A d3-based SU (Seismic Unix) viewer and picker. The viewer is built on nwjs, a technology that let's one run web-based applications on the desktop. The display is through d3, a javascript library for visualization.

This tool allows one to pick the times of events of interest in a seismic file and save the picks to a text file.

Javascript does not have a segy reader, thus we use python to read su and segy files and serve them to the picker through WebSockets.

Download nwjs (http://nwjs.io)

Install node (http://nodejs.org), which includes npm (the node package manager)

Install bower (another package manager(?))

npm install bower -g

git clone https://github.com/sanandak/d3-su-picker
cd d3-su-picker
# install the required packages
bower install
npm install

Install python3 3.5 or less (preferably through anaconda (http://continuum.io))

conda config --add channels conda-forge
conda install obspy
conda install websockets

These are installed by npm and bower

• d3js v4
• sprintf-js
• angularjs

These are installed by conda (pip may work - untested)

• obspy
• websockets
• numpy and scipy are installed with obspy

/path/to/nwjs /path/to/d3-su-picker

Buttons to open an SU file and to save picks.

The viewer displays the first ensemble (by default, the first ffid - field file id).

Keyboard commands:

• j and k move the cursor forward and back in time by one sample.
• J and K move the cursor by 10 samples
• h and l move the cursor to the next/previous trace
• H and L move the cursor by 10 traces
• z and Z zoom in and out in time
• t and T zoom in and out in space (fewer and more traces are displayed)
• p picks the time of the cursor
• d deletes the pick

The saved picks file is a JSON file that is an array of traces.

• sufile: file name of the picked data
• picktime: when the picking was done
• picks: an array of picks, with +/- 100 samps around the pick

Each picks member is a trace object with the following fields:

• pickT- the time of the pick
• pickIdx - the sample number
• 'pickVal` - the value
• tracl - see SU docs for the definition of these fields
• ens - the ffid or cdp ensemble number
• samps (an array) - 100 samps before the pick and 100 after

Each member of samps is an object with t and v fields: {t: 0, v: .01}

• Read SEG-Y files.
• Read pick files.
• populate pick file more fully