Voir la source de Coordinates Systems

[[Image:picto-liste.png|25px]] [[Command|List of commands]]
=Generalities=
===Presentation===
Photogrammetry is often accompagned with a georeferencement (direct or indirect). The geographic position of targets or images is usually given in geographic system such WGS84 or RGF93 (France). To work with this coordinates in MicMac, yo have to transform it in a euclidian system. Best way is to work in a Local frame (RTL) define by the coordinates of one point of the field.
===How to Use?===
Two way to transform coordinates :
* With the tool [[ChgSysCo]].
* With other tools such [[OriConvert]] or [[GCPConvert]] and the option ChSys.
For both case, you have to use the same syntax :
<pre>initial_coordinate_system@final_coordinate_system</pre>
For example, if you want to transform geographic to cartesian, you should use :
<pre>DegreeWGS84@GeoC</pre>
===XML codage===

=Implemented systems=
===Geocentric cartesian===
* Directly on MicMac commands : <b>GeoC</b>.
* In file : <b>eTC_GeoCentr</b>.

===WGS84 geographic===
* Directly on MicMac commands : <b>WGS84</b>, or <b>DegreeWGS84</b>
* In file : <b>eTC_WGS84</b>.

===RTL planes===
For this system, you need to define it on a xml file with this structure :
<pre>
<SystemeCoord>
   <BSC>
       <TypeCoord>eTC_RTL</TypeCoord>
          <AuxR>4320361.093</AuxR> #Center or RTL
          <AuxR>-98032.083</AuxR>
          <AuxR>4675380.773</AuxR>
   </BSC>
   <BSC>
      <TypeCoord>eTC_GeoCentr</TypeCoord> #Coordinate system of the center
   </BSC>
</SystemeCoord>

===Polynomial===