in the Examine Block dialog. LCT
2-Mod import didnt handle residual gravity field. Fix hang when
zooming in the anomaly window(s). IHF output had wrong units flag
for X coordinate. Fixed spike in magnetic and gradient calculations
when station located directly over a vertical
boundary.
Removed quotes when copying from GM-SYS spreadsheets to external
files (e.g. Oasis montaj databases).
Fixed backdrop registration problem.
