Aerial Photography High Resolution [ORTHO® HR — IGN-F] — Department of Calvados — 2020

The ORTHO® HR (High Resolution Orthophotography) of 2020 is a collection of digital mosaics of colour orthophotographs, rectified in the specific legal projection adapted to the covered territory. The ORTHO® HR 2020 is freely distributed under an open license thanks to the financial support of the European Union and the Normandy Region. It is requested that all studies carried out from this database include the particular mention produced with the support of Europe and the Normandy Region in the framework of the CRIGE Normandy”. The ORTHO® HR of 2020 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 distributed by the IGN on https://geoservices.ign.fr/documentation/diffusion/telechargement-donnees-libres.html#ortho-hr-sous-licence-ouverte under Open License are: — in legal projection (Lambert 93 in metropolis and other specific projection for each DOM) — JPEG2000 “lossless” format per slab of 1 km x 1 km — compressed as a 7z archive (long to decompress for marginal compression gain, slabs already compressed) Below you will find links to access “multi-party” files for free download on the IGN website. 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_2020.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 making up the HR 2020 orthophoto, we also offer a pyramid in GeoPackage OGC format in lambert 93. **Collection context** **Collection method** The Geopakage was produced from the GDAL library: gdalbuildvrt D:\8_Ortho_2020\2020.vrt -addalpha -srcnodata 255 -hidenodata D:\8_Ortho_2020\data\*.jp2 gdalwarp D:\8_Ortho_2020\2020.vrt D:\8_Ortho_2020\2020.gpkg -t_srs EPSG:2154 -r cubic -of gpkg gdaladdo -r cubic D:\8_Ortho_2020\2020.gpkg 4 16 64 256 For more information, see [the metadata on the Isogeo catalog](https://open.isogeo.com/s/434296189d794266a04a8678e256f0c4/HiLeps3y1qrSx6aTDmKyp0spGPix0/r/5050e0e79ac1476f81df559edbd17306).