Read a raster using xarray

Use xarray and rasterio to load a raster into a StructuredGrid.

import numpy as np
import pooch
import pyvista as pv
from rasterio.warp import transform
import rioxarray

The following is a function you can use to load just about any geospatial raster.

def read_raster(filename, out_crs="EPSG:3857", use_z=False):
    """Read a raster to a ``pyvista.StructuredGrid``.

    This will handle coordinate transformations.
    # Read in the data
    data = rioxarray.open_rasterio(filename)
    values = np.asarray(data)
    nans = values ==
    if np.any(nans):
        # values =, values)
        values[nans] = np.nan
    # Make a mesh
    xx, yy = np.meshgrid(data["x"], data["y"])
    if use_z and values.shape[0] == 1:
        # will make z-comp the values in the file
        zz = values.reshape(xx.shape)
        # or this will make it flat
        zz = np.zeros_like(xx)
    mesh = pv.StructuredGrid(xx, yy, zz)
    pts = mesh.points
    lon, lat = transform(, out_crs, pts[:, 0], pts[:, 1])
    mesh.points[:, 0] = lon
    mesh.points[:, 1] = lat
    mesh["data"] = values.reshape(mesh.n_points, -1, order="F")
    return mesh

Download a sample GeoTiff to demonstrate

url = ""
file_path = pooch.retrieve(url=url, known_hash=None)

Use the utility function to load that file.

topo = read_raster(file_path, use_z=True)
HeaderData Arrays
N Cells8126580
N Points8132409
X Bounds-1.193e+07, -1.189e+07
Y Bounds4.702e+06, 4.732e+06
Z Bounds2.360e+03, 4.346e+03
Dimensions2311, 3519, 1
N Arrays1
NameFieldTypeN CompMinMax


Total running time of the script: ( 0 minutes 16.154 seconds)

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