在matplotlib中的绘图之间保持地图覆盖 [英] Keeping map overlay between plots in matplotlib

问题描述

我正在根据底图在地图上创建一系列纬度/经度散点图.我计划使用不同的经/纬度数据创建数千个图.为了节省时间，我只想绘制一次地图叠加层:

I am creating a series of lat/long scatterplots on a map from basemap. I am planning on creating thousands of plot, with different lat/long data. To save time I wanted to draw the map overlay only once:

map = Basemap(epsg=3395, projection='merc', lat_0=59.45, lon_0=10.5,
resolution = 'h',
llcrnrlon=minlong, llcrnrlat=minlat,
urcrnrlon=maxlong, urcrnrlat=maxlat
map.arcgisimage(service='ESRI_Imagery_World_2D', xpixels=3000, verbose=True)

但是，在绘制新散点图之前，我找不到清除散点图的方法.

However, I find no way of clearing my previous scatterplot before plotting a new one.

for each set in sets:
   x = set[0]
   y = set[1]
   x,y = map(x,y)
   plt.scatter(x,y, s=2.5, alpha=1, color=c, edgecolors='none')
   plt.savefig('title.png', format='png', bbox_inches='tight', dpi=500)

如果我执行以下操作:

plt.clf()

或

plt.close()

我必须重绘地图.如果我什么都没有，那么将绘制上一次迭代的散点图.那么，如何删除所有散点图数据，但保留地图数据呢?

I have to redraw my map. If I don't have anything, the scatter plot from the previous iteration are plotted. So how do I remove all scatterplot data, but keeping the map data?

推荐答案

仅更改散点图的数据怎么办?

What about just changing the data of your scatter plot?

# save an empty scatter plot
scat = plt.scatter([], [],  s=2.5, alpha=1, color=c, edgecolors='none')
for each set in sets:
    # The data needs to be written as [(x1, y1), (x2, y2), ...]
    scat.set_offsets([xy for xy in zip(x, y)])
    plt.savefig("...")

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