Vector plots draw an unintended constant longitude line about dateline

philipc2 commented 1 week ago

ALL software version info

Software Version Info

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4.0.10 py311hca03da5_0 wrapt 1.16.0 py311h460d6c5_1 conda-forge xarray 2024.6.0 pyhd8ed1ab_1 conda-forge xerces-c 3.2.4 h313beb8_1 xyzservices 2024.6.0 pyhd8ed1ab_0 conda-forge xz 5.4.6 h80987f9_1 yaml 0.2.5 h3422bc3_2 conda-forge yaml-cpp 0.8.0 h13dd4ca_0 conda-forge zeromq 4.3.5 h313beb8_0 zict 3.0.0 pyhd8ed1ab_0 conda-forge zipp 3.19.2 pyhd8ed1ab_0 conda-forge zlib 1.2.13 hfb2fe0b_6 conda-forge zstandard 0.22.0 py311h1a4646a_0 zstd 1.5.5 hd90d995_2 ```

Description of expected behavior and the observed behavior

I am working with a mesh of polygons that I want to project and visualize over the dateline (180 degrees longitude). I have two datasets:

Unprojected GeoDataFrame excluding elements that are on the Dateline
GeoDataFrame with elements shifted by 180 degrees.

I've put a few code examples below. For vector plots, there is line of longitude being drawn at 180 degrees, which is not observed in the rasterized plot or the un-projected one.

With the elements

Complete, minimal, self-contained example code that reproduces the issue

import hvplot.pandas
import cartopy.crs as ccrs

Shapefile of gdf_0_lon: https://drive.google.com/file/d/1i35d7tCvXOTm1EcmHsKHWn3iTHIHUNm2/view?usp=drive_link

Shapefile of gdf_180_lon: https://drive.google.com/file/d/12hYPfCbDpc0gv7ohzX_yKdxufOC1dWos/view?usp=drive_link

projection = ccrs.Orthographic(central_longitude=180)
crs = ccrs.PlateCarree()
gdf_0_lon.hvplot.paths(geo=True, crs=crs, projection=projection, global_extent=True)

projection = ccrs.Orthographic(central_longitude=180)
crs = ccrs.PlateCarree(central_longitude=180)
gdf_180_lon.hvplot.paths(geo=True, crs=crs, projection=projection, global_extent=True)

projection = ccrs.Orthographic(central_longitude=180)
crs = ccrs.PlateCarree(central_longitude=180)
gdf_180_lon.hvplot.paths(geo=True, crs=crs, projection=projection, global_extent=True, rasterize=True, dynamic=False, pixel_ratio=4.0, line_width=4, colorbar=False,)

gdf_180_lon.hvplot.paths()

Stack traceback and/or browser JavaScript console output

N/A

[x] I may be interested in making a pull request to address this

philipc2 commented 1 week ago

The same behavior is observed with geoviews

import geoviews as gv

projection = ccrs.Orthographic(central_longitude=180)
crs = ccrs.PlateCarree(central_longitude=180)

gv.Path(gdf_180_lon, crs=crs).opts(projection=projection)

ahuang11 commented 1 week ago

Can you see if matplotlib does the same?

philipc2 commented 1 week ago

Can you see if matplotlib does the same?

Same behavior.

import geoviews as gv
import holoviews as hv
hv.extension("matplotlib")

projection = ccrs.Orthographic(central_longitude=180)
crs = ccrs.PlateCarree(central_longitude=180)

gv.Path(gdf_180_lon, crs=crs).opts(projection=projection)

ahuang11 commented 1 week ago

Oh I meant pure matplotlib :P

philipc2 commented 1 week ago

Oh I meant pure matplotlib :P

Oops! Here's a Matplotlib plot using a PolyCollection. There's some UXarray logic here, though the GeoDataFrames I generated above were also from UXarray.

projection = ccrs.Orthographic(central_longitude=180)
crs = ccrs.PlateCarree(central_longitude=180)

# shift central coordinates by applying a PlateCarree at 180 degrees
pc = uxds['bottomDepth'].to_polycollection(periodic_elements="exclude", projection=crs)

pc.set_antialiased(True)
pc.set_cmap("Blues")

fig, ax = plt.subplots(
    1,
    1,
    figsize=(10, 5),
    facecolor="w",
    constrained_layout=True,
    subplot_kw=dict(projection=projection), # project using matplotlib, with source PlateCarree at 180 lon
)

ax.add_feature(cfeature.COASTLINE)
ax.add_feature(cfeature.BORDERS)

ax.add_collection(pc)
ax.set_global()

Switching subplot_kw=dict(projection=projection) to `subplot_kw=dict(projection=crs) yeilds the following:

ahuang11 commented 23 hours ago

So it seems like there's something wrong with GeoViews projecting it. Moving to geoviews.

ahuang11 commented 22 hours ago

Maybe you can poke around here and see if you can spot the issue here: https://github.com/holoviz/geoviews/blob/main/geoviews/util.py#L54-L115

philipc2 commented 20 hours ago

Maybe you can poke around here and see if you can spot the issue here: https://github.com/holoviz/geoviews/blob/main/geoviews/util.py#L54-L115

Will take a look!

holoviz / geoviews