Python show corresponding profile upon hovering/clicking over a grid
I have a 2D array value_1
which depends on lon
(longitude) and lat
(latitude).
Now, I can use pcolormesh
to plot the value on one figure.
But, I have another 3D array value_2
which depends on lon
, lat
and pressure
(levels of pressure).
If I want to show the profile (depends on value_2
and pressure
) and coordinate like this: (-120,20)
when the mouse hover or click on one grid(lon,lat), how could I make it?
Here's the example of plotting pseudocolor plot
and profile plot
:
import numpy as np
import matplotlib.pyplot as plt
# coordination
lon = np.arange(-120,-110,1)
lat = np.arange(20,30,1)
# shape of value_1: (lon,lat)
# pseudocolor plot
value_1 = np.random.rand(9,9)
pressure = np.arange(1110,500,-100)
lon,lat = np.meshgrid(lon,lat)
plt.pcolormesh(lon,lat,value_1)
plt.colorbar()
plt.show()
# shape of value_2: (lon,lat,pressure)
# profile plot
# Used to plot profile when mouse hovers on one grid
value_2 = np.random.rand(9,9,pressure.shape[0])
python matplotlib
add a comment |
I have a 2D array value_1
which depends on lon
(longitude) and lat
(latitude).
Now, I can use pcolormesh
to plot the value on one figure.
But, I have another 3D array value_2
which depends on lon
, lat
and pressure
(levels of pressure).
If I want to show the profile (depends on value_2
and pressure
) and coordinate like this: (-120,20)
when the mouse hover or click on one grid(lon,lat), how could I make it?
Here's the example of plotting pseudocolor plot
and profile plot
:
import numpy as np
import matplotlib.pyplot as plt
# coordination
lon = np.arange(-120,-110,1)
lat = np.arange(20,30,1)
# shape of value_1: (lon,lat)
# pseudocolor plot
value_1 = np.random.rand(9,9)
pressure = np.arange(1110,500,-100)
lon,lat = np.meshgrid(lon,lat)
plt.pcolormesh(lon,lat,value_1)
plt.colorbar()
plt.show()
# shape of value_2: (lon,lat,pressure)
# profile plot
# Used to plot profile when mouse hovers on one grid
value_2 = np.random.rand(9,9,pressure.shape[0])
python matplotlib
add a comment |
I have a 2D array value_1
which depends on lon
(longitude) and lat
(latitude).
Now, I can use pcolormesh
to plot the value on one figure.
But, I have another 3D array value_2
which depends on lon
, lat
and pressure
(levels of pressure).
If I want to show the profile (depends on value_2
and pressure
) and coordinate like this: (-120,20)
when the mouse hover or click on one grid(lon,lat), how could I make it?
Here's the example of plotting pseudocolor plot
and profile plot
:
import numpy as np
import matplotlib.pyplot as plt
# coordination
lon = np.arange(-120,-110,1)
lat = np.arange(20,30,1)
# shape of value_1: (lon,lat)
# pseudocolor plot
value_1 = np.random.rand(9,9)
pressure = np.arange(1110,500,-100)
lon,lat = np.meshgrid(lon,lat)
plt.pcolormesh(lon,lat,value_1)
plt.colorbar()
plt.show()
# shape of value_2: (lon,lat,pressure)
# profile plot
# Used to plot profile when mouse hovers on one grid
value_2 = np.random.rand(9,9,pressure.shape[0])
python matplotlib
I have a 2D array value_1
which depends on lon
(longitude) and lat
(latitude).
Now, I can use pcolormesh
to plot the value on one figure.
But, I have another 3D array value_2
which depends on lon
, lat
and pressure
(levels of pressure).
If I want to show the profile (depends on value_2
and pressure
) and coordinate like this: (-120,20)
when the mouse hover or click on one grid(lon,lat), how could I make it?
