Description

BD ORTHO® History of 1991 produced by the IGN on the entire Department of Calvados. The product BD ORTHO® History 1991 is a collection of digital mosaics of ancient panchromatic orthophotographs (grey levels) rectified in the projection adapted to the departmental territory (Calvados). BD ORTHO® History of 1991 is freely distributed under an open license thanks to the financial support of the Department of Calvados. The ORTHO® Historical BD consists of digital images (without covering or overloading) and georeferencing indications. The informational content allows local use up to 1: 2,000 to develop the territory. The 1991 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 distributed by the Department of Calvados under Open License are: — in legal projection Lambert 93 NTF (Paris) — EPSG: 2154; — in Geotif format per slab of 2 km x 2 km; — with a resolution of one pixel = 50 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. tif_1991.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 facilitate the use of these orthophotos, the files proposed here are in GeoPackage OGC format in lambert 93. The Geopakage was produced from the GDAL library. “’ gdalbuildvrt D:\Ortho_1991\1991.vrt -addalpha -srcnodata 255 -hidenodata D:\Ortho_1991\data\*.TIF gdalwarp D:\Ortho_1991\1991.vrt D:\Ortho_1991\1991.gpkg -t_srs EPSG:2154 -r cubic -of gpkg gdaladdo -r cubic D:\Ortho_1991\1991.gpkg 4 16 64 256 “’

Resources

Name	Format	Description	Link
	48		https://www.data.gouv.fr/api/1/datasets/r/d0f7ca09-0391-4486-abff-b4ac4a18e883
	48		https://www.data.gouv.fr/api/1/datasets/r/d7802404-f677-41a6-9976-04f65ab311a8
	0		https://www.data.gouv.fr/api/1/datasets/r/121fc15d-bf87-4d11-9f7d-02dfc322d81d
	48		https://www.data.gouv.fr/api/1/datasets/r/8ea489c6-f697-4fe7-b4e1-3137b431c98f
	48		https://www.data.gouv.fr/api/1/datasets/r/a3a565d8-1693-4b8e-abd3-ff88a27ebf2d
	48		https://www.data.gouv.fr/api/1/datasets/r/23ba97c6-3682-431d-9288-1a4c86061c4a

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