我试图编写一个函数,以带有颜色条的形式显示天文图像(自动与x轴相同长度)。但是我遇到了问题,因为当我尝试将刻度放在顶部时,它没有任何作用...它仍然将刻度保留在颜色条的底部(还有颜色条的y轴上的刻度)。我认为这可能是与x轴的WCS坐标有关的问题,因为当我尝试不使用投影进行操作时,它可以正常工作!
import numpy as np
import matplotlib.pyplot as plt
from astropy import wcs
from matplotlib.colors import PowerNorm
from mpl_toolkits.axes_grid1 import make_axes_locatable
from matplotlib import cm
#WCS coordinate system
w = wcs.WCS(naxis=2)
w.wcs.crpix = [23.5, 23.5]
w.wcs.cdelt = np.array([-0.0035, 0.0035])
w.wcs.crval = [266.8451, -28.151658]
w.wcs.ctype = ["RA---TAN", "DEC--TAN"]
w.wcs.set_pv([(2, 1, 45.0)])
#generate an array as image test
data = (np.arange(10000).reshape((100,100)))
#display image
fig = plt.figure()
ax = plt.gca(projection=w)
graf = ax.imshow(data, origin='lower', cmap=cm.viridis, norm=PowerNorm(1))
#colorbar
divider = make_axes_locatable(ax)
cax = divider.append_axes("top", size="5%")
cbar = fig.colorbar(graf, cax=cax, orientation='horizontal')
cax.xaxis.set_ticks_position('top')
fig.show()
谢谢!