How to open
OLC flight tracks in SeeYou
and view them on a TherMap backdrop
is the most popular software for analyzing and viewing flight
records of glider flights. Having paid a licence fee one can
activate the software downloaded from the Internet. Separate
versions for personal computers as well as mobile devices
SeeYou can open the flight record in IGC as
well as LXN format and then save them in either IGC, MUL,
BMP, OLC or JPG format, thereby working also as a format converter.
However SeeYou does not offer conversions to the KML format
of Google Earth. Users interested to do that are advised to
read the instructions for
analyzing flights with Google Earth.
1. Viewing a flight in SeeYou
Users having installed SeeYou can open an
IGC or LXN flight record file, or after having downloaded
it from OLC,
to view the flight typically as shown in the figure below.
This example contains the track of a flight coming from the
north, before crossing a large valley and then regaining altitude
and continuing across the side valleys further south. Here,
the color of the flight track has been selected to be the
variometer reading. SeeYou actually offers 15 different possibilities
for colouring the flight track, which is a real advantage.
Due to the variometer color coding one can easily see how
the pilot has been regaining altitude after having crossed
the main valley.
SeeYou also permits to view
flights in 3D. In this case one can see not only the actual
flight track, but also the ground trace showing exactly the
locations over which the glider has been flying.
The next figure shows a 3D-view of the same flight. Due to
the added 3rd dimension one can now perceive even better how
the glider has been gaining altitude after crossing the main
valley. However the terrain shown here is what SeeYou offers
as a vector map, a kind of minimum surface representation.
It is therefore relatively difficult to interpret the terrain
SeeYou offers also the use of
more detailed Raster Maps derived from satellite pictures. However,
although the latter show more surface detail, they hardly provide
further insights on thermal processes linked with the landscape.
This is where TherMap can provide further insights.
2. Adding TherMap
backdrops to SeeYou
- Open SeeYou with the flight
you want to analyze and decide on the region,
date and daytime you want to use as a TherMap
backdrop. Note the coordinates of the NW and SE
corner of the backdrop map (you find them under
on the webpage).
- Download this map from the
TherMap site, using the "View/Download
Maps" item in the TherMap menu, and
note the name of the folder where you store
- In SeeYou:
Select >Tools >Rastermaps > Add
and then select and open the map you have
- Complete the file indications
for this map (below the SeeYou table of maps):
- Under "Caption"
add the map name you want to use in See You,
- Declare the "Map Group"
as: "Other maps",
- The field "Licence"
can be left empty,
- Under "Priority"
you shift the slider to "high", and
- Make sure the "map"
and the "group" checkbox are switched
- Click on "Calibrate",
enter the NW and SE corner coordinates of
the map, as noted under point 1, and press "OK"
- Select "Convert"
sure the box indicating that the source file
can be deleted is unticked, unless you are sure
you do not need it again
- Press the "Start"
button to launch the conversion of the JPG file
into a CMR file.
- When the conversion is finished
press "Close" to return.
- The map file list now contains
the converted CMR file.
- Make sure the "map"
and the "group" checkbox are still
switched to "active"
- Press "OK"
to return to the SeeYou main screen
- Activate the TherMap backdrop
- Opening >Tools > Options,
and click on the "Rastermaps"
- (Note: If this box is already
on, switch it off and press "OK" to
return to main screen. Then redo point 8 again,
to make sure this time the new rastermap is
- Then press "OK"
to return to main screen.
- The TherMap overlay should now
immediately appear on the SeeYou screen!
- If not, zoom in or out, to
unblock it, if needed.
- If this does not work, repeat
steps 3 to 9, to make sure you have not skipped
one of the above steps
SeeYou then displays the flight
on the selected TherMap backdrop, as shown on the following figure.
Since TherMap is a color map, the color coded flight track does
not contrast well. The example below nevertheless demonstrates
a high correlation between the thermal potential of TherMap and
the actual variometer readings of the flight track.
In the 3D-view the ground trace
crossing hotspot areas usually shows high variometer
readings, thus illustrating once again the validity of the
By changing the
color coding parameter of the flight track, it is possible to
obtain a better contrast, as illustrated in the following figure
in which the flight track has been color coded by the altitude.