Content Comparison

{section}
{column:width=70%}

h2. Introduction

The tracking data is the foundation of all further GIM processing, including:
* GIM seismic
* Surfaces
* 3D bodies
* Facies attributes on surfaces

Note that the tracking settings are often very different for the different options mentioned above, and it is therefore essential to be aware of how to set the GIM tracking parameters to obtain optimal results.
{column}
{column:width=30%}
\\
\\
*On this page:*
{toc}
{column}
{section}

h2. Tracking generation interface
The tracking generation interface in opened up from *Tools* -> *GIM Data Generation* -> *GIM Tracking*. The interface has 4 different menus and works as a wizard with *next* and *back* buttons. The 4 menus are:
# Input
{indent}This is where you decide which dataset to track, and which interval to use between inlines and crossline. The settings can also be adjusted so that only a subset of the cube is tracked.
{indent}
# Tracking parameters
{indent}
{indent}
# Output
{indent}
{indent}
# Status
{indent}
{indent}

||
!att:_img_menu^GIM_tracking.png|width=800!
_The tracking menu_
||
h2. Tracking parameters


*Parameters for surfaces*
Generating surfaces is very much a balancing act. One wants the tracker to be generous and generate long lines giving us large surfaces. But at the same time we do not want the tracker to make mistakes. So we have to test to find the optimal settings.

*Parameters for 3D bodies*
To make 3D bodies, we want to omit the data which is interpretable. We invert the tracking so that all good data is removed, and we are left with the noisy bits of which we will make bodies. Often we use a medium tracking criteria (dT of 6ms) combined with a medium remove long setting (e.g. 6 traces).

*Parameters for facies attribute*
To make facies attribute, we only generate the tracking in one direction, either inline or crossline. One recommended method to get exiting results is to combine a strict tracking criteria, e.g. a dT of 3 ms, combined with a "remove short" set to 10 traces. This will make lots of breaks in the tracking as well as remove all parts of the data where GIM cannot generate interpretation lower than 10 traces.

h2. Testing tracking parameters

Wether the objective of the GIM tracking is to generate GIM seismic or GIM tracking to create GIM surfaces, it is essential to first set the tracking parameters optimally. Since the tracking process only takes a few seconds on any given inline/xline, or 2D section, it is possible to effectively test the tracker interactively until the desired result is obtained. To test the tracker parameters, make sure a seismic section is displayed in the Geocap graphical window, and then click Tools->GIM Data Generation->GIM Tracking.

h2. Tracking the cube