pythonmatplotlibshapelycartopy

Cartopy incorrectly filling outside of Shapely polygon


The Shapely polygon listed below as "mywkt" plots incorrectly in Cartopy; it fills the outside rather than the inside, despite being a valid polygon. In GIS software it plots correctly. The issue is occurring in many projections tested, including the one below. How can I correct it to fill the inside, as would be expected?

Incorrectly filled polygon

import matplotlib.pyplot as plt
import cartopy.crs as ccrs
from cartopy.feature import ShapelyFeature
import shapely
import shapely.wkt as wkt

# Main plot setup, issue occurs regardless of projection used.
fig = plt.figure(figsize=[5, 5])
crs = ccrs.NearsidePerspective(central_longitude=-100, central_latitude=65, satellite_height=6200000)
ax = fig.add_subplot(1, 1, 1, projection=crs)

# Build and plot the polygon, valid
mywkt = "POLYGON ((-66.64127406774401 63.2679483443407, -66.48652697503979 63.1988718046901, -66.4817891045834 63.1004449790526, -66.379143168922 63.0115892305586, -66.1973803825985 62.9848443902565, -66.0559008189676 62.9537393506905, -65.97118398525259 62.9850694644843, -65.850509788396 62.9360773051236, -65.69642646101229 62.9192773820456, -65.6182098640938 62.8587266887857, -65.473922680887 62.8270608886491, -65.3890303678572 62.8197557451316, -65.31233201541011 62.7191354685271, -65.25006848777041 62.6268846390149, -65.12107061571631 62.5688402034127, -64.96662902810711 62.6103134144326, -64.52292746513029 60.3009837190234, -64.678588195289 60.3290634023542, -64.7726142595404 60.3596734442741, -64.8751520004644 60.2840499669325, -64.9515074450125 60.2243558221635, -65.0198404413832 60.1228099129471, -65.095375384966 60.0444670754952, -65.1483835964257 59.944148956709, -65.2920146315699 59.8405379513654, -65.453168021487 59.7919610620534, -65.47048148623151 59.6270483926692, 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-66.5590520172367 63.0848581227043, -66.5560689390303 63.2054750444379, -66.64127406774401 63.2679483443407))"
p = shapely.geometry.Polygon(wkt.loads(mywkt))
print(p.is_valid)
shape_feature = ShapelyFeature([p], ccrs.Geodetic(), edgecolor='black', facecolor="red")
ax.add_feature(shape_feature)
plt.show()

Solution

  • The polygon does not have ccw sequence. To get it right, you need to reverse the sequence. Here is the relevant code that does the trick for you.

    # Your code is OK up to this line:
    p = shapely.geometry.Polygon(wkt.loads(mywkt))
    
    # Add these lines to reverse vertices sequence
    px = p.exterior
    if px.is_ccw==False:
        px.coords = list(px.coords)[::-1]
    
    # Continue your remaining code.
    

    Update (thanks to the comment by mintem)

    My original code above is now broken. Here is the update given as a full working code and output plot:

    import matplotlib.pyplot as plt
    import cartopy.crs as ccrs
    from cartopy.feature import ShapelyFeature
    import shapely
    import shapely.wkt as wkt
    
    # Main plot setup, issue occurs regardless of projection used.
    fig = plt.figure(figsize=[5, 5])
    crs = ccrs.NearsidePerspective(central_longitude=-100, central_latitude=65, satellite_height=6200000)
    ax = fig.add_subplot(1, 1, 1, projection=crs)
    
    # Build and plot the polygon, valid
    mywkt = "POLYGON ((-66.64127406774401 63.2679483443407, -66.48652697503979 63.1988718046901, -66.4817891045834 63.1004449790526, -66.379143168922 63.0115892305586, -66.1973803825985 62.9848443902565, -66.0559008189676 62.9537393506905, -65.97118398525259 62.9850694644843, -65.850509788396 62.9360773051236, -65.69642646101229 62.9192773820456, -65.6182098640938 62.8587266887857, -65.473922680887 62.8270608886491, -65.3890303678572 62.8197557451316, -65.31233201541011 62.7191354685271, -65.25006848777041 62.6268846390149, -65.12107061571631 62.5688402034127, -64.96662902810711 62.6103134144326, -64.52292746513029 60.3009837190234, -64.678588195289 60.3290634023542, -64.7726142595404 60.3596734442741, -64.8751520004644 60.2840499669325, -64.9515074450125 60.2243558221635, -65.0198404413832 60.1228099129471, -65.095375384966 60.0444670754952, -65.1483835964257 59.944148956709, -65.2920146315699 59.8405379513654, -65.453168021487 59.7919610620534, -65.47048148623151 59.6270483926692, 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-66.5590520172367 63.0848581227043, -66.5560689390303 63.2054750444379, -66.64127406774401 63.2679483443407))"
    p = shapely.geometry.Polygon(wkt.loads(mywkt))
    print(p.is_valid)  #true
    
    # Add these lines to reverse vertices sequence
    px = p.exterior
    if px.is_ccw==False:
        #px.coords = list(px.coords)[::-1]  #no longer allowed
        p = px.reverse()
    
    shape_feature = ShapelyFeature([p], ccrs.Geodetic(), edgecolor='black', facecolor="red")
    ax.add_feature(shape_feature)
    plt.show()
    

    fig1