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Structural

Bernardo Niebuhr edited this page Feb 28, 2018 · 13 revisions

Metrics of structural connectivity

Here we will show the outputs of each metric and a print of their Query results in GRASS GIS display.

Create Binary map

See this binary map of Rio Claro based on forest classes (not necessarily native forest).

Query results are below:

Patch size map

_patch_AreaHA

Summed area of one or more fragments connected by structural corridors (including the area of the corridors connecting them); if there are no fragments connected to the fragment in question, the value of this metric is equal to “fragment size”;

See query results below:

Fragment size map

_0060m_fragment_AreaHA

Area (given in ha) of any structurally isolated fragment, of any size, or the area of a fragment connected to another fragment by a structural corridor. Structural corridors are identified as parts of fragments with a width smaller than two times the specified edge depth;

Query results are below:

Structural connectivity

_0060m_structural_connectivity

Difference (given in ha) between the Patch size and the Fragment size metrics; when a patch has only one fragment, its structural connectivity will be zero.

Query results are below:

Proportion of habitat

_habitat_pct_1000m

Proportion of the target landscape classes considering a selected window size.

Query results are below:

How to choose the window size?

The user must decide which window size will be used to calculate metrics. It corresponds to search extent from each pixel where the calculations will be applied. It can be based on the extent of landscape perception of the target species, process or groups analyzed. It is given in meters.