Timeline for Issue converting projected coordinates to wgs1984 in Postgis
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 5, 2016 at 17:29 | comment | added | mkennedy | If two transformations are both 'equation-based' (3 or 7 parameters), you can algebraically add the values--with the signs corrected for an inverse/reverse applied transformation--to make a new comcatenated transformation. In this case, the 2nd tfm's parameters are zeroes. | |
| Aug 5, 2016 at 15:24 | comment | added | Paul Ramsey | @Kirk, No, we just do what proj4 does, which is apply a single towgs84 transform. | |
| Aug 5, 2016 at 15:22 | comment | added | Ivan | Thanks a lot! That worked perfectly, and saved me a lot of work. Btw, just yesterday I was reading your foreword in PostGIS in Action, great book. | |
| Aug 5, 2016 at 15:18 | comment | added | Kirk Kuykendall |
So does PostGIS support "composite" transformations like ArcGIS, e.g. Campo_Inchauspe_To_Posgar_2007_1 + Posgar_2007_To_Wgs_1984_1 ?
|
|
| Aug 5, 2016 at 15:15 | vote | accept | Ivan | ||
| Aug 5, 2016 at 15:10 | history | answered | Paul Ramsey | CC BY-SA 3.0 |