RHI shift

[Yogesh Kolte]

Hello everyone,

                      I am using Py-ART to read .Nc data file. I am able to read .Nc file and plot it.

My radar altitude is 1297m from sea level.Making  RHI plot using  py-Art,As per my understanding  py-Art program consider radar altitude is at 0m and generating plot therefore Bright Band appears at lower height.so how can i add altitude in RHI plot and shift image by 1297m up.

please go through attached image.

Thank you,

yogesh kolte

[Jonathan Helmus]

Yogesh,

    Offsetting a RHI plot is not directly supported in Py-ART but you can add a second axis to the plot which has the next scale.  For example:

import matplotlib.pyplot as plt
import pyart
import netCDF4

filename = 'XSW110520113537.RAW7HHL'

# create the plot using RadarDisplay
radar = pyart.io.read(filename)
display = pyart.graph.RadarDisplay(radar)

min_height_above_radar = 0   # in km
max_height_above_radar = 17  # in km
fig = plt.figure(figsize=[10, 4])
ax = fig.add_subplot(111)
display.plot('reflectivity', 0, vmin=-32, vmax=64,
             title='Offset', colorbar_flag=False, ax=ax)
display.set_limits(ylim=[min_height_above_radar, max_height_above_radar])

ax2 = ax.twinx()
radar_height = 11.12  # height of radar in kilometers
ax2.set_ylim(radar_height + min_height_above_radar, radar_height + max_height_above_radar)
ax2.set_ylabel('Distance Above Ground (km)')

plt.show()

This produces the attached figure which has a second scale on the right side which measures the height above the ground.

Cheers,

    - Jonathan Helmus

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[Joe Zagrodnik]

Hi,

Just chiming in that I would like to see this feature added in a future version. I am trying to make a plot with two different radars making RHI scans but one radar is at 150 km higher elevation than the other. 

-Joe Z.