Particle Image Velocimetry

Velocimitry

Velocimetry is a subset of metrology, and is the measurement of the velocity of the fluid. While this can be a complex process involving tracer measurements and sophisticated setups, camera technology and drones have advanced to the stage where we can track optical particle and, with georeferenced surfaces and measurement points, create a velocity field. This process, occasionally refered to as LSPIV (for large, Surface Particle Imaging Velocimetry) provides a robust, novel, and previously unavailable means of quantifying the state and fluxes of the water cycle.

Aside: “Environmental surveillance” is probably one of my next larger thrusts into scaling this process to the next step. While there are still a ton of questions, you can start here for a great singular starting point with an emphasis on the technical realization of that surveillance system.

How to manipulate blender

Blender is dark magic of the wildest kind. I don’t do it right and even more than some of my other applications, RAM and disk space are critical resources to have if you don’t want to have wait 8 years for results. I don’t know what I’m doing wrong but I’ve created multi-gig files of 15 second imagery, that can’t be right.

Video editing (misc)

Stabilizing

The first step is to stabilize the image to static markers. These are most appropriately spaced around the edges of the photo.

Tracking

Video editing (misc)

“k” to slice

Exporting to dataframe

```{python}
from __future__ import print_function
import math
import csv
import bpy
D = bpy.data

output_folder = "G:/root/database/dro"
f2=open('export-markers.log','w')
for clip in D.movieclips:
    print()
```