coincident.io.xarray.load_ncalm_dem#

coincident.io.xarray.load_ncalm_dem(aoi, dataset_id, product, res=1, clip=True)[source]#

Load NCALM DEM (DTM or DSM) tiles directly from OpenTopography S3

Parameters:

  • aoi (GeoDataFrame) – Area of interest geometries (in EPSG:4326).

  • dataset_id (str | int) – NCALM dataset identifier (e.g., ‘WA18_Wall’).

  • product (str) – ‘dtm’ for bare-earth, ‘dsm’ for first-return.

  • res (int) – Factor to coarsen the DEM.

  • clip (bool) – Whether to clip final mosaic to the AOI.

Returns:

DEM tile arrays or merged mosaic with name ‘elevation’.

Return type:

DataArray

Notes

NCALM provides:

  • DTM (bare-earth) with file code GEG in folder suffix ‘_be’

  • DSM (first-return) with file code GEF in folder suffix ‘_hh’