NGS GPS Calendar
My go-to GPS calendar is (well, has been) the one hosted by NGS. But it didn’t get updated to 2019, so I need to find another. Any recommendations?
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Can you just increment each of the days and continue the GPS week starting from Dec into Jan and then sequentially? ( not being cheeky)
Can you just increment each of the days and continue the GPS week starting from Dec into Jan and then sequentially? ( not being cheeky)
I *could* roll my own calendar, but with so many out there I’d rather let someone else do the work. I was just wondering what other folks use.
Here are a few that I’ve found:
I have been using
and create a customized calendar with month, date and day number of the year.
I just got email from Bill Stone at NGS, who notified me that the calendar update apparently got overlooked but has now been accomplished. Many thanks to NGS for getting the job done!
FWIW,
The NGS also provides some nice source code (in C) dealing with times and dates in GPS. See: https://www.ngs.noaa.gov/gps-toolbox/bwr-02.htm Also FORTRAN 77. A little more involved than merely incrementing.
Code was written by Dr. Benjamin W. Remondi. Took a course under him in the early 90??s. He was an excellent and inspiring instructor. I note this code is much easier to follow as ??in the day? code had to be terse in order to run on slow processors with limited memory.
Lots of other GPS-related code available here: https://www.ngs.noaa.gov/gps-toolbox/exist.htm
Being that I was barely dipping my toes into GPS stuff at the end of my surveying career, I never had the opportunity to deal with this kind of stuff. So I’m not very familiar with it. However, this thread has me thinking — is this something that is delivered via some kind of feed or regularly updated website somewhere? Would this be a useful feature to have here at RPLS Today? If so, I’d be interested in discussing how to gather the data and present it properly if it’s something I could automate.
Thoughts?
Your friendly, virtual neighborhood Webmaster
Educate me. Why do you need day of year?
My receiver automatically puts DOY in the filename, and I increment GPS week on a paper calendar in order to be able to override the erroneous date from the old receiver when converting to RINEX.
.As to Bill93??s question:
After asking the question why one needs the day of year, you follow with the reason. Many GPS receivers label their files with the DOY. I prefer the 8.3 file name convention: four-character station ID, three-digit DOY, one digit session ID, then two-digit year and finally file type (O,N,M, etc). More verbose file names are harder to keep track and require renaming for my use and archiving.
If asked for data from 13 February, I would have to convert that to DOY to find the files. Easy enough to calculate this early in the year, but what about 13 September? Writing or using a program for this task is straightforward. Some even find it fun.
Sites like the NGS UFCORS (??User Friendly CORS?) were developed to facility data retrieval by doing the conversions itself. Not every data source is as accommodating.
My receiver automatically puts DOY in the filename
My Javad receivers use a combination of point number and time-of-day to determine the file name. I use the calendar to determine the day-of-year so that I download the right CORS observation files and precise orbit files.
My receiver also put the day of the year in the file name.
Knowing the day of the year in the office lets me quickly look for the files to grab and transfer into my GNSS software.
Amending what I wrote above, for the precise orbit files I need the GPS week number and the day of the week. The calendar provides both.
I believe the NGS crew was on extended holiday at the 1st of the year and I suppose got overlooked, I was going to contact them, BUT it looks like Jim got it taken care of.
SHG
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