Water eats coast lines again. #47

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opened 2026-08-03 21:44:33 +00:00 by map-issues-bot · 8 comments

map-issues-bot commented 2026-08-03 21:44:33 +00:00

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I don't notice it at z6, but in the first selection, two lakes merge through a river/canal and end up being one larger lake that eats the coastline. Vänern eats even more neighbors at z4, Mälaren merges with the sea, and actually the baltic starts eating Poland too.

---

Location: z4 / 60.58628 / 0.43495
Area: circle r=33639 m @ 59.06455, 14.04222

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I don't notice it at z6, but in the first selection, two lakes merge through a river/canal and end up being one larger lake that eats the coastline. Vänern eats even more neighbors at z4, Mälaren merges with the sea, and actually the baltic starts eating Poland too. --- **Location:** [z4 / 60.58628 / 0.43495](https://experiments.blahonga.org/?map=se#4.05/60.59/0.43) **Area:** circle r=33639 m @ 59.06455, 14.04222 ```map-report { "features": [ { "geometry": { "type": "Polygon", "coordinates": [ [ [ 14.630051542243784, 59.06454696979222 ], [ 14.627220979483713, 59.09416648234078 ], [ 14.618756551070229, 59.12350074279183 ], [ 14.604739774076076, 59.15226724618149 ], [ 14.58530563772606, 59.180188955356726 ], [ 14.560641303377011, 59.206996968994645 ], [ 14.530984302051607, 59.23243311126915 ], [ 14.496620246884778, 59.25625241822534 ], [ 14.45788008251308, 59.27822549691625 ], [ 14.415136897896947, 59.2981407345824 ], [ 14.368802333270029, 59.31580633659827 ], [ 14.319322615818736, 59.33105217355946 ], [ 14.267174262270487, 59.34373141972181 ], [ 14.21285948977714, 59.35372196701359 ], [ 14.156901379289284, 59.360927601003 ], [ 14.09983883800073, 59.365278927495716 ], [ 14.042221409377646, 59.366734040838935 ], [ 13.984603980754562, 59.365278927495716 ], [ 13.927541439466008, 59.360927601003 ], [ 13.871583328978152, 59.35372196701359 ], [ 13.817268556484805, 59.34373141972181 ], [ 13.765120202936556, 59.33105217355946 ], [ 13.715640485485263, 59.31580633659827 ], [ 13.669305920858346, 59.2981407345824 ], [ 13.626562736242212, 59.27822549691625 ], [ 13.587822571870515, 59.25625241822534 ], [ 13.553458516703685, 59.23243311126915 ], [ 13.523801515378281, 59.206996968994645 ], [ 13.499137181029232, 59.180188955356726 ], [ 13.479703044679216, 59.15226724618149 ], [ 13.465686267685063, 59.12350074279183 ], [ 13.457221839271579, 59.09416648234078 ], [ 13.454391276511508, 59.06454696979222 ], [ 13.457221839271579, 59.034927457243654 ], [ 13.465686267685063, 59.0055931967926 ], [ 13.479703044679216, 58.97682669340295 ], [ 13.499137181029232, 58.94890498422771 ], [ 13.523801515378281, 58.92209697058979 ], [ 13.553458516703685, 58.896660828315284 ], [ 13.587822571870515, 58.8728415213591 ], [ 13.626562736242212, 58.85086844266819 ], [ 13.669305920858346, 58.83095320500204 ], [ 13.715640485485263, 58.813287602986165 ], [ 13.765120202936556, 58.79804176602497 ], [ 13.817268556484805, 58.78536251986262 ], [ 13.871583328978152, 58.775371972570845 ], [ 13.927541439466008, 58.76816633858144 ], [ 13.984603980754562, 58.76381501208872 ], [ 14.042221409377646, 58.7623598987455 ], [ 14.09983883800073, 58.76381501208872 ], [ 14.156901379289284, 58.76816633858144 ], [ 14.21285948977714, 58.775371972570845 ], [ 14.267174262270487, 58.78536251986262 ], [ 14.319322615818736, 58.79804176602497 ], [ 14.368802333270029, 58.813287602986165 ], [ 14.415136897896947, 58.83095320500204 ], [ 14.45788008251308, 58.85086844266819 ], [ 14.496620246884776, 58.8728415213591 ], [ 14.530984302051607, 58.896660828315284 ], [ 14.560641303377011, 58.92209697058979 ], [ 14.58530563772606, 58.94890498422771 ], [ 14.604739774076076, 58.97682669340295 ], [ 14.618756551070229, 59.0055931967926 ], [ 14.627220979483713, 59.034927457243654 ], [ 14.630051542243784, 59.06454696979222 ] ] ] }, "properties": { "_kind": "selection-circle", "_radius_m": 33639 }, "type": "Feature" } ], "properties": { "lat": 60.586281, "lng": 0.434954, "map": "se", "zoom": 4.05 }, "type": "FeatureCollection" } ```

