[Info-gama] Gama Adjustment with Constrained/Free? with Autonomous GPS points

[Jim Sutherland]

Thanks Ales for your processing suggestion.  >to solve your problem I would probably use the classical 'free >network >adjustment' where all points are defined as 'constrained' (no fixed >points are needed)                       <point  ....  adj="XY" /> I created the input file and used Rocinante to edit and run the adjustment.  I checked off "active xy" in the point edit box and selected constrained for each point.  I looked at the saved file and it looks like it saved the file in the format that you suggest  <point  ....  adj="XY" />.  I must admit I was getting a little confused in using the Rocinante edit GUI.  But, I must say it is excellent and robust - I am just a new user.  You mention that it should probably be run as a classical 'free adjustment' Rocinante seems to select the same format labeled as 'constrained'.   Please see the input file below which has the seeded autonomous coordinates.  Also see a list of the true coordinates preceeding the input.  Thank you again for your comments. True coordinates derived by GPS RTK Observations
1	5368175.111	476682.276	4	5368128.815	476713.854
2	5368155.686	476651.344	5	5368144.984	476686.583
3	5368115.384	476678.766

The Gama input file follows:

<?xml version="1.0" ?>

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

<!-- this file was created by Rocinante 1.0.0 -->

<gama-xml version="2.0">

<network axes-xy = "en" angles="right-handed">

<description>

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

XML input stream of points and observation data for program GaMa

* Five point survey network (Point 2, 3, 4, 5 directions only to 1a)

* Images captured via elevated monopod 5.6 meters above ground level

* Equirectangular panorama images created for each node using PTGui stitching software

* PTGui corrected for FOV, a, b and c lens parameters for each node

* Distances measured with cloth tape

* Uni4 Data

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

 

</description>

 

<parameters

sigma-apr = "10.000"

conf-pr = "0.950"

tol-abs = "1200.000"

sigma-act = "aposteriori"

/>

<points-observations distance-stdev="0.00 0.00 1.00">

<point id="2" x="476648.60000" y="5368157.00000" adj="XY" />

<point id="3" x="476674.80000" y="5368116.70000" adj="XY" />

<point id="4" x="476715.30000" y="5368129.80000" adj="XY" />

<point id="5" x="476685.00000" y="5368148.50000" adj="XY" />

<point id="1a" adj="XY" />

<obs from="2">

<direction to="1a" val="0.000000" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<direction to="5" val="54.733840" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<direction to="4" val="61.767101" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<direction to="3" val="97.954902" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<distance from="2" to="5" val="36.83000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

<distance from="2" to="4" val="68.04000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

<distance from="2" to="3" val="48.75000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

<distance from="2" to="1a" val="41.50000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

</obs>

<obs from="3">

<direction to="2" val="0.000000" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<direction to="1a" val="45.707822" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<direction to="5" val="54.407296" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<direction to="4" val="114.859847" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<distance from="3" to="2" val="48.75000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

<distance from="3" to="5" val="30.62000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

<distance from="3" to="4" val="37.57000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

</obs>

<obs from="4">

<direction to="3" val="0.000000" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<direction to="2" val="49.190961" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<direction to="5" val="57.354567" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<direction to="1a" val="90.703945" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<distance from="4" to="3" val="37.57000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

<distance from="4" to="2" val="68.04000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

<distance from="4" to="5" val="31.70000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

</obs>

<obs from="5">

<direction to="1a" val="0.000000" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<direction to="4" val="134.550237" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<direction to="3" val="216.775847" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<direction to="2" val="319.231301" from_dh="0.00000" to_dh="0.00000" stdev="300.00" />

<distance from="5" to="4" val="31.70000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

<distance from="5" to="3" val="30.62000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

<distance from="5" to="2" val="36.83000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

<distance from="5" to="1a" val="32.95000" from_dh="0.00000" to_dh="0.00000" stdev="50.00" />

</obs>

 

</points-observations>

</network>

</gama-xml>