Changes between Version 11 and Version 12 of Processing/Applanix


Ignore:
Timestamp:
Sep 19, 2007 2:47:34 PM (12 years ago)
Author:
mggr
Comment:

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  • Processing/Applanix

    v11 v12  
    3434   1. Process differential (button looking like a blue world with a ruler on it).  This brings up a set of options.
    3535     1. Change the ''Process -> Process Information -> Desc'' each run so you can compare between results.
    36      1. Try a run with the default settings first, then investigate other options as needed (see notes below for typical issues)
    37      1. Read the output for hints as to problems
     36     1. Try a run with the default settings first, then investigate other options as needed (see notes below for tips and issues)
     37     1. Read the output for hints as to problems.  You want to see "Fixed" ambiguity and a green (1).
    3838     1. Iterate as often as needed
    3939   1. When processing is complete, the track will be coloured according to the quality of the data.  The important parts should be green!
    40 
     40   1. Click the graph button (or ''Output -> Plot GPS Data'') and review the error estimates.
     41     1. To get time periods for the important parts of the track, left click on points on the track and note the time.
     42     1. To restrict the display on a graph, right click on points to set start/end time or to restrict the Y range.
     43     1. Important statistics (remember these are just estimates and not based on ground truth!):
     44       1. Number of satellites (BAR)- needs to be 5+ for a chance of adequate data quality
     45       1. Combined separation - displays the difference between the forward and reverse solutions for each axis - want the error to be small (<10cm for X & Y, < 30cm for Z) and the separation tiny.
     46       1. (mggr needs to transcribe the rest from notes)
     47   1. When happy you have the best you can, click ''Output -> Export to PosProc''.  Then save and exit POSGPS (goes back to POSPac)
     48   1. Run POSProc.
     49     1. Change the Proc. filename kernel to YYYYJJJ.
     50     1. Make sure "Post-Process GPS" is ticked - if it's not there, you didn't save the POSGPS output correctly!
     51     1.
     52 
    4153
    4254---------------
     
    7991
    8092If the data quality isn't good enough, then you can change some of the settings to effect improvements / admit more data.
     93 * cut out sections of the track if they have significant gaps
     94   * right click on the track and set start/end time in the appropriate places, then reprocess
    8195 * lower the satellite horizon - you might do this to accept more satellite if there are an inadequate number covering an area (minimum 5 for decent quality)
    82  * increase KAR range - up this if your base station is a long way away
     96 * increase KAR range - up this if your base station is further than 30km away
     97 * try different ionosphere models
    8398
    8499-----------