33. On the UFCORS Page I do not know which day to select. How do I choose the day and time ?

Select the day on which you collected your data. The Starting Day field shows the days in standard calendar format, month-day-year, and in GPS day of year format. The starting time should be the hour you began you observations. You may choose the previous hour to get complete coverage. You can select the starting time in the local time zone for convenience or in UTC if that is more appropriate. You must, however, indicate which time zone you are referencing. Refer to CORS FAQ 25 for a detailed explanation of time zones. The number of hours of data you request should cover your entire observing session. Requesting a hour beyond the end of you observing session is prudent and will not slow the retrieval significantly.

As an example, if you are in Eastern Standard Time Zone and your observations began at 9:10AM and ended at 1:15PM. You should select the time zone of EST, a starting time of 09:00, and a duration of five (5) hours. This will give you enough CORS data to correctly process your data.

42. I requested data and did not get it. Or, I requested data and got a strange text file instead. Why?

There are three possible causes for not getting data or not getting all the data requested:

1. You have requested data for a site that is not part of the National CORS. This only happens when you do not go through the UFCORS Web page. Some GPS manufacturer software connects to the UFCORS web page directly to request data automatically for the user. In this case filters for the day, time, and site are bypassed. When the UFCORS application tries to fill the request it fails and no data are returned. In these situations you will receive a file with the name NOT_A_NATIONAL_CORS.txt that will explain what has happened.

2. You have requested data for a site that is part of National CORS but for a day and time when NGS does not have data. Again, this should only happen if you use third party software to request the data and do not go through the filters of the UFCORS Web page. When the UFCORS application tries to fill the request it fails and no data are returned. In these situations you will receive a file with the name NO_DATA_AVAILABLE.txt that will explain what has happened.

3. You have requested data for a site that is part of the National CORS but the data have not yet been collected. This occurs when the request is for data on the current day and the selected number of runs past the the current time. NGS collect data hourly or in real-time from most sites. The files do not become available until some time after the hour. That delay can be up to twenty minutes. When the UFCORS application tries to fill the request it succeeds but not all of the requested data can be returned. In these situations you will receive a file with the name SOME_DATA_MISSING.txt that will explain what has happened.