python - Matplotlib 极坐标图未绘制在应有的位置

Question

我尝试在极坐标图中表示球坐标方位角和仰角(以度为单位)。我有一组值来测试 0、90、180 和 270 度，可以清楚地看到它们没有绘制在应有的方位角值处。

代码:

from matplotlib.pyplot import rc, grid, figure, plot, rcParams, savefig


def generate_satellite_plot(observer_lat, observer_lon):
    rc('grid', color='#316931', linewidth=1, linestyle='-')
    rc('xtick', labelsize=15)
    rc('ytick', labelsize=15)

    # force square figure and square axes looks better for polar, IMO
    width, height = rcParams['figure.figsize']
    size = min(width, height)
    # make a square figure
    fig = figure(figsize=(size, size))

    ax = fig.add_axes([0.1, 0.1, 0.8, 0.8], polar=True, axisbg='#d5de9c')
    ax.set_theta_zero_location('N')
    ax.set_theta_direction(-1)

    sat_positions = [[1, 30, 0], [2, 60, 90], [3, 30, 180], [4, 50, 270]]
    for (PRN, E, Az) in sat_positions:
        ax.annotate(str(PRN),
                    xy=(Az, 90-E),  # theta, radius
                    bbox=dict(boxstyle="round", fc = 'green', alpha = 0.5),
                    horizontalalignment='center',
                    verticalalignment='bottom')


    ax.set_yticks(range(0, 90, 10))                   # Define the yticks
    yLabel = ['90', '', '', '60', '', '', '30', '', '', '']
    ax.set_yticklabels(yLabel)
    grid(True)

    savefig('foo.png')

这就是结果，显然不精确:

我更改了轴，使它们从 0 度开始，然后顺时针旋转，半径表示高程(从圆中心的 90° 到边界的 0°)。

Answer 1

迟到了，但是:

代码:

from matplotlib.pyplot import rc, grid, figure, plot, rcParams, savefig
from math import radians

def generate_satellite_plot(observer_lat, observer_lon):
    rc('grid', color='#316931', linewidth=1, linestyle='-')
    rc('xtick', labelsize=15)
    rc('ytick', labelsize=15)

    # force square figure and square axes looks better for polar, IMO
    width, height = rcParams['figure.figsize']
    size = min(width, height)
    # make a square figure
    fig = figure(figsize=(size, size))

    ax = fig.add_axes([0.1, 0.1, 0.8, 0.8], polar=True, axisbg='#d5de9c')
    ax.set_theta_zero_location('N')
    ax.set_theta_direction(-1)

    sat_positions = [[1, 30, 0], [2, 60, 90], [3, 30, 180], [4, 50, 270]]
    for (PRN, E, Az) in sat_positions:
        ax.annotate(str(PRN),
                    xy=(radians(Az), 90-E),  # theta, radius
                    bbox=dict(boxstyle="round", fc = 'green', alpha = 0.5),
                    horizontalalignment='center',
                    verticalalignment='center')


    ax.set_yticks(range(0, 90+10, 10))                   # Define the yticks
    yLabel = ['90', '', '', '60', '', '', '30', '', '', '']
    ax.set_yticklabels(yLabel)
    grid(True)

    savefig('foo.png')

结果: