{"action":"created","issue":{"url":"https://api.github.com/repos/mavlink/mavlink/issues/1002","repository_url":"https://api.github.com/repos/mavlink/mavlink","labels_url":"https://api.github.com/repos/mavlink/mavlink/issues/1002/labels{/name}","comments_url":"https://api.github.com/repos/mavlink/mavlink/issues/1002/comments","events_url":"https://api.github.com/repos/mavlink/mavlink/issues/1002/events","html_url":"https://github.com/mavlink/mavlink/pull/1002","id":368009965,"node_id":"MDExOlB1bGxSZXF1ZXN0MjIxMjg1OTU0","number":1002,"title":"Use consistent altitude references","user":{"login":"hamishwillee","id":5368500,"node_id":"MDQ6VXNlcjUzNjg1MDA=","avatar_url":"https://avatars2.githubusercontent.com/u/5368500?v=4","gravatar_id":"","url":"https://api.github.com/users/hamishwillee","html_url":"https://github.com/hamishwillee","followers_url":"https://api.github.com/users/hamishwillee/followers","following_url":"https://api.github.com/users/hamishwillee/following{/other_user}","gists_url":"https://api.github.com/users/hamishwillee/gists{/gist_id}","starred_url":"https://api.github.com/users/hamishwillee/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hamishwillee/subscriptions","organizations_url":"https://api.github.com/users/hamishwillee/orgs","repos_url":"https://api.github.com/users/hamishwillee/repos","events_url":"https://api.github.com/users/hamishwillee/events{/privacy}","received_events_url":"https://api.github.com/users/hamishwillee/received_events","type":"User","site_admin":false},"labels":[{"id":908774435,"node_id":"MDU6TGFiZWw5MDg3NzQ0MzU=","url":"https://api.github.com/repos/mavlink/mavlink/labels/Dev%20Call","name":"Dev Call","color":"0e98d3","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":3,"created_at":"2018-10-09T01:46:04Z","updated_at":"2018-10-24T03:14:45Z","closed_at":null,"author_association":"CONTRIBUTOR","pull_request":{"url":"https://api.github.com/repos/mavlink/mavlink/pulls/1002","html_url":"https://github.com/mavlink/mavlink/pull/1002","diff_url":"https://github.com/mavlink/mavlink/pull/1002.diff","patch_url":"https://github.com/mavlink/mavlink/pull/1002.patch"},"body":"Globally we want to use the most \"standard\" terminology for frames possible. For altitude those are WGS84, MSL and AGL. The use of \"Absolute\" is redundant."},"comment":{"url":"https://api.github.com/repos/mavlink/mavlink/issues/comments/432497377","html_url":"https://github.com/mavlink/mavlink/pull/1002#issuecomment-432497377","issue_url":"https://api.github.com/repos/mavlink/mavlink/issues/1002","id":432497377,"node_id":"MDEyOklzc3VlQ29tbWVudDQzMjQ5NzM3Nw==","user":{"login":"hamishwillee","id":5368500,"node_id":"MDQ6VXNlcjUzNjg1MDA=","avatar_url":"https://avatars2.githubusercontent.com/u/5368500?v=4","gravatar_id":"","url":"https://api.github.com/users/hamishwillee","html_url":"https://github.com/hamishwillee","followers_url":"https://api.github.com/users/hamishwillee/followers","following_url":"https://api.github.com/users/hamishwillee/following{/other_user}","gists_url":"https://api.github.com/users/hamishwillee/gists{/gist_id}","starred_url":"https://api.github.com/users/hamishwillee/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hamishwillee/subscriptions","organizations_url":"https://api.github.com/users/hamishwillee/orgs","repos_url":"https://api.github.com/users/hamishwillee/repos","events_url":"https://api.github.com/users/hamishwillee/events{/privacy}","received_events_url":"https://api.github.com/users/hamishwillee/received_events","type":"User","site_admin":false},"created_at":"2018-10-24T03:14:45Z","updated_at":"2018-10-24T03:14:45Z","author_association":"CONTRIBUTOR","body":"matrixpilot.xml has some odd cases\r\n\r\nAny idea what I should put for these - AGL, MSL or WGS84?\r\n\r\n```\r\n<field type=\"int32_t\" name=\"sue_altitude\">Serial UDB Extra Altitude</field>\r\n<field type=\"int32_t\" name=\"sue_barom_alt\">SUE barometer altitude</field>\r\n<field type=\"int32_t\" name=\"sue_alt_origin\">Serial UDB Extra MP Origin Altitude Above Sea Level</field>\r\n```\r\n\r\nSimilarly for these - AGL, MSL or WGS84? Ie can I assume cases where it says Above Ground is AGL. For GPS altitude, is that WGS84?\r\n```\r\n    <message id=\"181\" name=\"ALTITUDES\">\r\n      <description>The altitude measured by sensors and IMU</description>\r\n      <field type=\"uint32_t\" name=\"time_boot_ms\">Timestamp (milliseconds since system boot)</field>\r\n      <field type=\"int32_t\" name=\"alt_gps\">GPS altitude in meters, expressed as * 1000 (millimeters), above MSL</field>\r\n      <field type=\"int32_t\" name=\"alt_imu\">IMU altitude above ground in meters, expressed as * 1000 (millimeters)</field>\r\n      <field type=\"int32_t\" name=\"alt_barometric\">barometeric altitude above ground in meters, expressed as * 1000 (millimeters)</field>\r\n      <field type=\"int32_t\" name=\"alt_optical_flow\">Optical flow altitude above ground in meters, expressed as * 1000 (millimeters)</field>\r\n      <field type=\"int32_t\" name=\"alt_range_finder\">Rangefinder Altitude above ground in meters, expressed as * 1000 (millimeters)</field>\r\n      <field type=\"int32_t\" name=\"alt_extra\">Extra altitude above ground in meters, expressed as * 1000 (millimeters)</field>\r\n    </message>\r\n```"}}
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