6. May 2019

Global TanDEM-X forest map is available.

Globale TanDEM-X Waldkarte
Global TanDEM-X forest map
Image 1/5, Credit: DLR (CC-BY 3.0)

Global TanDEM-X forest map

The global TanDEM-X Forest/Non-Forest Map was derived from interferometric radar data and is freely available for scientific applications.
TanDEM-X forest map – Alps
TanDEM-X forest map – Alps
Image 2/5, Credit: DLR

TanDEM-X forest map – Alps

Section of the TanDEM-X forest map over the Alps.
TanDEM-X forest map – southern Germany
TanDEM-X forest map – southern Germany
Image 3/5, Credit: Google Earth/DLR

TanDEM-X forest map – southern Germany

Comparison of a Google Earth image with the TanDEM-X forest map for a region in southern Germany. Individual rows of trees at the edges of fields can be clearly distinguished in the image, demonstrating the degree of detail offered by the forest map.
Dramatic deforestation in Brazil
Dramatic deforestation in Brazil
Image 4/5, Credit: DLR

Dramatic deforestation in Brazil

The TanDEM-X Forest/Non-Forest Map for an approximately 250-kilometre by 250-kilometre area in the Brazilian state of Rondônia shows the dramatic development of deforestation in the rainforest.
Comparison – deforestation in the Amazons
Comparison – deforestation in the Amazons
Image 5/5, Credit: GoogleEarth/DLR

Comparison – deforestation in the Amazons

Comparison between a Google Earth image and the TanDEM-X forest map for an area in the Amazon rainforest affected by deforestation. For the first time, the TanDEM-X data provide a precise insight and overview of deforestation in the most remote regions, so that illegal activities in particular can be detected.
  • Global TanDEM-X forest map with 50-metre resolution freely available for scientific use
  • Monitoring, assessment and protection of the world’s forest resources
  • Interaction between interferometric data from the global TanDEM-X elevation model and intelligent algorithms for data processing
  • Focus: Earth observation, space, climate change, TanDEM-X, Tandem-L, Artificial Intelligence, Big Data

Forests are Earth's lungs; they help to reduce greenhouse gas concentrations in the atmosphere and thus counteract global warming, while also providing protection and resources for humans, animals and plants – and they are being lost at an alarming rate. As the view from space reveals, forests cover about one third of Earth’s landmass today. More than half of the world’s forests, which have fallen victim to deforestation since the middle of the 20th century in particular, have already been lost. The German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) has created a special dataset to monitor, assess, and protect the current state and development of this green organ with precision – the global TanDEM-X Forest/Non-Forest Map. Interferometric data acquired by the German TanDEM-X radar satellite mission for the creation of a global elevation model were used for this purpose; algorithms from the field of Artificial Intelligence were developed for global data processing. These have been optimised for different types of forests based on tree height, density, and structure. This has resulted in a global map that shows the extent of forested areas at a resolution of 50 metres. DLR’s global TanDEM-X Forest/Non-Forest Map is now available free of charge to scientific users.

Radar satellites can acquire image data regardless of the weather or time of day – a particular advantage when it comes to mapping tropical forests, which are usually covered by clouds. The TanDEM-X Forest/Non-Forest Map closes the gaps that previously existed in the data and, for the first time, provides a uniform overview of the rainforests in South America, Southeast Asia, and Africa. The findings are important for authorities and scientists alike, as these areas must be protected from illegal logging and preserved as important stores of carbon.

The new map can also help scientists to more precisely determine the forest biomass – a key factor when studying the global carbon cycle. The TanDEM-X Forest/Non-Forest Map thus provides an important dataset for research into global change and makes a variety of applications in agriculture, forestry, regional development, and land-use planning possible. In addition, it also allows more precise predictions to be made and appropriate measures to be taken to address the societal challenges arising from global change.

Big Data and Artificial Intelligence

The DLR Microwaves and Radar Institute has processed more than 400,000 datasets for the project. The datasets were acquired between 2011 and 2015 as part of the TanDEM-X mission. The radar experts have developed special algorithms that first evaluate each image individually and then combines them to form a global map with the goal of extracting and classifying forest-related information from the vast quantities of data. These algorithms are based on machine learning in the field of Artificial Intelligence. More information is available in an article published in the journal 'Remote Sensing of Environment' (Volume 205, February 2018). In the future, it will be possible to evaluate new satellite data and compare it with the global TanDEM-X map, for instance using time series analyses.

The developers used additional remote sensing data to validate the calculated results and differentiate forest areas from non-forested regions with a greater degree of accuracy. In particular, this includes the ‘global urban footprint’, a global map of settlements created at the DLR Earth Observation Center (EOC), as well as the mapping of water bodies by ESA’s Climate Change Initiative. The distribution of the global TanDEM-X Forest/Non-Forest Map is managed by the German Satellite Data Archive at the EOC and made available to users. The German Space Operations Center (GSOC) is responsible for the operation of the TanDEM-X radar satellite mission.

Tandem-L – forest monitoring in the future

Assessing and monitoring forest resources is a key task for current and future radar satellite missions. In particular, Tandem-L – a proposal for a highly innovative satellite mission – could in the future generate forest maps on a weekly basis and derive forest height, structure, and biomass accordingly. With its innovative imaging technology and the resulting enormous recording capacity, Tandem-L is also designed to observe other dynamic environmental processes on the Earth’s surface. The mission will set new standards in Earth observation and thus significantly contribute towards addressing global societal challenges.

  • Bernadette Jung
    Communications Oberpaffenhofen, Weilheim, Augsburg
    German Aerospace Center (DLR)

    Public Affairs and Communications
    Telephone: +49 8153 28-2251
    Fax: +49 8153 28-1243
    Münchener Straße 20
    82234 Weßling
  • Dr Paola Rizzoli
    DLR German Aerospace Center (DLR)
    Microwaves and Radar Institute
    Telephone: +49 8153 28-1785
    Münchner Straße 20
    82234 Oberpfaffenhofen-Weßling
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