Accuracy Comparison of Direct Georeferencing and Indirect Georeferencing in the Mobile Mapping System

  • Bae Sang-Keun (Department of Geoinformatic Engineering, Inha University) ;
  • Kim Byung-Guk (Department of Geoinformatic Engineering, Inha University) ;
  • Sung Jung-Gon (Highway Research Department, Korea Institute of Construction Technology)
  • Published : 2004.10.01

Abstract

The Mobile Mapping System is an effective method to acquire the position and image data using vehicle equipped with the GPS (Global Positioning System), IMU (Inertial Measurement Unit), and CCD camera. It is used in various fields of road facility management, map update, and etc. In the general photogrammetry such as aerial photogrammetry, GCP (Ground Control Point)s are needed to compute the image exterior orientation elements (the position and attitude of camera). These points are measured by field survey at the time of data acquisition. But it costs much time and money. Moreover, it is not possible to make sufficient GCP as much as we want. However Mobile Mapping System is more efficient both in time and money because it can obtain the position and attitude of camera at the time of photographing. That is, Indirect Georeferencing must use GCP to compute the image exterior orientation elements, but on the other hand Direct Georeferencing can directly compute the image exterior orientation elements by GPS/INS. In this paper, we analyze about the positional accuracy comparison of ground point using the Direct Georeferencing and Indirect Georeferencing.

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