This research�s aim is to discover the combination of GNSS CORS and terretris method whether they can be used for land boundary area reconstruction by observing implementation steps and accuracy of measurement result the combination of GNSS CORS and terretris method used for land boundary area reconstruction.
Research method used in this research was experiment method with quantitative approach. On the research before land boundary area reconstruction implementation using the combination of GNSS CORS and terretris method was done ally point coordinate transformation (TDT) from DGN 95 referencing ITRF 92 to ITRF 2008 by using Helmert.
The result of coordinate transformation is land boundary area coordinate that will be reconstructed. The data analysis used was
encompassing position accuracy (coordinate) and distance land boundary area difference result from land boundary area reconstruction by the combination of GNSS CORS and terretris method based on Juknis PMNA/KBPN No. 3 in 1997 and t-test with significancy (?) = 5%.
Based on the research result and analysis, it is found that 1) land boundary area reconstruction using the combination of GNSS CORS and terretris method can be done by doing coordinate transformation from DGN 95 referencing on ITRF 92 to ITRF 2008 first and land area coordinate transformation using Helmert method, 2) position (coordinate) land boundary area displacement result
from land boundary area reconstruction with average on 0.042 meter comply with position (coordinate) displacement tolerance condition agree with Juknis PMNA/KBPN No. 3 in 1997 which is 10 cm for settlement area, 25 cm for agriculture area, and from the position (coordinate) land boundary area displacement�s t-test haven�t found a significant difference toward position
(coordinate) displacement result from land boundary area reconstruction using the combination of GNSS CORS and terretris method. The distance land boundary area difference result from the land boundary area reconstruction with average on
0.032 meter comply with dictance difference tolerance condition agree with Juknis PMNA/KBPN No. 3 in 1997 which is 10 cm for settlement area, 25 cm for agriculture area and from distance difference�s t-test haven�t found significance for distance land boundary area difference result from the land boundary area reconstruction using the combination of GNSS CORS and terretris method.

Keywords: Reconstruction, Land Boundary Area, GNSS CORS, Terrestris