Datum Adjustment and Spheroid Conversion of Geodetic Positions
1956 Volume 3 Issue 1 Pages 16-20
Details
1956 Volume 3 Issue 1 Pages 16-20
I. Datum Adjustment, Tokyo to Manchuria
Triangulation survey based on Tokyo datum, Bessel spheroid, extends from Japan to Korea and is tied to the Manchurian triangulation system on Hsinking datum, Bessel spheroid, through 23 common points.
The adjustment was developed and accomplished from the difference of geographical coordinates (Hsinking minus Tokyo) for these common points . The results are as follows:
dψ0=-8″.745 dλ0=+16″.829
K10.-4=+0″.526 dA0=-3″.44
These are values correlated to the both datums . However, the value for longitude shows considerable discrepancy when compared with the value of systematic error previously known in Tokyo datum.
Tokyo datum dψ0=+8″.54 dλ0=-6″.54 (Kawabata-1940)
Hsinking datum dψ0=+0″.254 dλ0=+2″.185 (Omori-1942)
Tokyo datum — dλ0=-13″.38 (Hirose-1948)
II. Spheroid conversion, Bessel to International
Geographical coordinates of 20 1st order triangulation on Bessel spheroid in Taiwan were converted to International spheroid . The B. G. Bonford formula which was slightly modified was used.
Result of an investigation on accuracy revealed that it is sufficient for conversion of 3rd and lower order triangulation (three decimal places in second, geographical coordinates) .
