Aerial photography [BD ORTHO® — IGN-F] — Department of Calvados — 2012

The 2012 ORTHO® BD is a collection of digital mosaics of colour orthophotographs, rectified in the specific legal projection adapted to the covered territory. The 2012 ORTHO® BD 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 original files produced and distributed by the IGN under Open License are: — in legal projection (Lambert 93 in metropolis and other specific projection for each DOM) — in ECW format per slab of 5 km x 5 km — with a resolution of one pixel = 20 cm; — compressed as a zip archive. Below you will find links to access “multi-party” files for free download. To unzip “multi-parts” 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. ecw_2012.zip.001). No need to click 002, 003, 004... Open file.001 opens all 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 composing the orthophoto 2012, we offer a pyramid in GeoPackage OGC format in lambert 93. **Collection method** The Geopakage was produced from the GDAL library: * gdalbuildvrt D:\7_Ortho_2012\2012.vrt -addalpha -srcnodata 255 -hidenodata -a_srs EPSG:2154 D:\7_Ortho_2012\data\*.ecw * gdalwarp D:\7_Ortho_2012\2012.vrt D:\7_Ortho_2012\2012.gpkg -s_srs EPSG:2154 -t_srs EPSG:2154 -r cubic -of gpkg * gdaladdo -r cubic D:\7_Ortho_2012\2012.gpkg 4 16 64 256 For more information, see [the metadata on the Isogeo catalog](https://open.isogeo.com/s/434296189d794266a04a8678e256f0c4/HiLeps3y1qrSx6aTDmKyp0spGPix0/r/6801f773803d4a639c4382bae93051e6).