Demonstration videos

In a nutshell

photrack is all about measuring flows with images. Our main business are discharge measurements of rivers, streams, irrigation furrows with webcams & smartphones. 3D particle tracking velocimetry (3D-PTV) of objects moving in water or air is our second expertise.

For discharge measurements we offer two systems, the DischargeKeeper, a fixed IP camera with local processing and an Android app, the DischargeApp. Currently, our systems are being used and tested in Switzerland, Germany, Luxembourg, Spain, India, China, Canada, Tanzania, Kenya, Uganda, Ethipia, Kyrgyzstan, and soon to come also in Mozambique and Tajikistan.

With our strong background in 3d particle tracking off more than 15 years experience we can offer custom designed systems matching your needs. The 3D-PTV technique allows for whole field, full 3D access to the path, velocities and acceleration of objects of any shape. Our experience ranges from lab conditions to field experiments, employing multiple cameras or our special image splitter, which allows for several view points with just one camera.


Federal Office for the Environment (FOEN)
Development and Cooperation (DEZA)

About us

The company photrack AG was founded as an ETH Spin-off in January 2012 by Dr. Beat Lüthi. Beat Lüthi was associated with IfU, the Institute of environmental engineering at ETH Zürich. The hydromechanics group of IfU, now led by board member Prof. Markus Holzner, is specialized in turbulent flows and 3D particle tracking velocimetry.

Over the last five years photrack has developed a fully automatic webcam based river discharge measurement system in collaboration with the hydrological section of the Federal Office for the Environment (FOEN). In collaboration with FOEN, ETH, Hydrosolution and SDC the system has become mobile and can now also be operated with smartphones.


Beat Lüthi

PhD., Mechanical Engineer (CEO)

Salvador Peña-Haro

PhD., Hydraulic and Environmental Engineer

Maxence Carrel

PhD., Environmental Engineer

Board Members

Beat Lüthi

PhD., Mechanical Engineer (President)

Florian Bauder

PhD., Medical Doctor

Markus Holzner

Prof., Environmental Engineer

Barbara Tänzler Lüthi

Editor at Transhelvetica