Growth Form and Ecotypes

MEGAN characterized vegetation types using both Growth Forms and Ecotypes

NOTE that these are large datasets (~1 Gbyte).

Growth forms:

These general vegetation categories can be distinguished by satellite imagery and so global datasets at high (30 m to 1 km) spatial resolution are available.

An example is the global (~1 km2 spatial resolution) MEGAN2017a growth form dataset which is based on the growth form distribution developed for MEGAN2.1 (Guenther et al. 2012) with updates for the contiguous USA described by Yu et al. (2017). Global datasets for each of the four growth forms can be downloaded from here: crops, grass, shrub, total tree.

In addition, MEGAN divides trees into broadleaf vs needleleaf and tropical vs extratropical in order to get canopy types for the canopy environment model. Global datasets with this information are available here: needleleaf tree fraction, tropical tree fraction

Ecotypes:

Ecotypes are composed of vegetation types that are associated with specific emission capacities. At present, global ecotype data cannot be derived solely from satellite vegetation and instead requires efforts that combine satellite imagery with ground surveys.

An example is the global (~1 km2 spatial resolution) MEGAN2017a ecotype dataset which is based on the ecoregion distribution used for MEGAN2.1 (Guenther et al. 2012) with updates for the contiguous USA based on LANDFIRE data. The MEGAN2017a global ecotype dataset is available here