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This function utilises the IRIS time series web service to provide a plot from the parameters sent in the query. QVSData provides an interface to the service for the most common uses as a provider of PNG Plots.
Data download and Audio creation elements are dealt with separately.
The plot form is accessed from the View Menu.
On opening the form looks like this (except the dates will be current and the dimensions will be blank)
Once you have used the program the opening screen may be slightly different as some parameter states are saved and reloaded the next time you open the form.
Changes in version 18.104.22.168
The form has changed from its original release as the networks, stations and channels can now all be selected based on the real time network lists BUT because data may be available from other archived sources this is not fixed and you can switch between "Dropdown" which is the opening format and uses the networks data, and "Manual" where you can enter the network, station, location and channel data manually.
Also changed is the addition of a toolbar to allow the reloading of the initial settings, closing without saving settings and closing normally which saves the settings. Be aware that closing the form with ANY other method than "Close WITHOUT saving settings" will save the settings. The only time this will not occur is if Windows crashes.
The Pro version has an additional button to reload the Band Pass settings. Also in Pro, but not visible on this form, is the ability to link direct from the display lists to this form. See the Display Screen Context Menus (Pro) for more details.
The Preview window has also changed and can now display the image full size by pressing the enter key. Scroll bars appear to allow you to navigate the dimensions of the image. You n now save the image if you elected to display only and decide you wish to keep it. Right click to save. The save will happen when you close the Preview window.
The bare minimum to produce a plot requires the Network, station, location (if any), a channel (for example BHZ), a start date and an end date. With that information it is possible to produce a plot.
On the form is a sub-set of the full parameters found on the web site – as applicable to plots – but these should be sufficient for most purposes.
The following is a listing of the parameters on the web site with those not used here greyed out.
|Network||1 or 2 character network code|
|Station||Up to 5 character station code|
|Location||2 character location identifier|
|Channel||3 character channel codes|
The program accepts 2 letters and a single wildcard i.e. BH* or BH?. Wildcards do NOT work with plots on the web service but you can use a wildcard for 1,2,Z or E,N,Z in the program. The sequence is set by a radio button.
|Start Time||Waveform start time.|
|End Time||Waveform end time.|
|Correct||Perform Instrument Correction applies deconvolution or polynomial response correction.
Set using the option of that name
|Frequency Limits||Specify an envelope for a spectrum taper for deconvolution.|
|Auto Limits||Automatically determine frequency limits for deconvolution..|
|Scale||Scale data by given factor.|
|Div-Scale||Inverse scale data by given factor.|
|Remove Mean||Remove mean value from data.|
|Low–Pass Filter||Low–pass filter the time–series using an IIR 4th order filter. Hertz.|
|High–Pass Filter||High–pass filter the time–series using an IIR 4th order filter. Hertz.|
|Band–Pass Filter||Band–pass frequencies. Hertz|
|Differentiate||Differentiate using 2 point (un-centered) method|
|Integrate||Integrate using trapezoidal (midpoint) method.|
|Envelope||Calculate the envelope of the time series. This calculation uses a Hilbert transform approximated by a time domain filter.|
|Taper||Apply a symmetric tapering function to the timeseries data|
|Taper Window Type||Choose the taper window function|
|Plot Dimensions||Width and height in pixels.|
|Anti Alias Plot||Reduce jagged appearance of plots|
A completed form might look like this:
If the plot is to be saved then you will be asked to select the folder. If the plot is to be displayed then it will appear in a small window which can be expanded to full screen:
Other similar or related topics
None relevant at this time
This page was last updated 09 September 2013 (Version 22.214.171.124)