map-issues-bot added the

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map:se

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map-issues-bot commented 2026-08-03 21:44:42 +00:00

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---

Location: z4 / 60.58628 / 0.43495
Area: circle r=74891 m @ 59.34163, 17.56724

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--- **Location:** [z4 / 60.58628 / 0.43495](https://experiments.blahonga.org/?map=se#4.05/60.59/0.43) **Area:** circle r=74891 m @ 59.34163, 17.56724 ```map-report { "features": [ { "geometry": { "type": "Polygon", "coordinates": [ [ [ 18.8865761712484, 59.34162511938871 ], [ 18.88022318141668, 59.407566749032775 ], [ 18.861225394686507, 59.47287332473601 ], [ 18.829765770129328, 59.53691590847418 ], [ 18.786147281127217, 59.599077735156655 ], [ 18.730789997573556, 59.65876015241137 ], [ 18.66422704037033, 59.715388385934425 ], [ 18.587099447182425, 59.768417074880865 ], [ 18.50014999889447, 59.8173355239877 ], [ 18.404216066224883, 59.86167262184849 ], [ 18.30022154538809, 59.90100137797371 ], [ 18.189167960468943, 59.934943034942584 ], [ 18.072124818198272, 59.96317071604411 ], [ 17.950219308018436, 59.98541257327846 ], [ 17.8246254466328, 60.00145440540183 ], [ 17.696552771583093, 60.01114172080152 ], [ 17.567234692741692, 60.014381225334596 ], [ 17.437916613900292, 60.01114172080152 ], [ 17.309843938850584, 60.00145440540183 ], [ 17.18425007746495, 59.98541257327846 ], [ 17.062344567285113, 59.96317071604411 ], [ 16.945301425014442, 59.934943034942584 ], [ 16.834247840095294, 59.90100137797371 ], [ 16.7302533192585, 59.86167262184849 ], [ 16.634319386588913, 59.8173355239877 ], [ 16.54736993830096, 59.768417074880865 ], [ 16.470242345113054, 59.715388385934425 ], [ 16.40367938790983, 59.65876015241137 ], [ 16.348322104356168, 59.599077735156655 ], [ 16.304703615354057, 59.53691590847418 ], [ 16.273243990796878, 59.47287332473601 ], [ 16.254246204066703, 59.407566749032775 ], [ 16.247893214234985, 59.34162511938871 ], [ 16.254246204066703, 59.275683489744644 ], [ 16.273243990796878, 59.21037691404141 ], [ 16.304703615354057, 59.14633433030324 ], [ 16.348322104356168, 59.08417250362076 ], [ 16.40367938790983, 59.02449008636605 ], [ 16.470242345113054, 58.967861852842994 ], [ 16.54736993830096, 58.91483316389655 ], [ 16.634319386588913, 58.86591471478972 ], [ 16.7302533192585, 58.82157761692893 ], [ 16.834247840095294, 58.78224886080371 ], [ 16.945301425014442, 58.748307203834834 ], [ 17.062344567285113, 58.72007952273331 ], [ 17.18425007746495, 58.69783766549896 ], [ 17.309843938850584, 58.68179583337559 ], [ 17.437916613900292, 58.6721085179759 ], [ 17.567234692741692, 58.66886901344282 ], [ 17.696552771583093, 58.6721085179759 ], [ 17.8246254466328, 58.68179583337559 ], [ 17.950219308018436, 58.69783766549896 ], [ 18.072124818198272, 58.72007952273331 ], [ 18.18916796046894, 58.748307203834834 ], [ 18.30022154538809, 58.78224886080371 ], [ 18.404216066224883, 58.82157761692893 ], [ 18.50014999889447, 58.86591471478972 ], [ 18.587099447182425, 58.91483316389655 ], [ 18.66422704037033, 58.967861852842994 ], [ 18.730789997573556, 59.02449008636605 ], [ 18.786147281127217, 59.08417250362076 ], [ 18.829765770129328, 59.14633433030324 ], [ 18.861225394686507, 59.21037691404141 ], [ 18.88022318141668, 59.275683489744644 ], [ 18.8865761712484, 59.34162511938871 ] ] ] }, "properties": { "_kind": "selection-circle", "_radius_m": 74891 }, "type": "Feature" } ], "properties": { "lat": 60.586281, "lng": 0.434954, "map": "se", "zoom": 4.05 }, "type": "FeatureCollection" } ```

