What’s Available?
Data availability plots
On this page you can identify what data are currently on the server. As data are uploaded to WALDO these plots automatically update.
To give you a sense of available sites, here is a partial map of some of the sites that are or will be on WALDO. To keep the map from being too busy, we skipped some (for now), and compressed some “clusters” of receivers into one. To get a better idea of what sites are available, find the “Availability Maps” below, which show precisely what sites are available for each day.
- Availability calendars (annual)
- Availability maps (daily)
- Availability charts (monthly)
Availability Calendars
This gallery contains annual calendars for each site, color coded to show what days have broadband and narrowband data. Useful for finding how continuous the data from a specific site is over a long period, or whether a specific site’s data exists on a given day.
The above example is an availability calendar for a site called “PARI” (the Pisgah Astronomical Research Institute, in North Carolina). If any data exists for a given day, a box appears on the calendar. The cell is then divided in half. The bottom half indicates, with a green bar, how much of the day is covered by narrowband data. So if there was narrowband coverage for 12 hours, the bar will go halfway across. The top side of each cell is the same, but it’s red and for broadband data. If there’s a small amount of data, less than 10% coverage, then the bar will go all the way through but it will be gray.
The availability calendars are sorted into folders by site.
Availability maps
This gallery contains a world map of available transmitters and receivers for each day. Useful for finding out what sites are available on a given day. The above example is for July 31, 2016. The available receivers that have at least SOME data are shown with colored dots, green means narrowband data are available, red means broadband data are available, blue means some of both.
If narrowband data are available, the paths to VLF transmitters that are captured are shown with gray lines and gray stars at the transmitter locations. Note that a site is considered to have narrowband data is at least 10% of the day (2.4 hours) are available. The site is considered to have broadband data is at least 1% (0.24 hours) are available.
The availability maps are sorted by year.
Availability Charts
This gallery has monthly charts that show what times were recorded at a given site for narrowband data.
Here’s an example from Briarwood in September, 2016. In this particular month, the data were not recorded on September 1, 2, and 4, and then turned on around 12 UT on September 4th. From then on the recording was pretty continuous apart from a block on the 14th. The small gaps scattered around are brief few-minute outages when the software rebooted. However, the data files for a given day include the entire 24-hour period. Data that are missing are substituted with “NaN”.