getEvalresp: Retrieve instrument response information from IRIS DMC

In IRISSeismic: Classes and Methods for Seismic Data Analysis

Retrieve instrument response information from IRIS DMC

Description

The getEvalresp method obtains instrument response data from the IRIS DMC evalresp webservice.

Usage

getEvalresp(obj, network, station, location, channel,
            time, minfreq, maxfreq, nfreq, units, output, spacing)

Arguments

obj	an IrisClient object
network	character string with the two letter seismic network code
station	character string with the station code
location	character string with the location code
channel	character string with the three letter channel code
time	POSIXct class specifying the time at which response is evaluated (GMT)
minfreq	optional minimum frequency at which response will be evaluated
maxfreq	optional maximum frequency at which response will be evaluated
nfreq	optional number of frequencies at which response will be evaluated
units	optional code specifying unit conversion
output	optional code specifying output type (default="fap")
spacing	optional code specifying spacing, accepted values are "lin" or "linear", "log" or "logarithmic" (default="log")

Details

The evalresp webservice responds to requests with data that can be used to remove instrument response from a seismic signal.

Each of network, station or channel should contain a valid code without wildcards. The ascii string that is used for these values is simply passed through to evalresp.

If the location argument contains an empty string to specify a 'blank' location code, a location code of "--" will be used in the dataselect request URL. (See dataselect documentation.)

The response from evalresp is converted into a dataframe with rows in order of increasing frequency.

Value

For output="fap", a dataframe with columns named:

freq, amp, phase

For output="cs", a dataframe with columns named:

freq, real, imag

Author(s)

Jonathan Callahan [e-mail]

References

The IRIS DMC evalresp webservice:

https://service.iris.edu/irisws/evalresp/1/

See Also

IrisClient-class,

IRISSeismic documentation built on Oct. 16, 2022, 1:09 a.m.