map-issues-bot commented 2026-08-03 21:44:59 +00:00

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z4

---

Location: z4 / 60.62801 / 0.30742
Area: circle r=39495 m @ 54.15344, 15.56918

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z4 --- **Location:** [z4 / 60.62801 / 0.30742](https://experiments.blahonga.org/?map=se#4.05/60.63/0.31) **Area:** circle r=39495 m @ 54.15344, 15.56918 ```map-report { "features": [ { "geometry": { "type": "Polygon", "coordinates": [ [ [ 16.175019831443535, 54.15343882542328 ], [ 16.172102533548234, 54.18821447360014 ], [ 16.163378735035824, 54.22265521327476 ], [ 16.148932450854893, 54.256429361296846 ], [ 16.12890280661924, 54.28921165415811 ], [ 16.10348269875218, 54.32068638045768 ], [ 16.072916936788513, 54.35055042137545 ], [ 16.03749988572489, 54.37851616987205 ], [ 15.99757263112399, 54.40431430050182 ], [ 15.953519694274076, 54.42769636316409 ], [ 15.905765329038795, 54.448437175813496 ], [ 15.854769436060556, 54.466336993086145 ], [ 15.801023133665929, 54.481223429956664 ], [ 15.745044028127692, 54.49295312190023 ], [ 15.687371228833472, 54.50141310557133 ], [ 15.62856015636763, 54.50652190670252 ], [ 15.569177193507414, 54.50823032474614 ], [ 15.509794230647199, 54.50652190670252 ], [ 15.450983158181357, 54.50141310557133 ], [ 15.393310358887137, 54.49295312190023 ], [ 15.3373312533489, 54.481223429956664 ], [ 15.283584950954273, 54.466336993086145 ], [ 15.232589057976034, 54.448437175813496 ], [ 15.184834692740752, 54.42769636316409 ], [ 15.140781755890838, 54.40431430050182 ], [ 15.100854501289938, 54.37851616987205 ], [ 15.065437450226318, 54.35055042137545 ], [ 15.03487168826265, 54.32068638045768 ], [ 15.009451580395588, 54.28921165415811 ], [ 14.989421936159937, 54.256429361296846 ], [ 14.974975651979005, 54.22265521327476 ], [ 14.966251853466595, 54.18821447360014 ], [ 14.963334555571294, 54.15343882542328 ], [ 14.966251853466595, 54.11866317724642 ], [ 14.974975651979005, 54.084222437571796 ], [ 14.989421936159937, 54.05044828954971 ], [ 15.009451580395588, 54.01766599668845 ], [ 15.03487168826265, 53.98619127038888 ], [ 15.065437450226318, 53.95632722947111 ], [ 15.100854501289938, 53.92836148097451 ], [ 15.140781755890838, 53.90256335034474 ], [ 15.184834692740752, 53.87918128768247 ], [ 15.232589057976034, 53.85844047503306 ], [ 15.283584950954273, 53.840540657760414 ], [ 15.3373312533489, 53.825654220889895 ], [ 15.393310358887137, 53.81392452894633 ], [ 15.450983158181355, 53.80546454527523 ], [ 15.509794230647199, 53.80035574414404 ], [ 15.569177193507414, 53.79864732610042 ], [ 15.62856015636763, 53.80035574414404 ], [ 15.687371228833472, 53.80546454527523 ], [ 15.745044028127692, 53.81392452894633 ], [ 15.801023133665929, 53.825654220889895 ], [ 15.854769436060556, 53.840540657760414 ], [ 15.905765329038795, 53.85844047503306 ], [ 15.953519694274076, 53.87918128768247 ], [ 15.99757263112399, 53.90256335034474 ], [ 16.03749988572489, 53.92836148097451 ], [ 16.072916936788513, 53.95632722947111 ], [ 16.10348269875218, 53.98619127038888 ], [ 16.12890280661924, 54.01766599668845 ], [ 16.148932450854893, 54.05044828954971 ], [ 16.163378735035824, 54.084222437571796 ], [ 16.172102533548234, 54.11866317724642 ], [ 16.175019831443535, 54.15343882542328 ] ] ] }, "properties": { "_kind": "selection-circle", "_radius_m": 39495 }, "type": "Feature" } ], "properties": { "lat": 60.62801, "lng": 0.307419, "map": "se", "zoom": 4.05 }, "type": "FeatureCollection" } ```

