การประเมินความถูกต้องของการจัดทำแผนที่ด้วยอากาศยานไร้คนขับด้วยการกำหนดรูปแบบจุดควบคุมภาคพื้นดินที่โครงการแก้มลิงทุ่งปากขอ จังหวัดสุราษฎร์ธานี

Wisuwat Taesombat; Patpong  Tipchit

Authors

Wisuwat Taesombat Department of Irrigation Engineering, Faculty of Engineering at Kamphaengsaen, Kasetsart University Kamphaengsaen Campus
Patpong Tipchit Department of Irrigation Engineering, Faculty of Engineering at Kamphaengsaen, Kasetsart University Kamphaengsaen Campus

Keywords:

aerial photograph , ground control point , RMSE, geospatial positioning accuracy , digital surface model

Abstract

This research aimed to determine appropriate distribution pattern of ground control points affected on the geospatial positioning accuracy for mapping by UAV photogrammetry. Thung Pak Kor Detention Area Project, Suratchthani Province was selected as the study area which covered an area of approximately 0.6 km². It started with the data collection of aerial imagery data from UAV photogrammetry with 80% overlap and 60% side lap of the aerial imagery, and 41 ground data collection points divided into 24 ground control points and 17 accuracy check points. Aerial imagery was then processed using six distribution patterns of ground control points consisting of edge distribution, grid distribution, x-distribution, circle distribution, random distribution, and group distribution. Each pattern uses 8 ground control points to determine the geospatial positional accuracy and appropriate distribution patterns for the study area. The results showed that the x-distribution pattern provides the best horizontal and vertical accuracy with an RMSE_r of 0.135 m and an RMSE_z of 0.116 m, respectively. It has a horizontal reliability of 0.234 percent, a vertical reliability of 0.227 percent, and it can produce maps with a scale of 1:400.

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