Arboreal Forest - a real digital Caliper

A lot of people are talking about the digital revolution. Arboreal walks the walk and offer you a real digital experience of measurements.  For real – you should leave your manual tools at home. For real – it is a digital solution, not some boring manual tool with a dull grey-black screen. For real – a digital tool that could be downloaded to your phone. For real – you should be able to measure everything digital, without the extra support of reference signs and sticks.  

Benefits of using Arboreal Forest?

  • Your measuring tools are all always with you.
  • Good accuracy.
  • You get the result immediately.
  • No extra reference tools or sticks are needed.
  • You will recognize the method if you have been measuring a forest before.
  • You have full control.
  • Skip paper and pen and avoid extra work.
Arboreal Skog Screenshot

How does it work?

You are measuring the trees in sample plots in the forest. First, you select the plot size and place the center on a good spot. After that, you walk around and measure the trees inside of the border. 


You will see the border when you get close, you will also see the center of the plot and the distance to the center. When you have measured all trees, you continue to measure the height of a representative tree for each tree species. 


The app will suggest the most representative tree in the plot, which you should mark. Walk away some distance and aim and mark the base and the top of the tree.


You get the result and will see the distribution of the diameters in a chart.



How accurate is the result?

We have tested the application in different forests and we are comfortable with the result. The most diameters are within two centimeters. The bias is very low and that results in a good estimate of mean diameter, trees per ha, and basal area. 

The largest error source is where you place the sample plots. The plots should be placed on representative parts of the forest. If you are not an experienced forester, you should place a lot of sample plots.


The method has been evaluated in a Master thesis by Lisa Lindberg at the Swedish University of Agricultural Sciences. The result is similar and you could download the study here.


We have continued to develop the application since the external evaluation and now it even better.


Sveaskog evaluated the app in a report 2021: Arboreal Forest Evaluation Sveaskog Beltinventory

How do I start using it?

The app is available on App Store.

You could test up five times for free. If you want to continue using the app you could subscribe per week or month.

You will always have access to your measurements even after you discontinue the subscription. 

Payments are done in the app.

New features

In May 2020 we released a new method to measure. 

You could measure the trees along a transect. You measure all trees that are within two meters of a red line.

It is easier and it gives a more representative result from the forest. 

In September 2020 we released three new features.

In some countries you now have automatic tree species detection.

You could tap on the last tree and change the tree species

You will also get a warning if you try to measure a tree that is outside of the sample plot.