Aerial photography [Orthophotography] - Department of Calvados - 2001

The orthophotography of 2001 was produced by the Department of Calvados and offers many advantages: - Spatial planning: land use, land consumption and new communication routes; - environment: coastal and forest observatory, bocage management; - Communication: visualization of the evolution of the territory. The 2001 orthophotography is freely distributed under an open licence thanks to the financial support of the Department of Calvados. **Collection context** The original files distributed by the Department of Calvados under Open License are: - in projection NTF (Paris) / Lambert zone I (EPSG: 5707); - in ECW "lossless" format per 2.5 km x 6 km slab; - with a resolution of one pixel = 30 cm; - compressed as a zip archive. In order to facilitate the use of the tiles composing the orthophoto 2001, we also offer a pyramid in GeoPackage OGC format in lambert 93. **Collection method** ``` gdalbuildvrt D:\4_Ortho_2001\2001.vrt -addalpha -srcnodata 255 -hidenodata -a_srs EPSG:5707 D:\4_Ortho_2001\data\*.ecw gdalwarp D:\4_Ortho_2001\2001.vrt D:\4_Ortho_2001\2001.gpkg -s_srs EPSG:5707 -t_srs EPSG:2154 -r cubic -of GPKG gdaladdo -r cubic D:\4_Ortho_2001\2001.gpkg 4 16 64 256 ```