Aerial photography — orthophography 2006 — Calvados

The 2006 orthophotograph was produced by the Calvados Department and offers many advantages:
— spatial planning: land tenure, land use and new communication channels;
— environment: coastal and forest observatory, bocage management;
— communication: visualisation of the evolution of the territory.

The 2006 orthophotograph is freely distributed under an open license with financial support from the Calvados Department.

The original files distributed by the Department of Calvados under Open License are:
— projection NTF (Paris)/Lambert zone I (EPSG: 5707);
— in ECW 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 links to access “multi-party” files for free download.
To unzip “multi-part” files:
— Make sure you have downloaded all the parts: 001, 002, 003...
— Put all parts in the same directory
— Click on file 001 (e.g. ortho_2006.zip.001). Needless to click 002, 003, 004... Opening the.001 file opens all the other parts of the archive.
If you have an error there is a good chance that one of your files was only partially downloaded.

In order to make it easier to use the tiles making up the orthophoto 2006, we also offer a pyramid in GeoPackage OGC format in lambert 93. The Geopakage was produced from the GDAL library.
“’
gdalbuildvrt D:\Ortho_2006\2006.vrt -addalpha -srcnodata 255 -hidenodata -a_srs EPSG:5707 D:\Ortho_2006\data*.ecw

gdalwarp D:\Ortho_2006\2006.vrt D:\Ortho_2006\2006.gpkg -s_srs EPSG:5707 -t_srs EPSG:2154 -r cubic -of gpkg

gdaladdo -r cubic D:\Ortho_2006\2006.gpkg 4 16 64 256
“’