CORINE Land Cover 2006 for Continental Portugal

2 Production
Production
Production
2.1 Produ Production Produ ction strategy
strategy
The strategy designed in the framework of the GMES Land FTSP project considered two
possible methodological approaches for producing CLC-Changes-2000-2006 and
CLC2006: (a) Update first approach and (b) Change mapping first approach. Figure 1
illustrates these two approaches.
CORINE Land Cover 2006 for Continental Portugal 3
Caetano et al., 2009
revision of
CLC2000
a) Update first approach
GIS based derivation of
CLC-Change
interpretation of
CLC2006
b) Change mapping first approach
revision of
CLC2000
GIS based derivation of
CLC2006
interpretation of
CLC-Change
Figure 1 - Methodological approaches for producing CLC-Changes-2000-2006 and CLC2006 (source: EEA,
2007).
In the Portuguese project the chosen approach was the “change mapping first approach”
(Caetano et al., 2009b), the same as the one applied in the predecessor project, i.e.
CLC2000 for Continental Portugal (Painho and Caetano, 2006). This approach consists in:
i. Computer-assisted visual interpretation of 2000 and 2006 satellite images to
detect real changes visible on the images and delineate change polygons that fulfil
the technical specifications of the product (EEA, 2007);
ii. Revision of the original CLC2000-PT database, simultaneously performed with i.;
iii. Derivation of CLC06_PT based on spatial analysis within a Geographic Information
System (GIS).
The maps reported here, and produced in the framework of the Portuguese GMES Land
FTSP project, are characterised in Table 1.