Plotting Issues

[zzwei1]

I used the following Python2.7 script to plot data from NEXRAD.

import matplotlib.pyplot as plt import pyart import numpy as np filename = 'KTLX20160914_111932_V06' radar = pyart.io.read_nexrad_archive(filename) display = pyart.graph.RadarDisplay(radar) fig = plt.figure(figsize=(6, 5)) ax = fig.add_subplot(111)

radar = scan.open_pyart()

display = pyart.graph.RadarDisplay(radar) display.plot('reflectivity',0,ax=ax,title='NEXRAD Reflectivity',vmin=-32,vmax=64,colorbar_label='') display.plot_range_ring(radar.range['data'][-1]/1000.,ax=ax) display.set_limits((-500,500),(-500,500), ax = ax) plt.show() /home/zzwei/桌面/1.png

While my figure looks like a little strange.I don't know how to fix it.And when I import pyart from IPython console,It shows: You are using the Python ARM Radar Toolkit (Py-ART), an open source library for working with weather radar data. Py-ART is partly supported by the U.S. Department of Energy as part of the Atmospheric Radiation Measurement (ARM) Climate Research Facility, an Office of Science user facility. If you use this software to prepare a publication, please cite: JJ Helmus and SM Collis, JORS 2016, doi: 10.5334/jors.119 /home/zzwei/.local/lib/python2.7/site-packages/pyart/graph/cm.py:104: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparison if 'red' in spec: /home/zzwei/.local/lib/python2.7/site-packages/pyart/graph/cm_colorblind.py:32: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparison if 'red' in spec: /home/zzwei/anaconda2/lib/python2.7/site-packages/numpy/lib/type_check.py:546: DeprecationWarning: np.asscalar(a) is deprecated since NumPy v1.16, use a.item() instead 'a.item() instead', DeprecationWarning, stacklevel=1) /home/zzwei/anaconda2/lib/python2.7/site-packages/numpy/lib/type_check.py:546: DeprecationWarning: np.asscalar(a) is deprecated since NumPy v1.16, use a.item() instead 'a.item() instead', DeprecationWarning, stacklevel=1)

I don't know whether it is related to my issue.It doen't seem like my data is broken.

[zssherman]

@zzwei1 Hmm that is interesting. I don't see anything wrong with your plotting code, can you try a plot but set cmap='pyart_NWSRef' in the plot code? I want to see if maybe something is wrong with the colormap.

[zzwei1]

That's awesome! I have set cmap='pyart_NWSRef',and the figure seems like right. Does it mean that there's something wrong with the default colormap?

[zssherman]

@zzwei1 Sweet, yeah that helps narrow it down. I think something is wrong with the code for the default homeyer rainbow color map in pyart. I'll look into what could be causing this.

[zzwei1]

@zzwei1 Sweet, yeah that helps narrow it down. I think something is wrong with the code for the default homeyer rainbow color map in pyart. I'll look into what could be causing this.

Thank you very much!

[zssherman]

@rcjackson Do you possibly have an idea of what could be causing this in the colorblind code? I looked through the cm_colorblind code and didn't really see anything. But this issue and #747 seem to have similar issues with the colormap.

[rcjackson]

Is there an issue with float to integer conversion of the colormap? Maybe some versions of python the integer division in the loop is not functioning correctly.

[zssherman]

@rcjackson I think you might be right, I'm still trying to pinpoint the issue, but with python 3.6 instead of python 2.7, I plotted the same data but the colormap worked.

[zssherman]

856 Fixes this issue for python 2.7 users.

[zssherman]

Fixed, closing.