Description
The metadatachange service returns information related to historical changes that have been made to SEED metadata. Results are returned in XML only. Metadata changes can be searched by SEED channel constraint parameters, time of metadata change, or type of metadata change
Overview
The metadata tracking system monitors metadata from the DMC’s fdsnws-station service, tracks significant changes and stores them in a database. Only identified classes and specific details of metadata are tracked (see below), other, generally inconsequential details are not recorded.
The tracking system checks for updates to metadata once per hour.
Metadata Changes: Class, Detail and Schema Location
The table below describes all metadata changes tracked. A simple, 2-level hierarchy of Class and Detail is used to identify changes and allow for selection based on specific characteristics. At a fundamental level, the tracking system is based on FDSN StationXML as produced by the DMC’s fdsnws-station service. This table further identifies which schema elements correspond to tracked metadata.
| Class | Detail | Schema Location |
|---|---|---|
| Station | Added | N/A |
| Removed | N/A | |
| StartTimeChange | Network:Station | |
| EndTimeChange | Network:Station | |
| Channel | Added | Network:Station:Channel |
| Removed | Network:Station:Channel | |
| StartTimeChange | Network:Station:Channel | |
| EndTimeChange | Network:Station:Channel | |
| StationLocation | Latitude | Network:Station:Latitude |
| Longitude | Network:Station:Longitude | |
| Elevation | Network:Station:Elevation | |
| ChannelLocation | Latitude | Network:Station:Channel:Latitude |
| Longitude | Network:Station:Channel:Longitude | |
| Elevation | Network:Station:Channel:Elevation | |
| Depth | Network:Station:Channel:Depth | |
| ChannelOrientation | Azimuth | Network:Station:Channel:Azimuth |
| Dip | Network:Station:Channel:Dip | |
| ChannelData | SampleRate | Network:Station:Channel:SampleRate |
| ChannelDescription | SensorType | Network:Station:Channel:Sensor:Type |
| ChannelSensitivity | Value | Network:Station:Channel:Response:InstrumentSensitivity:Value |
| Frequency | Network:Station:Channel:Response:InstrumentSensitivity:Frequency | |
| Polynomial | Network:Station:Channel:Response:InstrumentSensitivity:Polynomial | |
| InputUnits | Network:Station:Channel:Response:InstrumentSensitivity:InputUnits:Name | |
| OutputUnits | Network:Station:Channel:Response:InstrumentSensitivity:OutputUnits:Name | |
| ChannelSensor | DigitalResponse | Network:Station:Channel:Response:Stage1 |
| ChannelDigitalResponse | DigitalResponse | Network:Station:Channel:Response:Stage2-N |
Problems with this service?
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We will address your issue as soon as possible.
