Cadastrial survey, the management of cadastrial official book and a title to land, demonstrated in the law of establishment and management for GIS, is to determine coordinates, area and boundary of a land for enrollment of a land to cadastrial official book and re-constructure enrolled boundary point on the ground, and to include confirmation surveying for cadastral and renovation of cadastre . confirmation surveying for cadastral and renovation of cadastre are details of cadastrial survey in order to enroll new lands. New enrollment of lands is aimed to exactly enroll a boundary point, so every coordinate of all points should be surveyed and enrolled which takes long time. Also it is more difficult for a wide area with a loss of time and economy, especially compartmentalized and resurvey areas. I expect that ortho image will contribute to minimized the loss comparing to directly obtain coordinates of every boundary point. But accuracy and precision of ortho image should be acquired. ortho image from a drone is not meaningfully without accuracy and precision. This research is to compare data from ortho image and R.T.K. survey and to judge accuracy and precision, and then to decide whether to apply results from ortho image to real confirmation surveying for cadastral and renovation of cadastre.