{"action":"created","issue":{"url":"https://api.github.com/repos/SciTools/iris/issues/1795","labels_url":"https://api.github.com/repos/SciTools/iris/issues/1795/labels{/name}","comments_url":"https://api.github.com/repos/SciTools/iris/issues/1795/comments","events_url":"https://api.github.com/repos/SciTools/iris/issues/1795/events","html_url":"https://github.com/SciTools/iris/pull/1795","id":107893551,"number":1795,"title":"Allow calculation of curl for cubes with 'grid_latitude' and 'grid_longitude' coords","user":{"login":"lbdreyer","id":8101163,"avatar_url":"https://avatars.githubusercontent.com/u/8101163?v=3","gravatar_id":"","url":"https://api.github.com/users/lbdreyer","html_url":"https://github.com/lbdreyer","followers_url":"https://api.github.com/users/lbdreyer/followers","following_url":"https://api.github.com/users/lbdreyer/following{/other_user}","gists_url":"https://api.github.com/users/lbdreyer/gists{/gist_id}","starred_url":"https://api.github.com/users/lbdreyer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/lbdreyer/subscriptions","organizations_url":"https://api.github.com/users/lbdreyer/orgs","repos_url":"https://api.github.com/users/lbdreyer/repos","events_url":"https://api.github.com/users/lbdreyer/events{/privacy}","received_events_url":"https://api.github.com/users/lbdreyer/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":5,"created_at":"2015-09-23T10:45:13Z","updated_at":"2015-11-09T11:23:11Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/SciTools/iris/pulls/1795","html_url":"https://github.com/SciTools/iris/pull/1795","diff_url":"https://github.com/SciTools/iris/pull/1795.diff","patch_url":"https://github.com/SciTools/iris/pull/1795.patch"},"body":"Rotated pole cubes tend to have the coord names 'grid_latitude' and 'grid_longitude'. These names aren't currently being allowed in the curl calculation despite it saying it handles rotated pole cubes."},"comment":{"url":"https://api.github.com/repos/SciTools/iris/issues/comments/155032387","html_url":"https://github.com/SciTools/iris/pull/1795#issuecomment-155032387","issue_url":"https://api.github.com/repos/SciTools/iris/issues/1795","id":155032387,"user":{"login":"pp-mo","id":2089069,"avatar_url":"https://avatars.githubusercontent.com/u/2089069?v=3","gravatar_id":"","url":"https://api.github.com/users/pp-mo","html_url":"https://github.com/pp-mo","followers_url":"https://api.github.com/users/pp-mo/followers","following_url":"https://api.github.com/users/pp-mo/following{/other_user}","gists_url":"https://api.github.com/users/pp-mo/gists{/gist_id}","starred_url":"https://api.github.com/users/pp-mo/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pp-mo/subscriptions","organizations_url":"https://api.github.com/users/pp-mo/orgs","repos_url":"https://api.github.com/users/pp-mo/repos","events_url":"https://api.github.com/users/pp-mo/events{/privacy}","received_events_url":"https://api.github.com/users/pp-mo/received_events","type":"User","site_admin":false},"created_at":"2015-11-09T11:23:11Z","updated_at":"2015-11-09T11:23:11Z","body":"> This change still doesn't mathematically test that it is returning an appropriate result\r\n\r\nI think the whole point is that calculations in a rotated latlon system should just produce **identical** results to those in a non-rotated system.\r\nSo there *is* no new maths here, it just enables the same operation in a rotated system.\r\n\r\nYou could explicitly test that the array result is the same when *only* the coord system is changed (e.g. [here](https://github.com/SciTools/iris/pull/1795/files#diff-034b84da207c675405e3b8ebe61fe343R627))\r\n \\- but it isn't clear to me what that would really add in any practical way ?\r\nIt seems analagous to \"checking that X calls Y and Z\", which is a level of testing we don't normally bother with.\r\n"}}