matplotlib

Email Archive: matplotlib-users (read-only)

[Matplotlib-users] strange behavior using a mask with Basemap

From: Yeates, Mathew C (388D) <mathew.yeates@jp...> - 2010-03-25 18:38

Hi
I would expect
hgt=ma.masked_where(div == 0,hgt)
m.contourf(x,y,hgt,15,cmap=plt.cm.jet)

to produce a map complementary to the map produced by

hgt=ma.masked_where(div != 0,hgt)
m.contourf(x,y,hgt,15,cmap=plt.cm.jet)

But, this is not the case.
What am I missing?

Mathew

Thread View

Thread	Author	Date
[Matplotlib-users] strange behavior using a mask with Basemap	Yeates, Mathew C (388D) <mathew.yeates@jp...>

Re: [Matplotlib-users] strange behavior using a mask with Basemap

From: Eric Firing <efiring@ha...> - 2010-03-29 00:44

Yeates, Mathew C (388D) wrote:
> Hi
> 
> I would expect
> 
> hgt=ma.masked_where(div == 0,hgt)
> 
> m.contourf(x,y,hgt,15,cmap=plt.cm.jet)
> 
>  
> 
> to produce a map complementary to the map produced by
> 
>  
> 
> hgt=ma.masked_where(div != 0,hgt)
> 
> m.contourf(x,y,hgt,15,cmap=plt.cm.jet)
> 
>  
> 
> But, this is not the case.
> 
> What am I missing?

Basemap contourf calls mpl contourf, and mpl contourf leaves a grid box 
empty if any of its corners is masked.  Does this account for what you 
are seeing?

Eric