standardize_fr.bdalti

standardize_fr.bdalti(data, *, to_file=False)

Standardize the DEM data from IGN’s ALTI Database (https://geoservices.ign.fr/bdalti):

• merge tiles

• georeference (embed CRS = 2154, standardize _FillValue, grid_mapping and time)

• replace nodata values (-99999.0) with np.nan

Parameters

data(list of) str or pathlib.Path, or variable (xarray.Dataset or xarray.DataArray)

data is usually the folder containing all the raw BDALTI tiles downloaded from IGN website. It can also be a list of filepaths or xarray variables. It can also be a single filepath or xarray variable.

to_filebool or path (str or pathlib.Path), default False

If True and if data is a path (str or pathlib.Path), the resulting dataset will be exported to the same location as data, with the name ‘BDALTIV2_stz.tif’. If to_file is a path, the resulting dataset will be exported to this specified filepath.

Returns

data_dsxarray.Dataset

Standardized DEM.

If to_file argument is used, the standardized DEM is exported to a file. If to_file = True, the standardized DEM is exported to the GeoTIFF file ‘BDALTIV2_stz.tif’.

Examples

>>> stzfr.bdalti(
    r"E:\Inputs\DEM\IGN\BDALTIV2_2-0_25M_ASC_LAMB93-IGN69", 
    to_file = True
    )
Exporting...
   _ Success: The data has been exported to the file 'E:\Inputs\DEM\IGN\BDALTIV2_2-0_25M_ASC_LAMB93-IGN69_PAYS_BASQUE\BDALTIV2_stz.tif'
<xarray.Dataset> Size: 252MB
Dimensions:      (x: 7000, y: 9000)
Coordinates:
  * x            (x) float64 56kB 3e+05 3e+05 3e+05 ... 4.75e+05 4.75e+05
  * y            (y) float64 72kB 6.4e+06 6.4e+06 ... 6.175e+06 6.175e+06
    spatial_ref  int64 8B 0
Data variables:
    elev         (y, x) float32 252MB nan nan nan nan nan ... nan nan nan nan