[Bug-gama] GaMa error report

[falu]

Hi!

 

I tryed your GaMa software and i founded an error, but maybe I'm stupid and I don't think so...

I've created a simple project with 3 known and 1 unknown points. From the unknown point I have observations to all known, and a distance to a known point.

Here is the test.gkf file:

 

<?xml version="1.0" ?>

<!DOCTYPE gama-xml SYSTEM "gama-xml.dtd">

<gama-xml version="2.0">

<network>

<description>

hatrametszes

</description>

<parameters

/>

<points-observations distance-stdev="5.0" direction-stdev="10.0">

<point id= "1" y="20.00" x="130.00" xy="fixed" />

<point id= "2" y="140.00" x="120.00" xy="fixed" />

<point id= "3" y="90.00" x="20.00" xy="fixed" />

<point id= "HATRA" xy="free" />

<obs from="HATRA">

 <direction to= "1" val= "59.9072" />

 <direction to= "2" val= "179.1986" />

 <direction to= "3" val= "300.1625" />

 <distance to= "2" val= "58.3100" />

</obs>

</points-observations>

</network>

</gama-xml>

 

 

 

 

After the running of GaMa created the following report file:

 

 

Adjustment of local geodetic network        version: 1.6.00-svd / win32-borland

************************************

http://www.gnu.org/software/gama/

 

 

Approximate coordinates

***********************

 

coordinates          xyz        xy         z

 

given       :          0         3         0

computed    :          0         1         0

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

total       :          0         4         0

 

observations:          4

 

 

Outlying absolute terms in project equations

********************************************

 

   i   standpoint       target           observed     absolute

=========================================== value ===== term ==

 

   4        HATRA            2 dist.     58.31000        -16433

 

 

Observations with outlying absolute terms removed

 

 

Network description

*******************

 

hatrametszes

**** you are using obsolete XML attribute fixed

**** you are using obsolete XML tags

**** you are using obsolete XML attribute fixed

**** you are using obsolete XML tags

**** you are using obsolete XML attribute fixed

**** you are using obsolete XML tags

 

 

General parameters of the adjustment

************************************

 

Coordinates           xyz     xy       z

 

Adjusted       :       0       1       0

Constrained  * :       0       0       0

Fixed          :       0       3       0

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

Total          :       0       4       0

 

Number of directions       :     3            Number of bearings:     1

 

Number of project equations:     3            Number of unknowns:     3

Degrees of freedom         :     0            Network defect    :     0

 

m0  apriori    :    10.00

m0' aposteriori:     0.00         [pvv] : 1.50378e-50

 

During statistical analysis we work

 

- with aposteriori standard deviation 0.00

- with confidence level 95 %

 

 

 

Fixed points

************

 

       point         x              y  

========================================

 

           1      130.000         20.000

           2      120.000        140.000

           3       20.000         90.000

 

 

Adjusted coordinates

********************

 

  i        point    approximate  correction  adjusted    std.dev conf.i.

====================== value ====== [m] ====== value ========== [mm] ===

 

           HATRA

  2            x        80.89710   0.00000      80.89710     0.0     0.0

  3            y        76.30164  -0.00000      76.30164     0.0     0.0

 

 

Adjusted orientation unknowns

*****************************

 

  i   standpoint   approximate  correction  adjusted   std.dev conf.i.

==================== value [g] ==== [g] === value [g] ======= [cc] ===

 

  1        HATRA    285.751659   0.000000  285.751659      0.0     0.0

 

 

Mean errors and parameters of error ellipses

********************************************

 

       point     mp      mxy      mean error ellipse  conf.err. ellipse   g

=============== [mm] == [mm] ==== a [mm] b  alpha[g] ==== a' [mm] b' ========

 

       HATRA     0.0     0.0     0.0     0.0   175.7

 

 

Adjusted observations

*********************

 

   i   standpoint       target           observed     adjusted std.dev conf.i.

=========================================== value ==== [m|g] ====== [mm|cc] ==

 

   1        HATRA            1 dir.     59.907200    59.907200     0.0     0.0

   2                         2 dir.    179.198600   179.198600     0.0     0.0

   3                         3 dir.    300.162500   300.162500     0.0     0.0

 

 

 

The GaMa calculated for the point HATRA the following coordintates: x=80.89710 y=76.30164, I think this is wrong result, the good result will be x=90.00 y=90.00 

 

I’ve tried some versions of GaMa: 1.5.09 (Rocinante) , 1.6.00, 1.7.08 and the results never changed.

 

Where is the error/bug?

 

 

Thanx: Zoltan Faludi (Hungarian surveryor)