Convert coordinates from TWD67 / TM2 zone 121 (EPSG:3828) to TWD97 / TM2 zone 121 (EPSG:3826) — official EPSG transformation parameters, accuracy and area of use, with a free in-browser converter.
The EPSG Geodetic Parameter Dataset defines 1 transformation between TWD67 / TM2 zone 121 (EPSG:3828) and TWD97 / TM2 zone 121 (EPSG:3826). Its parameters, accuracy and area of use are listed below.
| Parameter | Value | Unit |
|---|---|---|
| Easting offset | 828.589 | metre |
| Northing offset | -206.915 | metre |
Derived at Hu Tzu Shan (23°59'N, 120°58'E). Residuals increase to maximum of 6.4m as distance increases from this point.
The same transformation with common GIS tools and libraries:
from pyproj import Transformer
transformer = Transformer.from_crs("EPSG:3828", "EPSG:3826", always_xy=True)
x, y = transformer.transform(-73.9857, 40.7484)
print(x, y)projected system measured in linear units (typically metres) · Area of use: Taiwan - onshore - mainland
+proj=tmerc +lat_0=0 +lon_0=121 +k=0.9999 +x_0=250000 +y_0=0 +ellps=aust_SA +units=m +no_defs +type=crsMore about EPSG:3828 →
projected system measured in linear units (typically metres) · Area of use: Taiwan - 120°E to 122°E
+proj=tmerc +lat_0=0 +lon_0=121 +k=0.9999 +x_0=250000 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crsMore about EPSG:3826 →