Despite significant physical deterioration and the absence of comprehensive digital documentation, Sumenep Palace remains an important architectural and historical heritage site. The goal of this paper is to propose a digital conservation scheme using augmented reality technology. The system integrates photogrammetry, LiDAR scanning, and manual measurements to produce accurate three-dimensional (3D) models. These models, freely available on Android devices, were implemented in an augmented reality (AR) application we developed, using marker-based (QR code) tracking. Testing showed object loading times ranging from 8 seconds to 11 minutes, depending on the number of models, highlighting the need to optimize geometry for mobile AR. The resulting program functions both as a conservation database and as an interactive, accessible tool for teaching history. This approach can serve as a replicable template for other heritage sites in Indonesia, while also demonstrating the potential of augmented reality as a means of protecting digital cultural assets.
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