Akurasi dan Efektivitas Block Adjustment Menggunakan Titik Kontrol Peta Foto untuk Peningkatan Kualitas Data Bidang Tanah Studi Kasus di Kabupaten Sleman

Perkasa, Desga and Nugroho, Tanjung and Widiyantoro, Susilo (2025) Akurasi dan Efektivitas Block Adjustment Menggunakan Titik Kontrol Peta Foto untuk Peningkatan Kualitas Data Bidang Tanah Studi Kasus di Kabupaten Sleman. Kadaster: Journal of Land Information Technology, 3 (1).

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Abstract

This study analyzes the accuracy and effectiveness of block adjustment in improving cadastral data quality by comparing two sources of control points: field measurements using GNSS Real Time Kinematic (RTK) and the interpretation of high-resolution aerial photomaps. The main issue addressed is the inconsistency of parcel coordinates in the PTSL program, particularly in areas that are difficult to access. This research fills the gap by evaluating the use of photomap control points as a practical alternative. The study was conducted in Banyuraden Village, Sleman Regency, involving 72 land parcels across three blocks. Data were quantitatively processed using the PEREKAT plugin in QGIS. Photomap control points had a resolution of GSD ≤ 0.12 m and positional accuracy of CE90 ≤ 0.4 m. Distance and area accuracy tests referred to PMNA/KBPN No. 3/1997 and ATR/BPN Regulation No. 21/2019, while effectiveness was assessed using a tolerance of 5% of the survey plan area. The results indicate that validation effectiveness using photomap control points reached 86.57%, compared to 88.06% with field-based control points. Both values fall within the “highly effective” category (ratio ≥ 80%). The small difference in effectiveness highlights that photomap control points can serve as an efficient alternative for cadastral mapping in hard-to-reach areas and support the acceleration of digital land administration services. Keywords: Block Adjustment, Photomap Accuracy, GNSS RTK, PTSL, Digital Land Administration

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