Here's the example of plotting pseudocolor plot
and profile plot
:
import numpy as np
import matplotlib.pyplot as plt
# coordination
lon = np.arange(-120,-110,1)
lat = np.arange(20,30,1)
# shape of value_1: (lon,lat)
# pseudocolor plot
value_1 = np.random.rand(9,9)
pressure = np.arange(1110,500,-100)
lon,lat = np.meshgrid(lon,lat)
plt.pcolormesh(lon,lat,value_1)
plt.colorbar()
plt.show()
# shape of value_2: (lon,lat,pressure)
# profile plot
# Used to plot profile when mouse hovers on one grid
value_2 = np.random.rand(9,9,pressure.shape[0])
python matplotlib
python matplotlib
asked Nov 23 '18 at 12:24
Xin ZhangXin Zhang
59311
59311
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
I'm sure there a more efficient way to get the right indices when hovering over the pcolormesh, but this does the trick:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.gridspec as gs
from math import floor
# coordination
lon = np.arange(-120, -110, 1)
lat = np.arange(20, 30, 1)
# shape of value_1: (lon,lat)
# pseudocolor plot
value_1 = np.random.rand(9, 9)
pressure = np.arange(1110, 500, -100)
mlon, mlat = np.meshgrid(lon, lat)
# shape of value_2: (lon,lat,pressure)
# profile plot
# Used to plot profile when mouse hovers on one grid
value_2 = np.random.rand(9, 9, pressure.shape[0])
# global variables to keep track of which values
# are currently plotted in ax2
current_lat, curret_lon = None, None
fig, (ax1, ax2) = plt.subplots(2,1)
m = ax1.pcolormesh(mlon, mlat, value_1)
fig.colorbar(m, ax=ax1)
fig.tight_layout()
def on_move(event):
global current_lat, current_lon
if event.inaxes is ax1:
event_lat = floor(event.ydata)
event_lon = floor(event.xdata)
# find the indices corresponding to lat,lon
id_lat = np.searchsorted(lat, event_lat)
id_lon = np.searchsorted(lon, event_lon)
# only plot if we have different values than the previous plot
if id_lat != current_lat or id_lon != current_lon:
current_lat = id_lat
current_lon = id_lon
ax2.cla()
ax2.plot(value_2[id_lat, id_lon, :], pressure)
ax2.set_title("lat: {:.0f}, lon: {:.0f}".format(event_lat, event_lon))
fig.canvas.draw_idle()
cid = fig.canvas.mpl_connect('motion_notify_event', on_move)
plt.show()
Thank you! It works! But, 1. if the length oflon
andlat
are both3000
. It will be slower. 2. When zooming in, the profile won't change anymore.
– Xin Zhang
Nov 23 '18 at 14:32
To make it somewhat faster, you could replace the "motion_notify_event" by a "button_release_event", that way the calculations are only performed when you click, instead of everytime the mouse moves. About the zoom, I don't know what you mean. The code still works fine if I zoom in on the top axes on my computer
– Diziet Asahi
Nov 23 '18 at 14:55
Oh, I see .... Because you usefloor
which results in integer, there's no change when mouse moves in the integer . Thank you!
– Xin Zhang
Nov 23 '18 at 15:06
If lon and lat are irregular decimals, it seems hard to make it work.
– Xin Zhang
Nov 23 '18 at 15:26
@Diziet Asahi this is a perfect example of how to handle events. Saving for later.
