Bug report #11333

TWD 67 projection CRSs are not correct

Added by Yu-Hsuan Tu over 8 years ago. Updated almost 4 years ago.

Category:Projection Support
Affected QGIS version:2.4.0 Regression?:No
Operating System:Windows Easy fix?:No
Pull Request or Patch supplied:No Resolution:end of life
Crashes QGIS or corrupts data:No Copied to github as #:19627


The built-in TWD 67 / TM2 zone 119 and zone 121 are not correct. They're default parameters are stated as below:

+proj=tmerc +lat_0=0 +lon_0=119 +k=0.9999 +x_0=250000 +y_0=0 +ellps=aust_SA +units=m +no_defs
+proj=tmerc +lat_0=0 +lon_0=121 +k=0.9999 +x_0=250000 +y_0=0 +ellps=aust_SA +units=m +no_defs

However, these setting cannot match those features in TWD 67 to the right positions. Here are the correct parameters for TWD 67 / TM2 zone 119 and 121:

+proj=tmerc +ellps=GRS67 +towgs84=-752,-358,-179,-.0000011698,.0000018398,.0000009822,.00002329 +lon_0=121 +x_0=250000 +k=0.9999 +to +proj=tmerc +datum=WGS84 +lon_0=119 +x_0=250000 +k=0.9999
+proj=tmerc +ellps=GRS67 +towgs84=-752,-358,-179,-.0000011698,.0000018398,.0000009822,.00002329 +lon_0=121 +x_0=250000 +k=0.9999 +to +proj=tmerc +datum=WGS84 +lon_0=121 +x_0=250000 +k=0.9999

Hope they can be fixed at the next release.


#1 Updated by Giovanni Manghi almost 6 years ago

  • Easy fix? set to No
  • Regression? set to No

#2 Updated by Giovanni Manghi almost 4 years ago

  • Resolution set to end of life
  • Status changed from Open to Closed

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