Plotting an NECDF file using xarray results in the correct orientation, but plotting it with Plotly Express causes it to be upside down

[alexandre]

Plotting with ‘plotly.express’ is upside down. With xarray, it is plotting correctly. Is the problem with the file? I appreciate your help.

nc file here: BR-DWGD/exemplos/test_plotly.nc at main · AlexandreCandidoXavier/BR-DWGD · GitHub

import plotly.express as px
import xarray as xr
import plotly.io as pio
pio.renderers.default = "browser"

tmax = xr.open_mfdataset("test_plotly.nc")

# work correct
tmax['Tmax'].plot()

# does not work correct
fig = px.imshow(tmax['Tmax'], aspect='equal')
fig.show()

Results:

[AIMPED]

Hey @alexandre welcome to the forums.

Your data is fine, px.imshow() has this as it’s default behaviour. You can either use the origin parameter of px.imshow() or use go.Heatmap()

See also:

Inverted image in go.Image vs go.Heatmap?

Yes, go.Heatmap() inverts the y-axis. Instead of go.Heatmap() you could use px.imshow() which has the parameter origin which alters this behaviour. I don’t know EDIT: Quite helpful SO post:

[alexandre]

It’s working fine. Thanks!