DPOS processing report questions

J

jcorax

Member
A couple of questions about the current DPOS reports.

1) First my reports are now adding a 'B' to the lat/long information (see attached pdf). I am guessing that this is some kind of error, or does it have any meaning? This is new this season, I have not seen it before.

2) I suspect that this is some assumed knowledge that I am missing, if so I greatly appreciate anyone who can fill me in. I am unclear on how to know what ellipsoid is being used in reporting height. The report does not specify. How do I find that information? Since GRS80 is the recommended ellipsoid for ITRF2014 I am guessing this is what is being reported? However what ellipsoid is reported for NAD88 (the same?)? How would I know this if it is not documented on the DPOS report and since DPOS has no other documentation? Are there other documented sources it is drawing from?

I have come across mention of a CORS coordinate catalog here in the forums that DPOS potentially follows. I find the below webpage which describes the coordinate systems used by CORS but does not describe ellipsoids or geoid selections. Is there another location/document I am missing that would be relevant to this question?

3) If any DPOS documentation/manual exists I would greatly appreciate knowing about it.

Thanks!
 

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Alexey Razumovsky

Alexey Razumovsky

Well-Known Member
JAVAD GNSS
5PLS
jcorax said:
A couple of questions about the current DPOS reports.

1) First my reports are now adding a 'B' to the lat/long information (see attached pdf). I am guessing that this is some kind of error, or does it have any meaning? This is new this season, I have not seen it before.

2) I suspect that this is some assumed knowledge that I am missing, if so I greatly appreciate anyone who can fill me in. I am unclear on how to know what ellipsoid is being used in reporting height. The report does not specify. How do I find that information? Since GRS80 is the recommended ellipsoid for ITRF2014 I am guessing this is what is being reported? However what ellipsoid is reported for NAD88 (the same?)? How would I know this if it is not documented on the DPOS report and since DPOS has no other documentation? Are there other documented sources it is drawing from?

I have come across mention of a CORS coordinate catalog here in the forums that DPOS potentially follows. I find the below webpage which describes the coordinate systems used by CORS but does not describe ellipsoids or geoid selections. Is there another location/document I am missing that would be relevant to this question?

3) If any DPOS documentation/manual exists I would greatly appreciate knowing about it.

Thanks!
Click to expand...
A1. Correct.
A2. CS ITRF 2014 uses ellipsoid WGS-84 for HTDP, NAD83 uses GRS80.
A3. DPOS report is similar to OPUS one. No documentation.
 
J

jcorax

Member
Thanks very much for your reply. Would this be the same on the dev DPOS site which is still reporting in IGS08? That is CS IGS08 uses WGS84 ellipsoid and CS NAD83 uses GR80?
 
J

jcorax

Member
I very much appreciate having the information as to which ellipsoid is being used. If I had not gotten that information from you here how else would I have known which ellipsoids were being presented in the report? If you make future updates/changes to DPOS (as you have done recently) how will I find this information?
 
Alexey Razumovsky

Alexey Razumovsky

Well-Known Member
JAVAD GNSS
5PLS
jcorax said:
I very much appreciate having the information as to which ellipsoid is being used. If I had not gotten that information from you here how else would I have known which ellipsoids were being presented in the report? If you make future updates/changes to DPOS (as you have done recently) how will I find this information?
Click to expand...
You can get any information about DPOS report on support.javad.com from any person from DPOS group
 
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