In Poland, the land and building records (EGiB) function as real estate cadastre, and are subject to periodic and on-going updating in accordance with applicable regulations. In addition to upgrades aimed at bringing the field status in line with the registration status, land and building records’ modernizations are also being carried out. The purpose of modernization is to improve the quality of collected data as well as their standardization and harmonization. Modernization works can be carried out through field measurements or the use of photogrammetric technology. The purpose of this publication is to clarify the problems associated with determining the boundaries of registration plots in the context of modernization works performed using the photogrammetric method. The paper includes an assessment of technical and legal aspects related to the above-mentioned tasks.