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Landscapes Forest and Global Change - ESA - Escola Superior ...

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M. Deconchat et al. 2010. Identification <strong>and</strong> characterization of forest edge segments for mapping edge diversity<br />

483<br />

McGarigal, K., Tagil, S. <strong>and</strong> Cushman, S., 2009. Surface metrics: an alternative to patch metrics<br />

for the quantification of l<strong>and</strong>scape structure. L<strong>and</strong>sc. Ecol., 24:433-450.<br />

Murcia, C., 1995. Edge effects in fragmented forests - implications for conservation. Trends in<br />

Ecology & Evolution, 10:58-62.<br />

Taylor, R.S., Oldl<strong>and</strong>, J.M. <strong>and</strong> Clarke, M.F., 2008. Edge geometry influences patch-level<br />

habitat use by an edge specialist in south-eastern Australia. L<strong>and</strong>sc. Ecol., 23:377-389.<br />

Vogt, P., Riitters, K.H., Estreguil, C., Kozak, J. <strong>and</strong> Wade, T.G., 2007. Mapping spatial patterns<br />

with morphological image processing. L<strong>and</strong>sc. Ecol., 22:171-177.<br />

Zeng, H. <strong>and</strong> Wu, X.B., 2005. Utilities of edge-based metrics for studying l<strong>and</strong>scape<br />

fragmentation. Computers, Environment <strong>and</strong> Urban Systems, 29:159-178.<br />

Table 1: Description of the paramaters used in the different step of the process of Mapedge.<br />

Step Process Parameter Value<br />

1 Classification Resolution of SPOT 5 10 m<br />

Foreground Connectivity, for a set of 3 x 3 pixels the<br />

center pixel is connected to its adjacent neighboor pixels<br />

by having either.<br />

Connectivity<br />

= 8 pixels<br />

2<br />

Treatment under<br />

Guidos :<br />

Morphological Spatial<br />

Pattern Analysis<br />

3 Generalization<br />

5<br />

Creation of transect 90°<br />

Calculation<br />

L<strong>and</strong><br />

cover<br />

Edge Depth.<br />

Transition pixels are those pixels of an edge or a<br />

perforation where the core area intersects with a loop or<br />

a bridge. If Transition is set to 0 then the perforation <strong>and</strong><br />

the edges will be closed core boundaries.<br />

Intext allows distinguishing internal from external<br />

features, where internal features are defined as being<br />

enclosed by a Perforation. The default is to enable this<br />

distinction which will add a second layer of classes to the<br />

seven basic classes.<br />

Generalize tolerance reduces the number of vertices<br />

required to represent a polygon, the features of a polygon<br />

layer using the Douglas-Poiker algorithm.<br />

Script python what create perpendicular lines, takes a<br />

line shapefile <strong>and</strong> generates perpendicular lines to each<br />

record with length expected.<br />

Intersects the end-point of transect to l<strong>and</strong> cover at a<br />

point distance expected.<br />

Get Z characteristics with Digital Elevation Model<br />

Compare the edge to the transect segment with same<br />

Slope of length<br />

the edge Result :<br />

- Inslope with tolerance<br />

- Downslope<br />

- Upslope<br />

Cardinal<br />

Calculates the angle of a polyline in degrees<br />

orientation<br />

Size = 2<br />

pixels<br />

Transition =<br />

0<br />

Intext = 0<br />

20 meters<br />

40 meters<br />

40 meters<br />

25 meters<br />

resolution<br />

40 meter<br />

Tolerance 1<br />

meter<br />

360 degrees<br />

<strong>Forest</strong> <strong>L<strong>and</strong>scapes</strong> <strong>and</strong> <strong>Global</strong> <strong>Change</strong>-New Frontiers in Management, Conservation <strong>and</strong> Restoration. Proceedings of the IUFRO L<strong>and</strong>scape Ecology<br />

Working Group International Conference, September 21-27, 2010, Bragança, Portugal. J.C. Azevedo, M. Feliciano, J. Castro & M.A. Pinto (eds.)<br />

2010, Instituto Politécnico de Bragança, Bragança, Portugal.

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