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[Paparazzi-devel] Flight plan altitude data.

From: Helge Walle
Subject: [Paparazzi-devel] Flight plan altitude data.
Date: Wed, 16 Jun 2010 23:07:38 +0200

I live at   lat0=60.381221   lon0=5.152867 in Norway. I can not find any SRTM data for the area where I live.
I am working to understand the altitude data in the flight plan, and also the "AGL" value in the GCS. I have searched through the mailing list for explanations; found some, but still I have a way to go.
The following is part of my current flight plan:

<block name="Geo init">
<while cond="LessThan(NavBlockTime(), 10)"/>
<call fun="NavSetGroundReferenceHere()"/>
<call fun="NavSetWaypointHere(WP_HOME)"/>
<set value="ground_alt" var="waypoints[WP_TD].a"/>
<set value="ground_alt+10" var="waypoints[WP_AF].a"/>

Does the statement <while cond="LessThan(NavBlockTime(), 10)"/> specify the time of determining "ground_alt" ?
How is this statement explained ?
How is "AGL" in the GCS computed? Is it the altitude given by the GPS minus "ground_alt" ?
Is "Alt" in the GCS the altitude given by the GPS at any time ?

Thank you for any help,

Best regards,
Helge Walle.

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