Timeline for QGIS Transforming from ETRS89 to WGS84 - why are Helmert parameters 0?
Current License: CC BY-SA 4.0
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| May 27 at 13:05 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Jan 21 at 11:05 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Sep 22, 2023 at 20:03 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| May 20, 2023 at 5:03 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Apr 12, 2023 at 14:57 | answer | added | CalebJ | timeline score: 1 | |
| Sep 10, 2019 at 8:10 | comment | added | user30184 | However, according to this presentation euref.eu/documentation/Tutorial2019/t-03-Hakli.pdf it is possible to deal with moving plates with current Proj library version. In that case user must know not only z, y, and z coordinates but time as well. | |
| Sep 10, 2019 at 0:00 | history | tweeted | twitter.com/StackGIS/status/1171211874177867776 | ||
| Sep 9, 2019 at 17:57 | comment | added | user30184 |
GIS people usually do not care. See github.com/OSGeo/PROJ/issues/571 ETRS89 IS a datum, also known as a reference frame. ETRS89 is defined to be alligned with WGS84 in the year 1989. Today the two references are off by around 70 cm (ETRS89 moves with the Eurasian plate, WGS84 does not). Historically the two frames have been viewed as equivalent in GIS, which is why the +towgs84 parameters are 0..
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| Sep 9, 2019 at 16:44 | comment | added | Ian Turton | which time period are you looking at? | |
| Sep 9, 2019 at 16:32 | history | asked | Octahedral Cube | CC BY-SA 4.0 |