map-issues-bot commented 2026-08-03 21:45:18 +00:00

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z4

---

Location: z5 / 58.52275 / 7.09848
Area: circle r=67353 m @ 54.59783, 18.33572

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map-issues-bot commented 2026-08-03 21:46:03 +00:00

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z6

---

Location: z7 / 54.60001 / 17.42292
Area: circle r=8401 m @ 54.38799, 16.31268

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map-issues-bot commented 2026-08-03 21:46:29 +00:00

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art commented 2026-08-04 10:42:17 +00:00

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Related to #41 (greenlit 2026-08-04): #41 is the same dominant-neighbour absorption machinery drifting cover classes; this issue may be the water face of the same ratchet (a coastal lake's sub-threshold patches absorbing into the sea as the dominant neighbour). Worked right after this one — if the #47 fix turns out to cover #41's class drift, #41 closes as fixed-by.

Related to #41 (greenlit 2026-08-04): #41 is the same dominant-neighbour absorption machinery drifting cover classes; this issue may be the water face of the same ratchet (a coastal lake's sub-threshold patches absorbing into the sea as the dominant neighbour). Worked right after this one — if the #47 fix turns out to cover #41's class drift, #41 closes as fixed-by.

art referenced this issue 2026-08-04 10:42:17 +00:00

Landcover absorption drifts every class into the dominant one #41

map-issues-bot added the

claude-wip

label 2026-08-04 12:19:40 +00:00

art referenced this issue from a pull request that will close it, 2026-08-04 15:18:40 +00:00

