The USFS has a CBS Cors in Pineville...might help my geometry...but it is in the ssf format.
Is this Trimble or what ??
Jimbo
Solution Summary File..
At least that't what it used to be...This is a sub-meter community base station...Not a CORS station...We can't use it for our project.
TM
Got all the files uploaded....Will update the metadat as available..
Hi, James -
SSF stands for standard storage format, it is a Trimble proprietary.
CBS stands for Community Base Station, and in most cases those receivers are Trimble single-frequency mapping receivers, not the dual-frequency survey-grade antennas used in the CORS installations. The carrier-phase data is there, but it takes a couple of extra steps to get it out, steps that you probably will not be able to do without some Trimble software.
Jimbo,
If you have a .SSF file you want to use, I can provide s/w to translate it to RINEX (assuming you also have the ephemeris file). Think of the .SSF as a yellowbox B-file.
Regards,
Brian
For Trimble....
Now it all comes back...It stores the measurements (raw) and sync'd msmt (5 seconds) of carrier phase..
As I recall, this smooths the measurements (not what we want) by a filter constant (0.005)...but it works well for code measurements...
Some of the CBS stations use the Compact Dome External which are worthless for our experiment... Some use the L1 with or without the Groundplane, but I've never heard them used for Single Frequency solutions....The CBS was intended as a code solution file gathering system...
But if Brian says it can work, then maybe they have changed the format...It used to only collect the range measurements (code)....
TM
.dat files.
Suggest you pass on using a meter level base station, even though there is an ssf to rinex converter. GIGO.
And for a final measure, the CBS's are not insured for the type of accuracy that we are working on...
Some of them are on less than stable environments...and none of them (to my awareness) are checked by the NGS...Some have positions that are averaged from code positions...
I think that it might throw a curve in your solutions at the very best and at the worst could possibly case a complete failure..
Code solutions are very reliable to this range that we are talking about, but only to a few feet....Maybe less with all the data we are collecting, but a code position none the less, not a carrier measurement attempt as we are doing...
But...Try it and see what you get....
TM
Was just looking around to see if there are any sites useable other than on NGS CORS page. Now I know what ssf is.
Anybody know how to access the data for a handful of CORS stations that I understand operate on some platforms in the Gulf of Mexico ??? I was told some of these have public access and some are private. They were setup for some sidescan mapping of the Gulf.
I could really use a site to the South to create a "box" around Lake Charles for our ORGI 2 session. Otherwise I get a triangle and I'm sitting of the longside base of it....fair but two of the tangents are gonna be straight line and only one crossing........unless I stretch out to Galveston and that might be a real reach !!!
Jimbo
Modified By James Webb on 2/5/2002 at 9:16 AM
I'm sure you know this, but your NGS Advisor might know of some other base stations useable that are not on NGS's website. I don't know your particular advisor, but the ones I do know are very smart, and quite tapped into the GPS community in their particular area.
Yours is:
Robert Zurfluh
State Land Office, Rm 1201
P.O. Box 44124
Baton Rouge, LA 70804
Telephone: 225-219-0512,
Email: zurfluhr@aol.com
Hadn't thought about asking him. Robert is a pretty good guy and usually has an answer . Very straight up in my few dealings with him.
Thanks,
Jimbo
PS: I'll e-mail this afternoon.
.