A mobile app for citizen science tagging of tree data. Benefits: 1) Improve data entry process, 2) remove need for specialised measuring tools, 3) cloud-based document storage for easy shared access. The concept was proposed by Gitte Venicx and Mark Chandler of Earthwatch Institute. The app was developed by Andy Hall and Paul Lam.

This project is solving the Tree Factor challenge.


Full document online at Hackpad

Engage people in science for sustainability

Team Contact
Gitte Venicx (Earthwatch), [email protected]
Mark Chandler (Earthwatch), [email protected]
Andy Hall, game developer, [email protected]
Paul Lam, data engineer, [email protected]

"Trees within urban landscapes make up the urban forest. These trees provide a wealth of benefits called ecosystem services. These services include climate change mitigation, storm water filtration, and energy conservation. But a city is a harsh environment for a tree. Many will fail to grow into a healthy mature tree: some may contract diseases or be victim to harmful pests; still more may be removed before ever reaching full size. Just a few simple measurements tracked over time greatly improve knowledge about the health, longevity, and impact of trees in our urban centers." -- Earthwatch (

Using data to improve our knowledge about urban trees involves 3 activities.
1.Data collection -- volunteers go around the city taking measurements of urban trees
2.Data analysis and modelling -- lots of data in different places and different shapes
3.Taking actions on the data -- existing projects like Earthwatch's

We were brought together through the Space Apps Challenge in Cambridge, Massachusetts, USA on April 12 & 13, 2014. We volunteered our weekend and collective brainpower to tackle this issue.

For the full document and how we tackled this problem see the Hackpad at:

Project Information

License: MIT license (MIT)

Source Code/Project URL:


Hackpad -


  • Gitte Venicx
  • Paul Lam
  • Andy Hall