Aerial photography [Orthophotography] - Department of Calvados - 2006

The orthophotography of 2006 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 orthophotography of 2006 is freely distributed under an open licence thanks to the financial support of the Department of Calvados.

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.

Below you will find the links to access the "multi-part" files for free download.
To unzip multi-part files:
- Make sure you have downloaded all parts: 001, 002, 003...
- Put all the parts in the same directory
- Click on file 001 (ex: ortho_2006.zip.001). No need to click on 002, 003, 004... Opening the .001 file opens all other parts of the archive
If you have an error, chances are that one of your files has only been partially downloaded.

In order to facilitate the use of the tiles composing the orthophoto 2006, we also offer a pyramid in GeoPackage OGC format in lambert 93.

Collection method
The Geopakage was produced from the GDAL library

gdalbuildvrt D:\4_Ortho_2006\2006.vrt -addalpha -srcnodata 255 -hidenodata -a_srs EPSG:5707 D:\4_Ortho_2006\data*.ecw

gdalwarp D:\4_Ortho_2006\2006.vrt D:\4_Ortho_2006\2006.gpkg -s_srs EPSG:5707 -t_srs EPSG:2154 -r cubic -of GPKG

gdaladdo -r cubic D:\4_Ortho_2006\2006.gpkg 4 16 64 256

For more information, see Isogeo Catalog metadata.