Abstract
In conducting land boundary verification surveys in digitalized cadastral areas in Taiwan, possible parcel points must be surveyed. These points are employed in the overlap analysis and map registration of possible parcel points and digitalized cadastral maps to identify the coordinates of parcel points. Based on the computed horizontal distance and angle between control points and parcel points, parcels are staked out using ground surveys. Most studies survey possible parcel points using ground surveys with, for example, total stations. Compared with ground surveys, UAV (Unmanned Aerial Vehicle) aerial photogrammetry can provide more possible parcel points. Thus, an overlap analysis of digitalized cadastral maps, combined with the collection of possible parcel points, will be more comprehensive. In this study, a high-quality-medium format camera, with a 55 mm focal length, was carried on a rotary UAV to take images, with a 3 cm ground sampling distance (GSD), flying 300 m above the ground. The images were taken with an 80% end-lap and side-lap to increase the visibility of the terrain details for stereo-mapping. According to the test conducted in this study, UAV aerial photogrammetry can accurately provide supplementary control points and assist in the boundary verification of digitalized cadastral areas in Taiwan.
Highlights
Boundary verification surveys determine the officially recognized boundaries of people’s property
Depending on the survey method and the way cadastral maps are stored in Taiwan, they can be categorized into digital cadastral areas, graphic cadastral areas, and digitalized graphic cadastral areas
While graphic cadastral maps have been digitalized as digitalized graphic cadastral maps, they still cannot shield the original maps from differential shrinkage, wrinkles, folds, and damage and give rise to problems, such as a difference between maps and land details in the real world, map joins, and changes to an area after map registration [1]
Summary
Boundary verification surveys determine the officially recognized boundaries of people’s property. Based on the assumption that terrain objects are visible in UAV images, agricultural land test areas were selected from three different UAV data sources for testing Their methods for verifying the cadastral boundaries proved that the cadastral mapping process could be automated. Compared to ground survey methods using total stations or GNSS systems, which can only collect the possible parcel points in a local area, UAV aerial photogrammetry can provide many more possible parcel points and generate orthoimages. UAV aerial photogrammetry can obtain the coordinates of distinct terrain object points, e.g., road corners or roof corners, as supplementary control points by space intersection using multiple bundles of photogrammetry For these reasons, this study focuses on the use of UAV aerial photogrammetry in a survey for the boundary verification of urban digitalized cadastral areas in Taiwan. The aim is to produce the coordinates of supplementary control points using UAV aerial photogrammetry and verify the feasibility of the survey for boundary verification using UAV aerial photogrammetry
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