Aerial photography — BD ORTHO® History 1984 — Calvados
Description
BD ORTHO® History of 1984 produced by the IGN on the entire Department of Calvados. The BD ORTHO® Historical 1984 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 1984 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 1984 ORTHO® Historical 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_1984.zip.001). Needless to click 002, 003, 004... Opening the.001 file opens all the other parts of the archive.
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_1984\1984.vrt -addalpha -srcnodata 255 -hidenodata D:\Ortho_1984\data\*.TIF
gdalwarp D:\Ortho_1984\1984.vrt D:\Ortho_1984\1984.gpkg -t_srs EPSG:2154 -r cubic -of gpkg
gdaladdo -r cubic D:\Ortho_1984\1984.gpkg 4 16 64 256
“’
Resources
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Description |
Link |
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0 |
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https://www.data.gouv.fr/api/1/datasets/r/3404c97f-83e3-4e0f-9a9b-3b7a6dac3fdb |