Growth Form and Ecotypes

MEGAN characterized vegetation types using both Growth Forms and Ecotypes

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

Growth forms:

MEGAN uses a growth form scheme that separates vegetation into four categories (crops, grass/herbaceous, shrub, and tree) that can be distinguished by aerial imagery and other available information at high (30 m to 1 km) spatial resolution.

One available dataset is the global 30 second (~1 km2) spatial resolution MEGAN2017 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). The MEGAN2017 global datasets for each of the four growth forms can be downloaded here: crops, shrub, grass, total tree. Note that these are large (709MB) files.

Another available dataset is the global 30 second (~1 km2) spatial resolution MEGGF3a growth form dataset. These datasets can be downloaded from here: crops, tree, grass, shrub. Note that these are large (720MB) files and that you need to use the updated version of the MEGAN FORTRAN preprocessor: MEGAN31_Prep_Code_Apr2020

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.

One available dataset is the global 30 second (~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 . Note that this is a very large (1420MB) file.

An alternative dataset is the EVT3b ecotype dataset that is based on the MEGAN2017a ecotype dataset with updates for Australia and urban Southern California: EVT3b. Note that this is a very large (1420MB) file and that you need to use the updated version of the MEGAN FORTRAN preprocessor: MEGAN31_Prep_Code_Apr2020