CORINE Land Cover 2006 for Continental Portugal

Table 7 – Examples of the tools created by the National Technical Team for the extension of Interchange 2.0.
Button Description of functionality
CORINE Land Cover 2006 for Continental Portugal 13
Caetano et al., 2009
This button zooms the view(s) to a previously defined scale.
This button pulls the dialog box for searching the shapefile based on a chosen field. The script
steps through all polygons coded in the chosen field with value 1.
This button stretches the values of the Digital Numbers for each band of the image present in the
view.
This tool enables the user to click on a polygon and check the online official description of the
respective CLC class.
This tool is used to mark cells of a control grid as “done”.
This tool transfers the clicked polygon(s) to Google Earth.
This tool lists every available image for the clicked area in the view. The user then selects from the
list, the ones to be loaded.
This tool loads into the view orthorectified aerial images from 1995 available in the clicked area or
location.
2.4 Production Production of of of CHA06_PT
CHA06_PT
The main task in this project was the production of the CHA06_PT database, which
consisted in computer-assisted visual interpretation of satellite images of the years 2000
and 2006. The image interpretation procedure included a visual comparison between the
2000 and 2006 satellite images, the detection of real changes visible in the images, and
the delineation of change polygons that fulfilled the technical specifications of the
product (EEA, 2007). The changes that were mapped were the ones that occurred between
2000 and 2006, and were detectable in the base data, larger than 5 ha and wider than
100m. The map production specifications for CHA06_PT differed from the ones of CLC-
Changes-1990-2000-PT, in the fact that for CHA06_PT all the changes larger than 5 ha
were mapped. When CLC-Changes-1990-2000-PT was produced the areas that were not
contiguous to polygons of the same class already present in 1990, were only mapped if
they had a minimum of 25 ha (Caetano et al., 2009b). The delineation of changes was
based on the polygons of CLC00_PT in order to avoid the creation of sliver polygons when
integrating that map with CHA06_PT to produce CLC06_PT. The CHA06_PT database was
produced at Working Unit (WU) level. The same way as in the predecessor project, i.e.
CLC2000 for Continental Portugal, each WU corresponded to a sheet of the National Map
Series 1: 100 000 (Figure 9).