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#> Linking to GEOS 3.11.2, GDAL 3.6.2, PROJ 9.2.0; sf_use_s2() is TRUE

Brief presentation

Even if almost all IGN data are available to the general public, some layers are distributed within a stricter framework of use. The SCAN 25®, SCAN 100® and SCAN OACI (and associated online services) are distributed under license conditions that can be consulted [here]( . The final use in a professional or associative context is free without exception, according to the terms of this license. The final use for the general public is free of charge up to a certain threshold, then paying, according to the appropriate general conditions. All infos can be found here.

What are they ?

How to use them with happign ?

These layers are WMS raster, so you just have to use the get_wms_raster() function with a personal apikey. To do this, you need to create an account on the geoservice site and then request a key in the “My keys” section of your account. It should look like this : “abc12efghi34j5k678lmnopq” (obviously, this is a fake key).

Then you choose the layer you want at the Web services from IGN SCANs and it’s done !

# Create or import a shape
penmarch <- get_apicarto_cadastre("29158", "commune")

my_key <- "abc12efghi34j5k678lmnopq"
scan25_name <- "SCAN25TOUR_PYR-JPEG_WLD_WM"

scan25 <- get_wms_raster(penmarch,
                         apikey = my_key,
                         layer = scan25_name,
                         res = 1,   # To have full resolution
                         filename = "SCAN25.tif") # This resource need to be downloaded on disk