– Guimoute
Nov 23 '18 at 16:09
|
show 1 more comment
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I'm sure there a more efficient way to get the right indices when hovering over the pcolormesh, but this does the trick:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.gridspec as gs
from math import floor
# coordination
lon = np.arange(-120, -110, 1)
lat = np.arange(20, 30, 1)
# shape of value_1: (lon,lat)
# pseudocolor plot
value_1 = np.random.rand(9, 9)
pressure = np.arange(1110, 500, -100)
mlon, mlat = np.meshgrid(lon, lat)
# shape of value_2: (lon,lat,pressure)
# profile plot
# Used to plot profile when mouse hovers on one grid
value_2 = np.random.rand(9, 9, pressure.shape[0])
# global variables to keep track of which values
# are currently plotted in ax2
current_lat, curret_lon = None, None
fig, (ax1, ax2) = plt.subplots(2,1)
m = ax1.pcolormesh(mlon, mlat, value_1)
fig.colorbar(m, ax=ax1)
fig.tight_layout()
def on_move(event):
global current_lat, current_lon
if event.inaxes is ax1:
event_lat = floor(event.ydata)
event_lon = floor(event.xdata)
# find the indices corresponding to lat,lon
id_lat = np.searchsorted(lat, event_lat)
id_lon = np.searchsorted(lon, event_lon)
# only plot if we have different values than the previous plot
if id_lat != current_lat or id_lon != current_lon:
current_lat = id_lat
current_lon = id_lon
ax2.cla()
ax2.plot(value_2[id_lat, id_lon, :], pressure)
ax2.set_title("lat: {:.0f}, lon: {:.0f}".format(event_lat, event_lon))
fig.canvas.draw_idle()
cid = fig.canvas.mpl_connect('motion_notify_event', on_move)
plt.show()
Thank you! It works! But, 1. if the length oflon
andlat
are both3000
. It will be slower. 2. When zooming in, the profile won't change anymore.
– Xin Zhang
Nov 23 '18 at 14:32
To make it somewhat faster, you could replace the "motion_notify_event" by a "button_release_event", that way the calculations are only performed when you click, instead of everytime the mouse moves. About the zoom, I don't know what you mean. The code still works fine if I zoom in on the top axes on my computer
– Diziet Asahi
Nov 23 '18 at 14:55
Oh, I see .... Because you usefloor
which results in integer, there's no change when mouse moves in the integer . Thank you!
– Xin Zhang
Nov 23 '18 at 15:06
If lon and lat are irregular decimals, it seems hard to make it work.
– Xin Zhang
Nov 23 '18 at 15:26
@Diziet Asahi this is a perfect example of how to handle events. Saving for later.
– Guimoute
Nov 23 '18 at 16:09
|
show 1 more comment
I'm sure there a more efficient way to get the right indices when hovering over the pcolormesh, but this does the trick:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.gridspec as gs
from math import floor
# coordination
lon = np.arange(-120, -110, 1)
lat = np.arange(20, 30, 1)
# shape of value_1: (lon,lat)
# pseudocolor plot
value_1 = np.random.rand(9, 9)
pressure = np.arange(1110, 500, -100)
mlon, mlat = np.meshgrid(lon, lat)
# shape of value_2: (lon,lat,pressure)
# profile plot
# Used to plot profile when mouse hovers on one grid
value_2 = np.random.rand(9, 9, pressure.shape[0])
# global variables to keep track of which values
# are currently plotted in ax2
current_lat, curret_lon = None, None
fig, (ax1, ax2) = plt.subplots(2,1)
m = ax1.pcolormesh(mlon, mlat, value_1)
fig.colorbar(m, ax=ax1)
fig.tight_layout()
def on_move(event):
global current_lat, current_lon
if event.inaxes is ax1:
event_lat = floor(event.ydata)
event_lon = floor(event.xdata)
# find the indices corresponding to lat,lon
id_lat = np.searchsorted(lat, event_lat)
id_lon = np.searchsorted(lon, event_lon)
# only plot if we have different values than the previous plot
if id_lat != current_lat or id_lon != current_lon:
current_lat = id_lat
current_lon = id_lon
ax2.cla()
ax2.plot(value_2[id_lat, id_lon, :], pressure)
ax2.set_title("lat: {:.0f}, lon: {:.0f}".format(event_lat, event_lon))
fig.canvas.draw_idle()
cid = fig.canvas.mpl_connect('motion_notify_event', on_move)
plt.show()
Thank you! It works! But, 1. if the length oflon
andlat
are both3000
. It will be slower. 2. When zooming in, the profile won't change anymore.
