Lesson 1, Topic 1
In Progress

Forest Mapping


With ALOS PALSAR Mosaics

In this tutorial you are going to learn how to map forest areas with the help of ALOS PALSAR data. You will use SNAP to process two images with two polarisations of the Para region in the Amazon. According to the WWF, over 17 % of forest has been lost in the Amazon within the past 50 years.

You will learn how to derive a forest/non-forest map by using two time steps and two radar polarisations (HH/HV).


In order to do this tutorial, you have to make sure you’ve installed SNAP. If you did not, please go back to lesson 2 and follow the instructions in the topic Introduction to SNAP.

Get the data

For this tutorial you can download a prepared data set here. The data is packed in one ZIP archive and already subsetted for you.

Data providedy by:

You can obtain global ALOS PALSAR mosaics and global forest/non-forest maps here. (After registration)

In case you have a slow internet connection, you can alternatively download a subset of the above mentioned data here.



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