This document lists all of the external types available in SOD. Each external type has a corresponding Java interface that must be implemented as part of its use. You can also see a simple implementation of each interface linked from each type. The simple implementations don't actually do any work, but they show the general structure an external of that type will need to take. Finally, each type has a link to its entry in the ingredient listing. This shows where you need to insert the external into your recipe.
To decide which external is right for your goals, go through the types listed here from the top. They're grouped by arm and then in their order inside of the arm. This means that they're also listed in the order that SOD applies them, so using one earlier in the list will allow SOD to do less work to get to it which means if it's rejecting things it'll save work overall and if not, at least it'll get to its job earlier.
Each type has a short description of the data available at that point in SOD's processing structure. If it includes the data you need to do you work, then implement that external.
Each successive item here has the information from the previous step. A station knows about its network and a channel about its station and so forth.
- All of the information in the network arm is available here. The channel provides its effective time, code, orientation, nominal sampling and has all of the information from its site, station, and network.
The waveform arm operates on the combination of the items coming out of the event and network arms. Therefore each item here has an event and a piece of network information. As with the network arm each succesive item has all of the information from its previous steps.
The waveform vector arm takes the place of the waveform arm and still operates on the combination of the items coming out of the event and network arms. However instead of operating on a single channel at a time, it operates on a vector of channels. Therefore if you want to check on some property between the channels in the vector, this would be the place to look.