#47: Water eats coast lines again. #55

art commented 2026-08-04 15:18:41 +00:00

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PR #55 — #55

PR #55 — https://git.blahonga.org/art/ismap/pulls/55

art referenced this issue from a commit 2026-08-04 15:18:41 +00:00

absorb_boundary: never cross the water line with a drawable polygon

art referenced this issue from a commit 2026-08-04 15:18:41 +00:00

docs: absorb_boundary cross-boundary floor, mechanism and measurement (issue #47)

art added

needs-review

and removed

claude-wip

labels 2026-08-04 15:18:41 +00:00

art-bot referenced this issue 2026-08-04 18:38:06 +00:00

#47: Water eats coast lines again. #55

art referenced this issue 2026-08-04 18:42:23 +00:00

#41: Landcover absorption drifts every class into the dominant one #56

art referenced this issue from a commit 2026-08-04 18:42:24 +00:00

absorb_boundary: never cross the water line with a drawable polygon

art referenced this issue from a commit 2026-08-04 18:42:24 +00:00

docs: absorb_boundary cross-boundary floor, mechanism and measurement (issue #47)

art referenced this issue from a commit 2026-08-04 18:42:24 +00:00

test: cluster floor must not disable the #47 cross-boundary floor

art referenced this issue from a commit 2026-08-04 18:42:24 +00:00

docs: final combined-build verification numbers for the #41 cluster floor

art-bot referenced this issue 2026-08-04 18:49:11 +00:00

#41: Landcover absorption drifts every class into the dominant one #56

art referenced this issue from a commit 2026-08-05 01:50:22 +00:00

absorb_boundary: never cross the water line with a drawable polygon

art referenced this issue from a commit 2026-08-05 01:50:22 +00:00

docs: absorb_boundary cross-boundary floor, mechanism and measurement (issue #47)

art referenced this issue from a commit 2026-08-05 01:58:45 +00:00

absorb_boundary: never cross the water line with a drawable polygon

art referenced this issue from a commit 2026-08-05 01:58:45 +00:00

docs: absorb_boundary cross-boundary floor, mechanism and measurement (issue #47)

art referenced this issue from a commit 2026-08-05 01:58:45 +00:00

test: cluster floor must not disable the #47 cross-boundary floor

art referenced this issue from a commit 2026-08-05 01:58:45 +00:00

docs: final combined-build verification numbers for the #41 cluster floor

art referenced this issue from a commit 2026-08-05 01:58:45 +00:00

docs: correct the cluster eps at the two stale doc sites, note batch scoping (PR #56 review)

art referenced this issue 2026-08-05 02:00:17 +00:00

#41: Landcover absorption drifts every class into the dominant one #56

art referenced this issue 2026-08-05 02:00:50 +00:00

#41: Landcover absorption drifts every class into the dominant one #56

art referenced this issue 2026-08-05 04:26:37 +00:00

missing iceland landcover #46

art referenced this issue 2026-08-05 05:49:57 +00:00

#41: Landcover absorption drifts every class into the dominant one #56

art referenced this issue from a commit 2026-08-05 07:20:30 +00:00

absorb_boundary: never cross the water line with a drawable polygon

art referenced this issue from a commit 2026-08-05 07:20:30 +00:00

docs: absorb_boundary cross-boundary floor, mechanism and measurement (issue #47)

art referenced this issue from a commit 2026-08-05 07:20:30 +00:00

test: cluster floor must not disable the #47 cross-boundary floor

art referenced this issue from a commit 2026-08-05 07:20:30 +00:00

docs: final combined-build verification numbers for the #41 cluster floor

art referenced this issue from a commit 2026-08-05 07:20:30 +00:00

docs: correct the cluster eps at the two stale doc sites, note batch scoping (PR #56 review)

art commented 2026-08-05 08:04:05 +00:00

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Resolved by #55 and #56

Resolved by #55 and #56

art closed this issue 2026-08-05 08:04:05 +00:00

art referenced this issue 2026-08-05 08:39:23 +00:00

missing iceland landcover #46

art referenced this issue 2026-08-05 09:24:25 +00:00

cover: exclude LMÍ's broken sea polygon, compute a valid sea from the coastline (issue #46) #61

art referenced this issue 2026-08-05 09:24:32 +00:00

missing iceland landcover #46

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