{"action":"closed","issue":{"url":"https://api.github.com/repos/OSGeo/proj.4/issues/5","repository_url":"https://api.github.com/repos/OSGeo/proj.4","labels_url":"https://api.github.com/repos/OSGeo/proj.4/issues/5/labels{/name}","comments_url":"https://api.github.com/repos/OSGeo/proj.4/issues/5/comments","events_url":"https://api.github.com/repos/OSGeo/proj.4/issues/5/events","html_url":"https://github.com/OSGeo/proj.4/issues/5","id":79324952,"number":5,"title":"tmerc \"back folding\" problems.","user":{"login":"proj4-bot","id":12542084,"avatar_url":"https://avatars.githubusercontent.com/u/12542084?v=3","gravatar_id":"","url":"https://api.github.com/users/proj4-bot","html_url":"https://github.com/proj4-bot","followers_url":"https://api.github.com/users/proj4-bot/followers","following_url":"https://api.github.com/users/proj4-bot/following{/other_user}","gists_url":"https://api.github.com/users/proj4-bot/gists{/gist_id}","starred_url":"https://api.github.com/users/proj4-bot/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/proj4-bot/subscriptions","organizations_url":"https://api.github.com/users/proj4-bot/orgs","repos_url":"https://api.github.com/users/proj4-bot/repos","events_url":"https://api.github.com/users/proj4-bot/events{/privacy}","received_events_url":"https://api.github.com/users/proj4-bot/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/OSGeo/proj.4/labels/bug","name":"bug","color":"fc2929"},{"url":"https://api.github.com/repos/OSGeo/proj.4/labels/C:%20Core","name":"C: Core","color":"0000aa"},{"url":"https://api.github.com/repos/OSGeo/proj.4/labels/P:%20major","name":"P: major","color":"f6f6f6"}],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":{"url":"https://api.github.com/repos/OSGeo/proj.4/milestones/2","html_url":"https://github.com/OSGeo/proj.4/milestones/4.7.0","labels_url":"https://api.github.com/repos/OSGeo/proj.4/milestones/2/labels","id":1125003,"number":2,"title":"4.7.0","description":"None","creator":{"login":"proj4-bot","id":12542084,"avatar_url":"https://avatars.githubusercontent.com/u/12542084?v=3","gravatar_id":"","url":"https://api.github.com/users/proj4-bot","html_url":"https://github.com/proj4-bot","followers_url":"https://api.github.com/users/proj4-bot/followers","following_url":"https://api.github.com/users/proj4-bot/following{/other_user}","gists_url":"https://api.github.com/users/proj4-bot/gists{/gist_id}","starred_url":"https://api.github.com/users/proj4-bot/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/proj4-bot/subscriptions","organizations_url":"https://api.github.com/users/proj4-bot/orgs","repos_url":"https://api.github.com/users/proj4-bot/repos","events_url":"https://api.github.com/users/proj4-bot/events{/privacy}","received_events_url":"https://api.github.com/users/proj4-bot/received_events","type":"User","site_admin":false},"open_issues":0,"closed_issues":12,"state":"closed","created_at":"2015-05-22T07:03:01Z","updated_at":"2016-10-22T15:51:47Z","due_on":"1970-01-01T00:00:00Z","closed_at":"2015-05-22T07:03:01Z"},"comments":19,"created_at":"2015-05-22T07:04:09Z","updated_at":"2016-10-22T15:51:47Z","closed_at":"2016-10-22T15:51:47Z","body":"**Reported by warmerdam on 17 Jun 2008 15:46 UTC**\nYou can demonstrate the problem with the PROJ.4 commandline program cs2cs:\r\n\r\n```\r\ncs2cs +proj=latlong +datum=WGS84 +to +proj=utm +zone=32 +datum=WGS84\r\n```\r\n\r\nGive as input, this point in Alaska:\r\n```\r\n-149.66 64.237\r\n```\r\nAnd you get this:\r\n```\r\n522986.92       5029096.80 0.00\r\n```\r\nwhich is somewhere in Italy (near Milan). \r\n\r\nI realize this result is an effect of using tmerc equations far from where they are valid, but it causes serious problems in MapServer when trying to establish which images intersect a target map request.  In this case we have images from around the world, some in relatively local projections like tmerc. We reproject the map request bounds into the target projection and check for overlap. \r\n\r\nWhat I would like is if we could make the tmerc projection fail (ie return HUGE_VAL) for points so far from the central meridian that they are likely to start folding back on themselves. \n\nMigrated-From: https://trac.osgeo.org/proj/ticket/5"}}
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