CORINE Land Cover 2006 for Continental Portugal

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CORINE Land Cover 2006 for Continental Portugal 8 Caetano et al., 2009 Table 4 – Detailed characteristics of the satellite images used as base data. Landsat 7 SPOT-5 SPOT-4 IRS P6 Sensor ETM+ HRG HRVIR LISS III Swath width (km) 180 60 x 60 – 80 x 80 Spatial resolution (m) Radiometric resolution (bits) 60 (Thermal band) 30 (Multi-spectral) 10 (Panchromatic) (depending on looking angle) 20 (Middle-infrared) 10 (Green, Red, NIR) 5 (Panchromatic) 60 x 60 – 80 x 80 (depending on looking angle) 20 (Multi- spectral) 10 (Panchromatic) 140 x 140 23,5 8 8 8 10 Number of bands 7+1 (original) 4 + 1 4 + 1 4 Blue band 0,45 – 0,52 µm (TM1) --- --- --- Green band 0,53 – 0,61 µm (TM2) 0,50 – 0,59 m 0,50 – 0,59 µm 0,52 – 0,59 µm Red band 0,63 – 0,69 µm (TM3) 0,61 – 0,68 m 0,61 – 0,68 µm 0,62 – 0,68 µm Near-infrared band (NIR) Middle-infrared band Thermal-infrared band 0,75 – 0,90 µm (TM4) 0,78 – 0,89 m 0,78 – 0,89 µm 0,77 – 0,86 µm 1,55 – 1,75 µm (TM5) 1,58 – 1,75 m 1,58 – 1,75 µm 1,55 – 1,70 µm 10,4 – 12,5 µm (TM6) --- --- --- Far-infrared band 2,09 – 2,35 µm (TM7) --- --- --- Panchromatic band 0,52 – 0,90 µm (PAN) 0,48 – 0,71 m 0,61 – 0,68 µm --- Observation mode Vertical only Tiltable sensor (up to ± 31º) Tiltable sensor (up to ± 31º) Vertical only Temporal resolution 16 days 2-3 days 2-3 days 25 days Reference system ETRS89-PT06 ETRS89-PT06 ETRS89-PT06 ETRS89-PT06 The images of the reference year 2006 were taken both in spring and summer periods in order to allow for the analysis of changes in vegetation phenological characteristics and thus improve the discrimination between land cover classes. Figure 4 shows an example of a region mainly occupied by agriculture, where irrigated and non-irrigated arable crops are better identified through the comparison of spring and summer images.
CORINE Land Cover 2006 for Continental Portugal 9 Caetano et al., 2009 Spring 2006 Summer 2006 Figure 4 - Spring and summer satellite images of irrigated and non-irrigated arable areas. 2.2.2 2.2.2 Ancillary Ancillary Ancillary data data In order to support and improve the visual interpretation of the landscape, additional data of Continental Portugal was provided to the photo-interpreters. Table 5 shows a compilation of the ancillary data used in this project. Table 5 – Summary of ancillary data characteristics. Data Reference year Owner Scale Orthorectified digital aerial imagery - national coverage Orthorectified analogue aerial imagery - national coverage Land Cover Map of Continental Portugal for 1990 (COS’90) 2004, 2005 and 2006 MMU / Resolution (m) Format IGP/DGRF 1: 25 000 0,50 m Raster 1995 IGP 1: 25 000 1m Raster 1990 IGP 1: 25 000 1 ha Vector Yearly burned area maps 2000-2006 DGRF 1: 100 000 5 ha Vector National Forest Inventory 1995 (IFN1995) 1995 DGRF --- 0,5 ha Vector Vineyard Information System 1930-2000 IVV --- --- Vector Official Administrative Map of Portugal (CAOP) 2008.1 IVV – Institute of Wine and Vineyard; DGRF – General Directorate of Forests 2008 IGP 1: 25 000 --- Vector The main ancillary data used by the photo-interpreters was the 2004/2005/2006 national coverage of orthorectified digital aerial images. The characteristics of these ortho-images are summarized in Table 6 and the respective acquisition dates are shown in Figure 5. Figure 6 shows an example of the detail that can be achieved using these aerial images as ancillary information for land use and land cover (LULC) mapping.
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CORINE Land Cover 2006 for Continental Portugal

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