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Update neighbors function across International Date Line #150

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Update neighbors function across International Date Line #150

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11 changes: 8 additions & 3 deletions mercantile/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -326,13 +326,18 @@ def neighbors(*tile, **kwargs):

for i in [-1, 0, 1]:
for j in [-1, 0, 1]:
n_xtile, n_ytile = xtile + i, ytile + j
if i == 0 and j == 0:
continue
elif xtile + i < 0 or ytile + j < 0:
elif n_ytile < 0:
continue
elif xtile + i > hi or ytile + j > hi:
elif n_ytile > hi:
continue
tiles.append(Tile(x=xtile + i, y=ytile + j, z=ztile))
elif n_xtile < 0:
n_xtile = hi
elif n_xtile > hi:
n_xtile = 0
tiles.append(Tile(x=n_xtile, y=n_ytile, z=ztile))

# Make sure to not generate invalid tiles for valid input
# https://github.com/mapbox/mercantile/issues/122
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