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
Below is a full list of service parameters and their usage.
Query Usage
/query? [channel-options] [time-constraints] [class-parameters] [misc-parameters] [nodata=404]
where
channel-options :: [network=<network>] [station=<station>] [location=<location>] [channel=<channel>] time-constraints :: [startchange=<date>] [endchange=<date>] [starttime=<date>] [endtime=<date>] metadata-types :: [class=<string>] [detail=<string>] [description=<string>] misc-parameters :: [limit=<integer>] [format=<xml>]
Each parameter-value pair should be separated by an ampersand (&) and with no space.
Sample Queries
- /irisws/metadatachange/1/query?network=IU&station=ADK&location=—&channel=BE3
- /irisws/metadatachange/1/query?network=NC&station=N019B
- /irisws/metadatachange/1/query?network=TA&channel=?HE,?HN&class=ChannelOrientation&detail=azimuth
Detailed Descriptions of each Query Parameter
| Parameters | Examples | Specification | Default | Type |
|---|---|---|---|---|
| Channel Options | ||||
| net[work] | IU | Select one or more SEED network codes. | any | string1 |
| sta[tion] | ANMO | Select one or more SEED station codes. | any | string1 |
| loc[ation] | 00 | Select one or more SEED location identifiers. Use -- for “blank” location IDs that contain 2 spaces |
any | string1 |
| cha[nnel] | BHZ | Select one or more SEED channel codes. | any | string1 |
| Time Constraints | ||||
| startchange | 2010-10-10T00:00:00 | Limit results to changes in metadata occurring on or after the specified start time | any | day/time |
| endchange | 2010-10-10T00:00:00 | Limit results to changes in metadata occurring on or before the specified end time | any | day/time |
| starttime | 2002-01-01T12:00:00 | Define start of time range for channel and station epochs | any | day/time |
| endtime | 2013-01-01T23:59:59 | Define end of time range for channel and station epochs | any | day/time |
| Class Types | ||||
| class | ChannelOrientation | Station or Channel level change. See Metadata Changes chart for potential values. | all | string1 |
| detail | Azimuth | Type of change applied. See Metadata Changes chart. for potential values. | all | string1 |
| description | Stage:2* | Sub-string selection of the text listed in the Description parameter field. |
all | string1 |
| Format and Output Options | ||||
| limit | 10 | Limit results to the specified number of changes. | unlimited | integer |
| format | xml | Specify output format. XML is only currently valid format. | xml | string |
| nodata | 404 | Specify which HTML Status code is returned when no data is found2. | 204 | 204 or 404 |
1 Accepts wildcards and lists
2 By default, the service returns a HTTP response code of 204 when the request was successful, but no data (ie., no content) was returned. However, when this occurs no error message is generated and it may appear that the browser does nothing. To force an empty response to display an error message add nodata=404 to the URL.
Metadata Changes: Class and Detail
For the schema location (in FDSN StationXML) of each change, see the Help section.
| Class | Detail | Information about Change |
|---|---|---|
| Station | Added | Added station, completely new to the DMC’s metadata holdings |
| Removed | Removed station, completely removed from the DMC’s metadata holdings | |
| StartTimeChange | Network:Station | |
| EndTimeChange | Network:Station | |
| Channel | Added | Added channel epoch for existing station |
| Removed | Removed channel epoch for existing station | |
| StartTimeChange | Channel start epoch change, new entry overlaps previous entry | |
| EndTimeChange | Channel end epoch change, new entry overlaps previous entry | |
| StationLocation | Latitude | Change in station latitude |
| Longitude | Change in station longitude | |
| Elevation | Change in station elevation | |
| ChannelLocation | Latitude | Change in channel latitude |
| Longitude | Change in channel longitude | |
| Elevation | Change in channel elevation | |
| Depth | Change in channel depth | |
| ChannelOrientation | Azimuth | Change in channel azimuth |
| Dip | Change in channel dip | |
| ChannelData | SampleRate | Change in channel sample rate |
| ChannelDescription | SensorType | Change in channel sensor type |
| ChannelSensitivity | Value | Change in channel sensitivity |
| Frequency | Change in frequency of channel sensitivity | |
| Polynomial | Change in any coefficient of the polynomial | |
| InputUnits | Change in sensitivity input units | |
| OutputUnits | Change in sensitivity output units | |
| ChannelSensor | Sensor | Change of any element or attribute value in Stage 1. Changes in response repeat values are not listed individually. |
| ChannelDigitalResponse | DigitalResponse | Change of any element or attribute value in Stages 2-N, log record indicates which Stage changed. Changes in response repeat values are not listed individually. |
WADL
Retrieve the WADL associated with this service:
Date and Time Formats
Year, Month, Day in Month — Time:
YYYY-MM-DDThh:mm:ss[.ssssss] ex. 1997-01-31T12:04:32.123
YYYY-MM-DD ex. 1997-01-31 a time of 00:00:00 is assumed
Where:
YYYY :: four-digit year MM :: two-digit month (01=January, etc.) DD :: two-digit day of month (01 through 31) T :: date-time separator hh :: two digits of hour (00 through 23) (AM/PM NOT allowed) mm :: two digits of minute (00 through 59) ss :: two digits of second (00 through 59) ssssss :: one to six digits representing decimal fractions of a second, down to microseconds
Glob Expressions
Wildcards
The question mark ? represents any single character (exactly one), while the asterisk * represents zero or more characters. These wildcards work when specifying a target, but not when specifying a SNCLQ filter.
Problems with this service?
Please send an email report of which service you were using, your URL query, and any error feedback to:
[email protected]
We will address your issue as soon as possible.
