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【附代码】气象科研绘图必备:Python colorbar总结

  • 2026-03-09 16:48:52
【附代码】气象科研绘图必备:Python colorbar总结

unsetunset导览unsetunset

总结常用的几种colorbar设置,可以应对很多气象论文绘图需求,包括:

  • Matplotlib Colormaps
  • 色标美化函数
  • 0值左右不对称的色标
  • 0值左右不等间距的色标
  • 正负对称色标(0值左右为白色)
  • 自定义colormap
  • 离散的colormap

Matplotlib Colormaps

matplotlib colormaps(https://matplotlib.org/stable/users/explain/colors/colormaps.html)官网:

色标美化

以某年气温距平为例,对称色标:

import matplotlib.pyplot as pltcmap = plt.cm.RdBu_rnorm = None #使用默认的线性归一化levels = np.arange(-14,14.1,2)

主要绘图函数:

def draw_info(fig,axes,data_sets,X_axis,Y_axis,levels_np,cmap = plt.cm.RdBu_r,norm=None): #X_axis,Y_axis就是lon lat#去掉白线(在世界地图的范围时)    from cartopy.util import add_cyclic_point# 遍历数据集for ax, data_var in data_sets:# 对 var 进行 add_cyclic_point 操作        cycle_var, cycle_lon = add_cyclic_point(data_var, coord=X_axis)        cycle_LON, cycle_LAT = np.meshgrid(cycle_lon, Y_axis)        c_var = ax.contourf(cycle_LON, cycle_LAT, cycle_var, zorder=0, alpha=1,  extend='both',levels = levels_np,                              transform=ccrs.PlateCarree(), cmap=cmap,norm=norm)return c_var,fig,axes

colorbar美化函数:

def draw_colorbar(c_var,levels_np,fig,axes,position_list=[0.2, 0.05, 0.6, 0.04],unit=None):    position = fig.add_axes(position_list)    cbar = fig.colorbar(c_var,cax=position,orientation='horizontal',                       drawedges=True, extendrect=True, extendfrac='auto',                       extend='both', ticks=levels_np)'''    drawedges=True   # 显示色标分级边界(每个格子之间有线)    extendrect=True  # 色标两端扩展部分为矩形    extendfrac='auto'# 自动设置色标两端扩展的长度    extend='both'    # 两端显示超出范围的扩展    ticks=levels_np  # 设置色标刻度    '''    cbar.outline.set_linewidth(0.8) # 设置色标边框线宽度     cbar.ax.tick_params(labelsize=10) #设置色标刻度字体大小    cbar.set_label(unit, fontsize=10) #设置单位return fig,axes

如果要反转色标颜色,就删除原来的“_r”:

cmap = plt.cm.RdBu #红→蓝

0值左右不对称的色标

想要将原来的对称色标修改为不对称的,就修改norm参数,用TwoSlopeNorm:以一个中心值vcenter为分界点,分别对左右两侧数据做线性映射到colormap。

from matplotlib.colors import TwoSlopeNormnorm = TwoSlopeNorm(            vmin=-14,            vcenter=0,            vmax=6        )levels = np.arange(-14, 6.1, 2)

0值左右不等间距的色标

修改levels参数,把负值和正值间距设置为不相等的。

from matplotlib.colors import TwoSlopeNormnorm = TwoSlopeNorm(            vmin=-14,            vcenter=0,            vmax=4        )neg_levels = np.arange(-14, 0, 2)      # 负数间隔 2pos_levels = np.arange(0, 4.1, 1)    # 正数间隔 1levels = np.concatenate([neg_levels, pos_levels])

设置对称色标0值左右为白色

在matplotlib色标的基础上进行修改,得到:

    base_cmap = plt.cm.RdBu_r    levels = np.arange(-14,14.1,2)# 根据levels生成对应数量的颜色    ncolor = len(levels) - 1    colors = base_cmap(np.linspace(0,1,ncolor))# 找到最接近0的位置    zero_idx = np.argmin(np.abs(levels))# 将0附近设为白色    colors[zero_idx-1:zero_idx+1] = [1,1,1,1]    cmap = LinearSegmentedColormap.from_list("RdBu_white",        colors,        N=ncolor    )    norm = None

自定义colormap

调用LinearSegmentedColormap类,可以指定几个关键颜色,然后matplotlib会在这些颜色之间做线性渐变,生成完整的色标。

colors = ['#0d4472','#6aa5e5','white','white','#e25858','#6d0e0e']positions = [0,0.2,0.455,0.545,0.8,1.0]cmap = LinearSegmentedColormap.from_list("custom_cmap",    list(zip(positions, colors)))norm = Nonelevels = np.arange(-14,14.1,2)

一个好用的调色板网站(https://www.codeeeee.com/color/picker.html)方便选择颜色

离散的colormap

调用BoundaryNorm,用不同颜色区分范围。

    import numpy as np    import matplotlib.pyplot as plt    from matplotlib.colors import ListedColormap, BoundaryNorm# ===============================# 1. 自定义颜色与区间# ===============================    colors = ['blue''green''white''pink''orange']    bounds = [-15, -10, -5, 0, 5, 10]  # 区间边界,长度 = len(colors)+1    cmap = ListedColormap(colors)    norm = BoundaryNorm(bounds, cmap.N)# ===============================# 2. 模拟数据# ===============================    lon = np.linspace(0, 360, 100)    lat = np.linspace(-90, 90, 60)    lon2, lat2 = np.meshgrid(lon, lat)# 示例数据    base_data = 10 * np.sin(np.deg2rad(lat2)) * np.cos(np.deg2rad(lon2 / 2))# 添加小幅随机扰动,让数据不完全规则    noise = np.random.uniform(-5, 5, size=base_data.shape)    data = base_data + noise  # 最终数据# ===============================# 3. 绘制 contourf# ===============================    fig, ax = plt.subplots(figsize=(10,5))    cf = ax.contourf(        lon2,        lat2,        data,        levels=bounds,   # 使用 bounds 来定义区间        cmap=cmap,        norm=norm,        extend='both'# 两端超出范围显示 extend    )    ax.set_xlabel("Longitude")    ax.set_ylabel("Latitude")    ax.set_title("BoundaryNorm Example")# ===============================# 4. 添加 colorbar(带 drawedges, extendrect, extendfrac)# ===============================    cbar = fig.colorbar(        cf,        orientation='horizontal',        extend='both',        drawedges=True,        extendrect=True,        extendfrac='auto',        boundaries=bounds,        ticks=bounds    )    cbar.set_label("Value")    cbar.ax.tick_params(labelsize=10)    plt.show()

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  1. CONNECT:[ UseTime:0.000384s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000745s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000347s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000294s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000498s ]
  6. SELECT * FROM `set` [ RunTime:0.000192s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000568s ]
  8. SELECT * FROM `article` WHERE `id` = 479067 LIMIT 1 [ RunTime:0.000904s ]
  9. UPDATE `article` SET `lasttime` = 1774588112 WHERE `id` = 479067 [ RunTime:0.000719s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001354s ]
  11. SELECT * FROM `article` WHERE `id` < 479067 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005281s ]
  12. SELECT * FROM `article` WHERE `id` > 479067 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002341s ]
  13. SELECT * FROM `article` WHERE `id` < 479067 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012296s ]
  14. SELECT * FROM `article` WHERE `id` < 479067 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006974s ]
  15. SELECT * FROM `article` WHERE `id` < 479067 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010306s ]
0.111697s