{"action":"created","issue":{"url":"https://api.github.com/repos/OSGeo/proj.4/issues/664","repository_url":"https://api.github.com/repos/OSGeo/proj.4","labels_url":"https://api.github.com/repos/OSGeo/proj.4/issues/664/labels{/name}","comments_url":"https://api.github.com/repos/OSGeo/proj.4/issues/664/comments","events_url":"https://api.github.com/repos/OSGeo/proj.4/issues/664/events","html_url":"https://github.com/OSGeo/proj.4/pull/664","id":273616093,"number":664,"title":"Support numerical factors only","user":{"login":"busstoptaktik","id":5608365,"avatar_url":"https://avatars3.githubusercontent.com/u/5608365?v=4","gravatar_id":"","url":"https://api.github.com/users/busstoptaktik","html_url":"https://github.com/busstoptaktik","followers_url":"https://api.github.com/users/busstoptaktik/followers","following_url":"https://api.github.com/users/busstoptaktik/following{/other_user}","gists_url":"https://api.github.com/users/busstoptaktik/gists{/gist_id}","starred_url":"https://api.github.com/users/busstoptaktik/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/busstoptaktik/subscriptions","organizations_url":"https://api.github.com/users/busstoptaktik/orgs","repos_url":"https://api.github.com/users/busstoptaktik/repos","events_url":"https://api.github.com/users/busstoptaktik/events{/privacy}","received_events_url":"https://api.github.com/users/busstoptaktik/received_events","type":"User","site_admin":false},"labels":[{"id":214661627,"url":"https://api.github.com/repos/OSGeo/proj.4/labels/enhancement","name":"enhancement","color":"84b6eb","default":true}],"state":"closed","locked":false,"assignee":{"login":"busstoptaktik","id":5608365,"avatar_url":"https://avatars3.githubusercontent.com/u/5608365?v=4","gravatar_id":"","url":"https://api.github.com/users/busstoptaktik","html_url":"https://github.com/busstoptaktik","followers_url":"https://api.github.com/users/busstoptaktik/followers","following_url":"https://api.github.com/users/busstoptaktik/following{/other_user}","gists_url":"https://api.github.com/users/busstoptaktik/gists{/gist_id}","starred_url":"https://api.github.com/users/busstoptaktik/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/busstoptaktik/subscriptions","organizations_url":"https://api.github.com/users/busstoptaktik/orgs","repos_url":"https://api.github.com/users/busstoptaktik/repos","events_url":"https://api.github.com/users/busstoptaktik/events{/privacy}","received_events_url":"https://api.github.com/users/busstoptaktik/received_events","type":"User","site_admin":false},"assignees":[{"login":"busstoptaktik","id":5608365,"avatar_url":"https://avatars3.githubusercontent.com/u/5608365?v=4","gravatar_id":"","url":"https://api.github.com/users/busstoptaktik","html_url":"https://github.com/busstoptaktik","followers_url":"https://api.github.com/users/busstoptaktik/followers","following_url":"https://api.github.com/users/busstoptaktik/following{/other_user}","gists_url":"https://api.github.com/users/busstoptaktik/gists{/gist_id}","starred_url":"https://api.github.com/users/busstoptaktik/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/busstoptaktik/subscriptions","organizations_url":"https://api.github.com/users/busstoptaktik/orgs","repos_url":"https://api.github.com/users/busstoptaktik/repos","events_url":"https://api.github.com/users/busstoptaktik/events{/privacy}","received_events_url":"https://api.github.com/users/busstoptaktik/received_events","type":"User","site_admin":false}],"milestone":null,"comments":2,"created_at":"2017-11-13T23:32:58Z","updated_at":"2017-11-15T10:06:18Z","closed_at":"2017-11-15T08:03:40Z","author_association":"MEMBER","pull_request":{"url":"https://api.github.com/repos/OSGeo/proj.4/pulls/664","html_url":"https://github.com/OSGeo/proj.4/pull/664","diff_url":"https://github.com/OSGeo/proj.4/pull/664.diff","patch_url":"https://github.com/OSGeo/proj.4/pull/664.patch"},"body":"Support for the \"special\" entry of PJ, which enabled PROJ.4 to compute analytically derived, rather than numerically approximated, values for a. o. scale factors and convergence, was limited to the `PJ_lcc.c` and `PJ_eqdc.c` projection implementations.\r\n\r\nAnd for the past 20 years, the need for that functionality has not been so huge as to animate anyone to implement it for more than those two projections - so the need is apparently limited.\r\n\r\nIt could even be argued that it is more relevant to get the numerical approximation for the *actually implemented algorithm*, than the analytically derived values for the *mathematical abstract* version.\r\n\r\nRemoving the feature simplifies the code a bit, and also reduces the documentation needed to be written a comparative bit.\r\n\r\n**Note:** This PR does not touch the availability of the convergence, etc. computations - it just results in treating all projections equal, by using numerical approximation even in those two cases that formerly provided analytical versions."},"comment":{"url":"https://api.github.com/repos/OSGeo/proj.4/issues/comments/344545234","html_url":"https://github.com/OSGeo/proj.4/pull/664#issuecomment-344545234","issue_url":"https://api.github.com/repos/OSGeo/proj.4/issues/664","id":344545234,"user":{"login":"busstoptaktik","id":5608365,"avatar_url":"https://avatars3.githubusercontent.com/u/5608365?v=4","gravatar_id":"","url":"https://api.github.com/users/busstoptaktik","html_url":"https://github.com/busstoptaktik","followers_url":"https://api.github.com/users/busstoptaktik/followers","following_url":"https://api.github.com/users/busstoptaktik/following{/other_user}","gists_url":"https://api.github.com/users/busstoptaktik/gists{/gist_id}","starred_url":"https://api.github.com/users/busstoptaktik/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/busstoptaktik/subscriptions","organizations_url":"https://api.github.com/users/busstoptaktik/orgs","repos_url":"https://api.github.com/users/busstoptaktik/repos","events_url":"https://api.github.com/users/busstoptaktik/events{/privacy}","received_events_url":"https://api.github.com/users/busstoptaktik/received_events","type":"User","site_admin":false},"created_at":"2017-11-15T10:06:17Z","updated_at":"2017-11-15T10:06:17Z","author_association":"MEMBER","body":"@kbevers, they are necessary still because user programs may be checking them. By ensuring that `fac->code==0`, these programs will still get the right answer, that \"these factors were computed numerically\""}}
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