{"action":"created","issue":{"url":"https://api.github.com/repos/mapbox/tippecanoe/issues/452","repository_url":"https://api.github.com/repos/mapbox/tippecanoe","labels_url":"https://api.github.com/repos/mapbox/tippecanoe/issues/452/labels{/name}","comments_url":"https://api.github.com/repos/mapbox/tippecanoe/issues/452/comments","events_url":"https://api.github.com/repos/mapbox/tippecanoe/issues/452/events","html_url":"https://github.com/mapbox/tippecanoe/issues/452","id":250613968,"number":452,"title":"Getting 'detail' and 'resolution' right...","user":{"login":"jliebrand","id":23407884,"avatar_url":"https://avatars3.githubusercontent.com/u/23407884?v=4","gravatar_id":"","url":"https://api.github.com/users/jliebrand","html_url":"https://github.com/jliebrand","followers_url":"https://api.github.com/users/jliebrand/followers","following_url":"https://api.github.com/users/jliebrand/following{/other_user}","gists_url":"https://api.github.com/users/jliebrand/gists{/gist_id}","starred_url":"https://api.github.com/users/jliebrand/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jliebrand/subscriptions","organizations_url":"https://api.github.com/users/jliebrand/orgs","repos_url":"https://api.github.com/users/jliebrand/repos","events_url":"https://api.github.com/users/jliebrand/events{/privacy}","received_events_url":"https://api.github.com/users/jliebrand/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-08-16T12:45:25Z","updated_at":"2017-08-16T16:53:55Z","closed_at":null,"body":"Hey there - this isn't really a bug, but more a request for help. I've been trying to get my head around the 'detail' parameter, and understanding how best to tweak the various parameters on tippecanoe to get \"smoothing of features\" at lower zoom levels to work well, but I think I'm either not understanding it, or just not quite getting my numbers right.\r\n\r\nI took the land polygons from open street:\r\nhttp://data.openstreetmapdata.com/land-polygons-split-3857.zip\r\n\r\nThen converted the shp to geojson:\r\nogr2ogr -f \"GeoJSON\" land-polygons.json land-polygons-split-3857/land_polygons.shp -t_srs EPSG:4326\r\n\r\nAnd then ran tippecanoe over that:\r\ntippecanoe -P -z12 -Bg -rg -pt -as -pg -o test.mbtiles -Llndpol:land-polygons.json\r\n\r\nOutcome:\r\nhttps://api.mapbox.com/styles/v1/liebrand/cj6ezunxd220y2smxwxd9x85j.html?title=true&access_token=pk.eyJ1IjoibGllYnJhbmQiLCJhIjoiY2lld2FpcXpkMTJpbjkxbTNzZGU1YXl6OCJ9.akW57lx-2jkyO6IohS6yfA#3.39/50.27/-3.35\r\n\r\nAs you can see, there are lots a tiles that appear missing, which I'm guessing is because of the -as ?\r\nBut also, as you zoom out, the detail is far too great, rather than getting smooth coastlines, it's showing too much detail.\r\n\r\nI'm guessing the default detail of 12 is too high? or at least for the lower zoom levels? \r\n\r\n"},"comment":{"url":"https://api.github.com/repos/mapbox/tippecanoe/issues/comments/322833739","html_url":"https://github.com/mapbox/tippecanoe/issues/452#issuecomment-322833739","issue_url":"https://api.github.com/repos/mapbox/tippecanoe/issues/452","id":322833739,"user":{"login":"ericfischer","id":1951835,"avatar_url":"https://avatars1.githubusercontent.com/u/1951835?v=4","gravatar_id":"","url":"https://api.github.com/users/ericfischer","html_url":"https://github.com/ericfischer","followers_url":"https://api.github.com/users/ericfischer/followers","following_url":"https://api.github.com/users/ericfischer/following{/other_user}","gists_url":"https://api.github.com/users/ericfischer/gists{/gist_id}","starred_url":"https://api.github.com/users/ericfischer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ericfischer/subscriptions","organizations_url":"https://api.github.com/users/ericfischer/orgs","repos_url":"https://api.github.com/users/ericfischer/repos","events_url":"https://api.github.com/users/ericfischer/events{/privacy}","received_events_url":"https://api.github.com/users/ericfischer/received_events","type":"User","site_admin":false},"created_at":"2017-08-16T16:53:55Z","updated_at":"2017-08-16T16:53:55Z","body":"The detail at low zooms used to be 8, but this aggravated some bugs in software that wrongly assumed that tiles always had a resolution of 4096x4096 instead of checking the extent, so I changed the default to be 12 in every case to work around that.\r\n\r\nI'll download your file and take a look."}}
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