CORINE Land Cover 2006 for Continental Portugal

CORINE Land Cover 2006 for Continental Portugal 11
Caetano et al., 2009
Summer 2006
False colour True colour
Figure 6 – Visualization of imagery at different scales. On top: 2006 satellite image. Below: digital aerial images
from the 2004/2005/2006 national coverage.
The orthorectified digital aerial images were available through Web Map Service (WMS).
This format allows the visualization of maps through a network connection. In order to
use this service on an ArcView 3.x platform (the one used for CLC06_PT production), we
installed an extension (WMS support) and created a series of files with Open Geospatial
Consortium (OGC) format. This allowed the access to the various layers of information
from the WMS. These layers were the following:
• Itinerary map of Portugal 1: 500 000;
• 1: 200 000 topographic map;
• 1: 100 000 topographic map;
• 1: 50 000 topographic map;
• 2004/2005/2006 aerial images.
The layers are successively loaded as the visualization scale changes. For the aerial
imagery there were two colour composites available: one for true colour and one for false
colour.
2.3 Development Development Development of of specific specific tools tools to to enhance enhance enhance the the production production process process
process
The basic tool for map production was the software Interchange 2.0 (Figure 7). This
software is an adaptation of ESRI’s ArcView 3.2 software and not only allowed for a direct