Download

List of Stations to Download

This displays a list of the stations that have been selected for download. The list is empty until you add to it using the Add from List or Add Closest tabs.

Settings

The Path to send files to field specifies where to save the downloaded files. The Date and Time Range parameters indicate the date and time range (GMT) of the data to be downloaded. If using the GPB search mode option on the Add Closest tab, all of the parameters under Settings are scanned automatically.

Selecting Leave ‘as is’ will preserve the original sampling data rate of the downloaded data. Common sampling rates provided by GNSS networks are 1, 5, 10, 15 and 30 seconds. Some networks, such as CORS, only make high rate available for a limited period of time (such as 30 days) prior to archiving the data at a 30 second sampling rate. Therefore it is good practice to retrieve base station data within days of your survey when possible.

In differential processing, only common epochs can be processed between master and remote. Thus, if you require processed output at the same logging interval as the remote, base station data needs to be re-sampled to the same interval should it be collected at a lower rate.

Resampling measurements introduces noise, and the magnitude of the added noise is dependent on the original sampling rate of the data. Waypoint has found that the amount of noise introduced when resampling from an original rate of 5/10/15 seconds is negligible. When resampling from 30 seconds however, 1-2 cm of noise (RMS) can be introduced, although that is typically within the noise of a kinematic survey.