– Xin Zhang
Nov 23 '18 at 14:32
To make it somewhat faster, you could replace the "motion_notify_event" by a "button_release_event", that way the calculations are only performed when you click, instead of everytime the mouse moves. About the zoom, I don't know what you mean. The code still works fine if I zoom in on the top axes on my computer
– Diziet Asahi
Nov 23 '18 at 14:55
Oh, I see .... Because you usefloor
which results in integer, there's no change when mouse moves in the integer . Thank you!
– Xin Zhang
Nov 23 '18 at 15:06
If lon and lat are irregular decimals, it seems hard to make it work.
– Xin Zhang
Nov 23 '18 at 15:26
@Diziet Asahi this is a perfect example of how to handle events. Saving for later.
– Guimoute
Nov 23 '18 at 16:09
|
show 1 more comment
I'm sure there a more efficient way to get the right indices when hovering over the pcolormesh, but this does the trick:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.gridspec as gs
from math import floor
# coordination
lon = np.arange(-120, -110, 1)
lat = np.arange(20, 30, 1)
# shape of value_1: (lon,lat)
# pseudocolor plot
value_1 = np.random.rand(9, 9)
pressure = np.arange(1110, 500, -100)
mlon, mlat = np.meshgrid(lon, lat)
# shape of value_2: (lon,lat,pressure)
# profile plot
# Used to plot profile when mouse hovers on one grid
value_2 = np.random.rand(9, 9, pressure.shape[0])
# global variables to keep track of which values
# are currently plotted in ax2
current_lat, curret_lon = None, None
fig, (ax1, ax2) = plt.subplots(2,1)
m = ax1.pcolormesh(mlon, mlat, value_1)
fig.colorbar(m, ax=ax1)
fig.tight_layout()
def on_move(event):
global current_lat, current_lon
if event.inaxes is ax1:
event_lat = floor(event.ydata)
event_lon = floor(event.xdata)
# find the indices corresponding to lat,lon
id_lat = np.searchsorted(lat, event_lat)
id_lon = np.searchsorted(lon, event_lon)
# only plot if we have different values than the previous plot
if id_lat != current_lat or id_lon != current_lon:
current_lat = id_lat
current_lon = id_lon
ax2.cla()
ax2.plot(value_2[id_lat, id_lon, :], pressure)
ax2.set_title("lat: {:.0f}, lon: {:.0f}".format(event_lat, event_lon))
fig.canvas.draw_idle()
cid = fig.canvas.mpl_connect('motion_notify_event', on_move)
plt.show()
I'm sure there a more efficient way to get the right indices when hovering over the pcolormesh, but this does the trick:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.gridspec as gs
from math import floor
# coordination
lon = np.arange(-120, -110, 1)
lat = np.arange(20, 30, 1)
# shape of value_1: (lon,lat)
# pseudocolor plot
value_1 = np.random.rand(9, 9)
pressure = np.arange(1110, 500, -100)
mlon, mlat = np.meshgrid(lon, lat)
# shape of value_2: (lon,lat,pressure)
# profile plot
# Used to plot profile when mouse hovers on one grid
value_2 = np.random.rand(9, 9, pressure.shape[0])
# global variables to keep track of which values
# are currently plotted in ax2
current_lat, curret_lon = None, None
fig, (ax1, ax2) = plt.subplots(2,1)
m = ax1.pcolormesh(mlon, mlat, value_1)
fig.colorbar(m, ax=ax1)
fig.tight_layout()
def on_move(event):
global current_lat, current_lon
if event.inaxes is ax1:
event_lat = floor(event.ydata)
event_lon = floor(event.xdata)
# find the indices corresponding to lat,lon
id_lat = np.searchsorted(lat, event_lat)
id_lon = np.searchsorted(lon, event_lon)
# only plot if we have different values than the previous plot
if id_lat != current_lat or id_lon != current_lon:
current_lat = id_lat
current_lon = id_lon
ax2.cla()
ax2.plot(value_2[id_lat, id_lon, :], pressure)
ax2.set_title("lat: {:.0f}, lon: {:.0f}".format(event_lat, event_lon))
fig.canvas.draw_idle()
cid = fig.canvas.mpl_connect('motion_notify_event', on_move)
plt.show()
edited Nov 23 '18 at 14:10
answered Nov 23 '18 at 13:43
Diziet AsahiDiziet Asahi
9,14331731
9,14331731
Thank you! It works! But, 1. if the length oflon
andlat
are both3000
. It will be slower. 2. When zooming in, the profile won't change anymore.
