# Release notes for OVT version 2.1

April 12, 2002

This release of OVT is the first one from 2.0 in April, 2001. There are many new features and bug-fixes.

### New features

#### Data visualization module

gives possibility to visualize simple data on orbit and/or fieldlines. It includes following modules:

- Load Data Wizard, which can load data from 2-column data file containing time and value;
- Data scalar bar;
- Data on orbit module;
- Data on fieldlines Module;
- Data Properties window.

#### View Controls

- View Control Window include Perspective/Parallel projection choice;
- Look at menu item in Earth, Satellite and GroundbasedStation pop-up menu;
- View Control Toolbar contains fast views buttons: close view to the northern/southern hemisphere, views from x, -x, y, -y, z, -z and a button to show a View Control window.

#### Orbit files (TLE) validation tool

`checktle` - allow user to create "correct" TLE files by cleaning double and incorrect ordered lines. It is strongly recommended to process TLE files with `checktle` when importing. `checktle` is located in `ovt2g/bin` directory and is used from the command line `checktle filein.tle fileout.tle`.

#### Shape of Cluster satellites

is now cylindrical with additional small cone, indicating spin axis orientation.

#### Magnetosphere

visualization is now possible with "thick" fieldlines in addition to wireframe. Thickness of the fieldlines can be specified.

#### Footprints

now have time labels.

#### Earth

visualization now includes

- meridians and parallels (grid) with labels;
- different texture choice (Black & White, Normal and High Resolution).

#### Orbit monitor

dumper now has option to include B-total, Bx, By, Bz, Footprint coordinates, Dipole Tilt angle.

### Updates and fixes

#### Field line calculation

works approximately 2x times faster due to some optimizations included.

#### Orbital files

- Cluster LTOF files are updated to 25-Jan-2002;
- Updated orbital files for other satellites are included in the distribution and also can be found at our download page

#### Caption

- is wiser. Example: (2001-01-01 00:00:00 - 2001-01-02 00:00:00) is changed to (2001-01-01 00:00:00 - 02 00:00:00);
- is always updated on change of time period.

#### Major bugs fixed

- MLT display in Orbit monitor;
- Cluster orbit calculation;
- java.lang.ArrayIndexOutOfBoundsException;
- "slow" ground based stations;
- window behavior on resize.

### Known problems

#### Windows 2000

has OpenGL/Java memory leaks resulting in numerous problems starting from incorrect color display and ending by program crash in case of earth grid display or close look at Cluster satellites.

#### Using parallel projection

may sometimes leed to strange effects like mirroring of labels, clipping of view-plane, etc. Pressing `reset` in View Control Window may sometimes help.

OVT2 is known to run on majority of Windows and UNIX platforms.

Submission of bugs and possible improvements is welcome. Please send e-mail to ovt-team@nest.irfu.se

Copyright © 2000-2002, OVT Team. All rights reserved.
Maintained by Yuri Khotyaintsev (yuri@irfu.se)
http://
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