Aerial photography — BD ORTHO® History 1972 — Calvados

Description

BD ORTHO® History of 1972 produced by the IGN on the entire Department of Calvados. The BD ORTHO® Historical 1972 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 1972 is freely broadcast under 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 ORTHO® Historical 1972 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 ECW format per slab of 10 km x 10 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. ecw_1972.zip.001). Needless to click 002, 003, 004... Opening the.001 file opens all the other parts of the archive. In order to make these orthophotos more directly usable, the files are also available here in GeoPackage OGC format in lambert 93. The Geopakage was produced from the GDAL library “’ gdalbuildvrt D:\Ortho_1972\1972.vrt -addalpha -srcnodata 255 -hidenodata D:\Ortho_1972\data\*.ecw gdalwarp D:\Ortho_1972\1972.vrt D:\Ortho_1972\1972.gpkg -t_srs EPSG:2154 -r cubic -of gpkg gdaladdo -r cubic D:\Ortho_1972\1972.gpkg 4 16 64 256 “’

Resources

Name Format Description Link
0 https://www.data.gouv.fr/api/1/datasets/r/8c207f9c-068e-497d-a751-6d4f39cfaeb4

Tags

  • photo-aerienne
  • orthophoto
  • historique
  • calvados

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