– Xin Zhang
Nov 23 '18 at 14:32
To make it somewhat faster, you could replace the "motion_notify_event" by a "button_release_event", that way the calculations are only performed when you click, instead of everytime the mouse moves. About the zoom, I don't know what you mean. The code still works fine if I zoom in on the top axes on my computer
– Diziet Asahi
Nov 23 '18 at 14:55
Oh, I see .... Because you usefloor
which results in integer, there's no change when mouse moves in the integer . Thank you!
– Xin Zhang
Nov 23 '18 at 15:06
If lon and lat are irregular decimals, it seems hard to make it work.
– Xin Zhang
Nov 23 '18 at 15:26
@Diziet Asahi this is a perfect example of how to handle events. Saving for later.
– Guimoute
Nov 23 '18 at 16:09
|
show 1 more comment
Thank you! It works! But, 1. if the length oflon
andlat
are both3000
. It will be slower. 2. When zooming in, the profile won't change anymore.
– Xin Zhang
Nov 23 '18 at 14:32
To make it somewhat faster, you could replace the "motion_notify_event" by a "button_release_event", that way the calculations are only performed when you click, instead of everytime the mouse moves. About the zoom, I don't know what you mean. The code still works fine if I zoom in on the top axes on my computer
– Diziet Asahi
Nov 23 '18 at 14:55
Oh, I see .... Because you usefloor
which results in integer, there's no change when mouse moves in the integer . Thank you!
– Xin Zhang
Nov 23 '18 at 15:06
If lon and lat are irregular decimals, it seems hard to make it work.
– Xin Zhang
Nov 23 '18 at 15:26
@Diziet Asahi this is a perfect example of how to handle events. Saving for later.
– Guimoute
Nov 23 '18 at 16:09
Thank you! It works! But, 1. if the length of
lon
and lat
are both 3000
. It will be slower. 2. When zooming in, the profile won't change anymore.– Xin Zhang
Nov 23 '18 at 14:32
Thank you! It works! But, 1. if the length of
lon
and lat
are both 3000
. It will be slower. 2. When zooming in, the profile won't change anymore.– Xin Zhang
Nov 23 '18 at 14:32
To make it somewhat faster, you could replace the "motion_notify_event" by a "button_release_event", that way the calculations are only performed when you click, instead of everytime the mouse moves. About the zoom, I don't know what you mean. The code still works fine if I zoom in on the top axes on my computer
– Diziet Asahi
Nov 23 '18 at 14:55
To make it somewhat faster, you could replace the "motion_notify_event" by a "button_release_event", that way the calculations are only performed when you click, instead of everytime the mouse moves. About the zoom, I don't know what you mean. The code still works fine if I zoom in on the top axes on my computer
– Diziet Asahi
Nov 23 '18 at 14:55
Oh, I see .... Because you use
floor
which results in integer, there's no change when mouse moves in the integer . Thank you!– Xin Zhang
Nov 23 '18 at 15:06
Oh, I see .... Because you use
floor
which results in integer, there's no change when mouse moves in the integer . Thank you!– Xin Zhang
Nov 23 '18 at 15:06
If lon and lat are irregular decimals, it seems hard to make it work.
– Xin Zhang
Nov 23 '18 at 15:26
If lon and lat are irregular decimals, it seems hard to make it work.
– Xin Zhang
Nov 23 '18 at 15:26
@Diziet Asahi this is a perfect example of how to handle events. Saving for later.
– Guimoute
Nov 23 '18 at 16:09
@Diziet Asahi this is a perfect example of how to handle events. Saving for later.
– Guimoute
Nov 23 '18 at 16:09
|
show 1 more comment
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