Thanks Ryan!
That worked! It is one of those things that you look at it and go in circles
trying to figure out your problem. As soon as someone points it out you sit
back and say it was starring me in the face the whole time ;)
Thanks again!
Jim Weber
From: Ryan May <rmay@xxxxxxxx>
Sent: Thursday, November 18, 2021 2:53 PM
To: Weber, Jim <Jim.Weber@xxxxxxx>
Cc: python-users@xxxxxxxxxxxxxxxx
Subject: Re: [python-users] Displaying GOES in mercator projection
Hi Jim
So when you type:
ax.set_extent([-135, -60, 10, 65], crs=ccrs.Mercator())
You are telling cartopy "set the extents of the axes to a box with lower left
corner (-135, 10) and upper right corner (-60, 65); those points are native
coordinates in the Mercator() projection". You essentially specified a 75m x
55m box. To plot with Mercator you want:
# Tell cartopy the axes we're plotting on should be in Mercator
ax = fig.add_subplot(1, 1, 1, projection=Mercator())
# Specify the extent as lat/lon
ax.set_extent([-135, -60, 10, 65], crs=ccrs.PlateCarree())
Hope this helps!
Ryan
On Thu, Nov 18, 2021 at 11:54 AM Weber, Jim
<Jim.Weber@xxxxxxx<mailto:Jim.Weber@xxxxxxx>> wrote:
Below is a snippet of code from Brian Blaylock’s True Color Recipe. I am
trying to instead display imagery in a Mercator projection. I thought I would
do this with a line such as:
mc=cartopy.ccrs.Mercator(central_longitude=0.0, min_latitude=-80.0,
max_latitude=84.0, globe=None)
and then have lines:
ax = fig.add_subplot(1, 1, 1, projection=mc)
ax.set_extent([-135, -60, 10, 65], crs=ccrs.Mercator())
but this does not work. Can someone point out what I am doing wrong or point me
to the correct resource so I might understand my problem better?
Thanks, Jim
------ Code snippet ---------
fig = plt.figure(figsize=(15, 12))
# Generate an Cartopy projection
lc = ccrs.LambertConformal(central_longitude=-97.5, standard_parallels=(38.5,
38.5))
ax = fig.add_subplot(1, 1, 1, projection=lc)
ax.set_extent([-135, -60, 10, 65], crs=ccrs.PlateCarree())
ax.imshow(RGB, origin='upper',
extent=(x.min(), x.max(), y.min(), y.max()),
transform=geos,
interpolation='none')
ax.coastlines(resolution='50m', color='black', linewidth=0.5)
ax.add_feature(ccrs.cartopy.feature.STATES, linewidth=0.5)
plt.title('GOES-16 True Color', loc='left', fontweight='bold', fontsize=15)
plt.title('{}'.format(scan_start.strftime('%d %B %Y %H:%M UTC ')), loc='right')
plt.show()
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Ryan May, Ph.D.
Software Engineer
UCAR/Unidata
Boulder, CO
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