Forest change mask

Base Forest mask and Fragmentation tool

This application allows the user to: - define an area of interest - retrieve tree cover change data from the Hansen et al., (2013) dataset - combine the layers to produce a forest change map, for a given canopy cover threshold

Background info on GFC

GFC provides global layers of information on tree cover and tree cover change since 2000, at 30m spatial resolution and consists of:

  • Tree canopy cover for the year 2000 (treecover2000)

  • Global forest cover gain 2000–2012 (gain)

  • Year of gross forest cover loss event (lossyear)

For more information please refer to:

https://earthengine.google.com/static/images/hansen.jpg

worldwide GFC

Usage

Select an AOI

Using the provided AOI selector, select an AOI of your choice between the different methods available in the tool. We provide 3 administration descriptions (from level 0 to 2) and 3 custom shapes (drawn directly on the map, asset or shapefile).

https://raw.githubusercontent.com/openforis/gfc_wrapper_python/master/doc/img/select_aoi.png

aoi selector

Note

If a custom aoi from shape or drawing is selected, you will be able to use it directly and the upload to GEE will be launched in the background

GFC visualization

Use the slider to change the threshold to consider between forest and non-forest areas. Once you’ve selected a value, click on update map to update the interactive map layers.

The new layer is a combination of the GFC layers to produce a forest change map, for a given canopy cover threshold. The legend is displayed in the map. You’re allowed to zoom in-out as the data are processed in GEE.

When changing the value of the threshold, a new layer will be added to the map so you can compare and select the more appropriate value of threshold for your analysis.

Warning

The value that will be used for the next step is the last asked value of threshold. If you want to come back to a previous value, move the slider back and click on update map again.

https://raw.githubusercontent.com/openforis/gfc_wrapper_python/master/doc/img/viz.png

vizualization

Export selected data

Considering the Aoi selected in step 1 and the threshold selected in step two the module will generate a combination of the GFC layers to produce a forest change map, for a given canopy cover threshold. It will live in a ~/gfc_wrapper_results folder of your sepal environment.

2 results will be produced: - the map of the forest change mask using the color tab presented in the interactive maps - the distribution of each defined zone in a .csv file

You can download these two files directly from the interface using the green buttons

https://raw.githubusercontent.com/openforis/gfc_wrapper_python/master/doc/img/export.png