Displacement time-series can be exported as QGIS PS Time Series Viewer plugin compatible *.shp file via `save_qgis.py`.

1. Download and install [QGIS](https://qgis.org/en/site/) if you have not done so.
2. Download [ps-time-series](https://plugins.qgis.org/plugins/pstimeseries/) plugin as a *.zip file; and install it to QGIS through "Plugins -> Manage and install Plugins -> install from ZIP".
3. On the left side of QGIS window, browse to the *.shp file generated by `save_qgis.py` and add to the layer.
4. Open "View -> Panels -> Layer Styling", then on the right choose "Fill color -> Edit" and add the command below to color code the map based on velocity value.

```
ramp_color('RdBu', scale_linear(VEL, -20, 20, 0, 1))
```

<p align="left">
  <img width="1000" src="https://yunjunzhang.files.wordpress.com/2019/11/ps-time-series-viewer-1.png">
</p>

5. Click the [PS Time Series Viewer logo](https://gitlab.com/faunalia/ps-speed/blob/master/icons/logo.png) to activate the tool, and click/play on the map to display the time-series!

<p align="left">
  <img width="800" src="https://yunjunzhang.files.wordpress.com/2019/11/ps-time-series-viewer-2.png">
</p>