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In the process of plotting some h3 hexes, I started running into a wild bug: it seems there is some hitch during reprojection that is causing Vega to fill the entire outer boundary of the map with the polygon.
Below is a basic example, with a single hexagon in EPSG:4326 (WGS84) coordinates (where lat ranges from -90 to 90, and lon ranges from -180 to 180). Note that I kept the polygon unfilled so you could see what was happening.
Interestingly, the hexagon does correctly appear in this map - you just have to really zoom in to see it for some reason: update the code to change the following line...
Why do I say this is a specific issue to reprojection? Well, it doesn't happen if "type":"identity", and it happens with any type projection I put in there - equalEarth, transverseMercator, etc.
This is mainly posing an issue because it is messing up the auto-determined extent variable - I have to manually set center and scale properties to actually "see" the data I care about! I also have to plot my polygons are unfilled entities, i.e. I can't make a choropleth.
Worryingly, I can't make it be an issue on every polygon I plot... but it is happening to many of them. For example, this New Zealand outline seems to plot fine...
Toggle to show NZ Example
This comes from Natural Earth, [per the Python documentation](https://altair-viz.github.io/user_guide/marks/geoshape.html#basic-map)
Bug Description
In the process of plotting some h3 hexes, I started running into a wild bug: it seems there is some hitch during reprojection that is causing Vega to fill the entire outer boundary of the map with the polygon.
Below is a basic example, with a single hexagon in
EPSG:4326(WGS84) coordinates (where lat ranges from -90 to 90, and lon ranges from -180 to 180). Note that I kept the polygon unfilled so you could see what was happening.{ "$schema": "https://vega.github.io/schema/vega-lite/v5.20.1.json", "config": {"view": {"continuousHeight": 800, "continuousWidth": 800}}, "data": {"name": "hex"}, "datasets": { "hex": [ { "geometry": { "coordinates": [ [ [174.82452404381874, -41.29790050306431], [174.81940173732693, -41.30098816110715], [174.82014390887468, -41.30593404925304], [174.82600905735126, -41.307792013940954], [174.8311312918481, -41.304704070903085], [174.83038844992387, -41.299758448186914], [174.82452404381874, -41.29790050306431] ] ], "type": "Polygon" }, "hex": "88bb294289fffff", "type": "Feature" } ] }, "mark": {"filled": false, "type": "geoshape"}, "projection": {"type": "mercator"}, "usermeta": {"embedOptions": {}}, "width": "container" }Interestingly, the hexagon does correctly appear in this map - you just have to really zoom in to see it for some reason: update the code to change the following line...
... and it appears!
Why do I say this is a specific issue to reprojection? Well, it doesn't happen if
"type":"identity", and it happens with anytypeprojection I put in there -equalEarth,transverseMercator, etc.This is mainly posing an issue because it is messing up the auto-determined
extentvariable - I have to manually setcenterandscaleproperties to actually "see" the data I care about! I also have to plot my polygons are unfilled entities, i.e. I can't make a choropleth.Worryingly, I can't make it be an issue on every polygon I plot... but it is happening to many of them. For example, this New Zealand outline seems to plot fine...
Toggle to show NZ Example
This comes from Natural Earth, [per the Python documentation](https://altair-viz.github.io/user_guide/marks/geoshape.html#basic-map){ "$schema": "https://vega.github.io/schema/vega-lite/v5.20.1.json", "config": {"view": {"continuousHeight": 300, "continuousWidth": 300}}, "data": {"name": "data-f351af4caeb47fc8292d432c8b60b8aa"}, "datasets": { "data-f351af4caeb47fc8292d432c8b60b8aa": [ { "NAME": "New Zealand", "geometry": { "coordinates": [ [ [ [176.8858236026052, -40.0659778785822], [176.50801720611926, -40.60480803808957], [176.01244022044023, -41.28962411882147], [175.23956749908297, -41.68830779395328], [175.06789839100935, -41.42589487077513], [174.65097293527847, -41.2818209775454], [175.22763024322356, -40.45923552832336], [174.9001566917899, -39.9089332008472], [173.82404666574394, -39.50885426204351], [173.85226199777532, -39.14660247167748], [174.57480187408035, -38.797683200842755], [174.74347374908098, -38.02780771255843], [174.6970166364506, -37.38112883885792], [174.2920284365792, -36.71109221776149], [174.31900353423552, -36.53482390721391], [173.8409965355357, -36.12198088963413], [173.0541711774596, -35.23712533950039], [172.63600548735377, -34.52910654066943], [173.00704227120946, -34.45066171645037], [173.55129845610747, -35.00618336358801], [174.3293904971262, -35.26549570082862], [174.61200890533044, -36.15639739354052], [175.33661583892712, -37.20909799575827], [175.3575964704376, -36.52619394302117], [175.80888675364253, -36.79894215265767], [175.9584900251275, -37.55538176854612], [176.76319542877656, -37.881253350578675], [177.4388131045605, -37.961248467766495], [178.01035444570866, -37.579824721020174], [178.51709354076274, -37.6953732236248], [178.27473107331383, -38.58281259537314], [177.97046023997927, -39.166342868812976], [177.20699262929918, -39.14577564876082], [176.93998050364706, -39.44973642350161], [177.0329464053401, -39.879942722331464], [176.8858236026052, -40.0659778785822] ] ], [ [ [169.66781456937315, -43.555325616226376], [170.52491987536615, -43.031688327812816], [171.125089960004, -42.51275359473782], [171.56971398344325, -41.767424411792135], [171.94870893787186, -41.514416599291124], [172.0972270042787, -40.956104424809716], [172.79857954334403, -40.4939620908235], [173.02037479074076, -40.919052422856446], [173.2472343285021, -41.33199879330081], [173.9584053897028, -40.926700534835646], [174.24758670480816, -41.34915536882171], [174.24851688058942, -41.77000823340673], [173.87644656808794, -42.23318409603879], [173.2227396995957, -42.970038344088614], [172.71124637277074, -43.372287693048555], [173.08011274647015, -43.853343601253606], [172.3085836123525, -43.86569426857136], [171.45292524646362, -44.2425188128437], [171.18513797432718, -44.89710418068486], [170.61669721911653, -45.908928724959736], [169.8314221540093, -46.35577483498757], [169.33233117093428, -46.641235446967876], [168.41135379462855, -46.61994475686363], [167.76374474514682, -46.29019744240919], [166.67688602118417, -46.219917494492236], [166.50914432196467, -45.85270476662619], [167.0464241885033, -45.110941257508635], [168.30376346259686, -44.12397307716614], [168.94940880765157, -43.935819187191434], [169.66781456937315, -43.555325616226376] ] ] ], "type": "MultiPolygon" }, "type": "Feature" } ] }, "mark": {"type": "geoshape"}, "projection": {"type": "mercator"}, "usermeta": {"embedOptions": {}}, "width": "container" }Hope this makes sense to someone! I've pulled my hair out over it all day and can't figure out what is happening at all.
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