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Add blockmedian and surface gallery example - #4771

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Aayush7788 wants to merge 3 commits into
GenericMappingTools:mainfrom
Aayush7788:docs-blockmedian-surface
Open

Add blockmedian and surface gallery example#4771
Aayush7788 wants to merge 3 commits into
GenericMappingTools:mainfrom
Aayush7788:docs-blockmedian-surface

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@Aayush7788

@Aayush7788 Aayush7788 commented Jul 27, 2026

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Description of proposed changes

Adds a gallery example showing how to reduce irregular bathymetry observations
with pygmt.blockmedian before interpolating them with pygmt.surface.

The example uses the built-in bathymetry sample dataset and compares the reduced
observations with the resulting grid.

Fixes #1352

Preview: https://pygmt-dev--4771.org.readthedocs.build/en/4771/gallery/images/gridding_with_surface.html

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@seisman seisman added documentation Improvements or additions to documentation needs review This PR has higher priority and needs review. labels Jul 28, 2026
@seisman seisman added this to the 0.20.0 milestone Jul 28, 2026
Comment thread examples/gallery/images/gridding_with_surface.py Outdated
Comment thread examples/gallery/images/gridding_with_surface.py Outdated
Comment thread examples/gallery/images/gridding_with_surface.py Outdated
data=data,
region=region,
spacing=spacing,
C=True,

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It seems the -C option is not aliased in PyGMT yet. Would you like to add it in a separate PR?

Comment on lines +39 to +47
fig = pygmt.Figure()

pygmt.makecpt(cmap="gmt/geo", series=[-7500, 0, 500])

pygmt.config(
FONT_TITLE="12p",
MAP_TITLE_OFFSET="4p",
)

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Suggested change
fig = pygmt.Figure()
pygmt.makecpt(cmap="gmt/geo", series=[-7500, 0, 500])
pygmt.config(
FONT_TITLE="12p",
MAP_TITLE_OFFSET="4p",
)
fig = pygmt.Figure()
pygmt.makecpt(cmap="gmt/geo", series=[-7500, 0, 500])
pygmt.config(FONT_TITLE="12p", MAP_TITLE_OFFSET="4p")

Comment on lines +92 to +96
position=Position(
("10c", "-1.2c"),
cstype="plotcoords",
anchor="TC",
),

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Suggested change
position=Position(
("10c", "-1.2c"),
cstype="plotcoords",
anchor="TC",
),
position=Position(("10c", "-1.2c"), cstype="plotcoords", anchor="TC"),

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Gallery example to showcase blockmean/blockmedian and surface

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