Using datashade=True flips the image up-down

Description of expected behavior and the observed behavior

Using datashade=True option the plotted image is flipped up-down. Is there some bug due to datashade or I am doing something wrong. I also see the dynamic range of color changed as well.

See the two images below side-by-side, with only change being ‘datashade=True’

Here dem is any 1-band DEM

Complete, minimal, self-contained example code that reproduces the issue

dem = dems[0] 
ds =rioxarray.open_rasterio(f'{base_folder}/{dem}')
print(f'DEM: {dem}')
print(ds.shape)

asp = ds.shape[-1]/ds.shape[1]

ds.hvplot.image(x='x', y='y', aspect=asp, frame_width=250, cmap='gist_earth') + ds.hvplot.image(datashade=True, x='x', y='y', aspect=asp, frame_width=250, cmap='gist_earth')

Screenshots or screencasts of the bug in action

ALL software version info

all these libraies from conda-forge hvplot: 0.7.0
datashader 0.12.0
holoviews 1.14.1
xarray 0.16.2
rioxarray 0.1.1

[jbednar]

We’ve definitely run into flipping issues in various cases before, but not this particular one; the files we test with must all have ascending coordinates. It would be great to have a check to catch this condition and do the flipping if needed.

[jbednar]

Fixed in #1095.