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[Bug-gama] Error with simple triangle adjustment.


From: Oleg.Goussev
Subject: [Bug-gama] Error with simple triangle adjustment.
Date: Tue, 24 Apr 2018 10:02:27 +0000

Dear Aleš,

 i have modified the standard .gkf example to include two fixed points (1 and 
2) and one free point (407) 
 to be adjusted using measured distances (1->407 and 2->407)
===
<point id=  "1" y=" 644498.590 "  x=" 1054980.484 " fix="xy" />
<point id=  "2" y=" 643654.101 "  x=" 1054933.801 " fix="xy" />
<point id="407" y="644025.978" x="1054821.167" adj="xy" />
<obs from="1">
   <distance to="407" val= "498.750" />
</obs>
<obs from="2">
   <distance to="407" val= "388.562" />
</obs>
===

This example works as expected, but if if remove the (optional ?) approximate 
coordinates for point id="407"
===
<point id=  "1" y=" 644498.590 "  x=" 1054980.484 " fix="xy" />
<point id=  "2" y=" 643654.101 "  x=" 1054933.801 " fix="xy" />
<point id="407" adj="xy" />
<obs from="1">
   <distance to="407" val= "498.750" />
</obs>
<obs from="2">
   <distance to="407" val= "388.562" />
</obs>
===

then gama-local fails with the "No network points defined" error:

===
<error category="gamaLocalException">
<description>GNU Gama - solution ended with error!</description>
<description>No network points defined</description>
</error>
===

Is it a bug in the program, or do i misunderstand something ?

Sincerely,
 Oleg.

----------------------------------------------------------------------------

Dr. Oleg Goussev

Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
Erdbeobachtungszentrum (EOC)
Deutsches Fernerkundungsdatenzentrum (DFD)

Oberpfaffenhofen
82234 Weßling

Tel.: +49 (8153) 28 3295
Fax: +49 (8153) 28 1363

email: address@hidden
Internet:http://www.dlr.de/eoc



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