maskoceans，面罩中没有海洋，也没有数据 [英] maskoceans with no ocean in mask and no data

问题描述

我想从我拥有的netcdf文件中绘制南极洲的表面海拔高度，但要遮盖海洋.因此，我使用了"maskoceans".但是，使用时，一切都是白色的.如果我看一下创建的蒙版，它到处都会写为"True"，因此它无法识别海洋表面.此外，与陆地/海洋掩码关联的创建数组为空.我不明白发生了什么.我尝试了其他底图投影，但是问题仍然相同.我也使用投影坐标.

I would like to plot the surface elevation of Antarctica from netcdf files I have, but masking the ocean. Therfore, I used "maskoceans". However, when using it, everthing is white. If I look at the created mask, it is written "True" everywhere, so it did not recognize the surface of oceans. Moreover, the created array associated to the land/ocean mask is empty. I do not understand what is happening. I have tried with other basemap projections, but the problem is still the same. I also use the projected coordinates.

我用drawlsmask进行了测试:

I made tests with drawlsmask:

1. 在不使用maskoceans的情况下，只有lon = 180°的空白空间(我有另一个问题！)充满了指定的颜色.
2. 使用Maskoceans，它可以将陆地和海洋正确地充满.

最后，我遇到的最后一个问题是，在lon = 180°处的平淡空间(一条线)仍然存在.

Finally, one last problem I have is that a bland space (a line) at lon=180° remains.

我希望有人能够为我提供帮助，并在此先感谢那些尝试这样做的人.

I hope someone will be able to help me and thank in advance those who will try to.

这是我的代码:

#!/usr/bin/python
# -*- coding: utf-8 -*-

import numpy as np
import cdms2 as cdms
import cdtime

from mpl_toolkits.basemap import Basemap,shiftgrid,maskoceans

import matplotlib.pyplot as plt

##################################################

path='/home/dryas/Sentia/data_ECHAM/T106.surf_height.nc'
var='geosp'

tstart=cdtime.comptime(1960,1,1,0,1,0)
tstop=cdtime.comptime(2013,1,1,23,59)

#Extraction
f=cdms.open(path)
var=f(var)
f.close

lat=var.getLatitude() 
lon=var.getLongitude()

timax=var.getTime()
timax.getBounds()
timax.asComponentTime()
var=var(time=(tstart,tstop))
var=var[0,:,:]
var=var.filled()

#Map
fig=plt.figure()

m=Basemap(projection='spstere',boundinglat=-60,lon_0=-180,resolution='l')

lons,lats=np.meshgrid(lon,lat)
x,y=m(lons,lats)

mdata=maskoceans(x,y,var,resolution='h',grid=1.25,inlands=True)
cs=m.contourf(x,y,mdata)

cbar=m.colorbar(cs,location='right')
cbar.set_label('surface elevation (m)')

m.drawcoastlines()
m.drawmapboundary()

m.drawparallels(np.arange(-90.,90.,10.),labels=[1,0,0,0],fontsize=10)
m.drawmeridians(np.arange(-180,180,30.),labels=[0,0,0,1],fontsize=10)

plt.title('Surface Elevation')
plt.show()

>

推荐答案

我已经解决了maskoceans的问题:

I have resolved the problem with maskoceans:

我把x，y坐标放在maskoceans中，而不是lats lons中.现在可以工作了=)

I had put the x,y coordinates in maskoceans instead of the lats lons ones. Now it works =)

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