Disclaimer: This guide only applies to the U.S., some parts of North America, and the Caribbean. Coverage of operational stations might not be available for all areas and it should be consulted using this guide.
- Confirm that a NOAA CORS station is located within a distance of 10km from your mission location and that the status for the station is "Operational"
- Acquire the start and end times of your mission. For DJI RTK drones, those can be calculated based on the first and last timestamps in the MRK files in UTC Time.
- Acquire the latitude and longitude of your site or mission
- Use Mozilla Firefox or Google Chrome browser
Checking Operational CORS Availability
1. Access the U.S. National Oceanic and Atmospheric Administration (NOAA) map from the website below:
2. Enter the latitude and longitude of your mission to locate the nearest CORS station.
Click any operational station within a range of 10 km from your mission location. As a rule of thumb, a distance of 0-10 km will guarantee the best possible accuracy of the ppk solution.
(If there are no stations within that range, we do not recommend using a base log from a further station, the accuracy is expected to worsen as distance increases).
Check the Station ID (p.e. CTA1) and confirm the station status is "Operational" (non - operational stations will not provide updated GNSS logs).
Downloading NOAA Baselogs
3. Enter the station ID in the database from the next NOOA website.
4. Fill in the next settings based on your mission date/time.
- Start Date / Start Time: For DJI RTK drones, this can be calculated based on the timestamps MRK files in UTC Time. You can select UTC as the time zone and choose your start date/time and log duration so that the log starts before your first mission time stamp and ends after your mission's last time stamp.
- Select the sampling rate of 1 second
- Select All available satellite signals
- Check the coordinate file option
5. Click download. If there is an available base log, your download will start. Once done, you can uncompress the downloaded folder, where you will find the following:
- The base log file with format .2xo that you should include in your dataset submission to DataHub.
- The coordinate.txt file where you can consult the base position to enter in DataHub. The pole height value is zero.