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New Generation Sensors and Applications: Airborne Sensing
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Research for development of small-format multi-spectral aerial photographing system
named PKNU 3
Eun-Khung, Lee
Master 2, Pukyong National University, Dept. of Satellite Information Sciences, KOREA,
Telephone: 051)620-6578,
Email: a4004@hanmail
Chul-Uong, Choi
Professor, Pukyong National University, Dept. of Satellite Information Sciences, KOREA,
Telephone: 051)620-6578
Email: cuchoi@pknu.ac.kr
Young-Chan, Seo
Master 2, Pukyong National University, Dept. of Satellite Information Sciences, KOREA,
Telephone: 051)620-6578,
Email: dromond@hanmail.net
Nam-Chun, Cho
Master 1, Pukyong National University, Dept. of Satellite Information Sciences, KOREA,
Telephone: 051)620-6578,
Email: pkphoto78@hotmail.com
ABSTRACT
Originally, to allow for better flexibility in geological and environmental data collection, our
laboratory developed the compact, multi-spectral automatic aerial photographic system called
the PKNU2. This system's multi-spectral camera is capable of recording visible (RGB) and
infrared (NIR) band (3032*2008 pixels) images. Visible and infrared band images were obtained
from each of the two cameras of the PKNU2 respectively and produced color-infrared
composite images to be analyzed for the purpose of the environmental monitoring. However, for
the data this system provides, there is room for improvement. The PKNU2 also has the
limitation of having the stereoscopic overlap area being 60% unsatisfied due to the 12 seconds
of data storage time. However, a distinctive advantage of the PKNU2 system is its ability to
photograph a high number of photos in a short time. Despite its limitations, PKNU2 system
provides an excellent platform upon which an even better system may be built. The advanced
PKNU2 system, designated the PKNU3, consists of a color-infrared spectral camera that can
photograph in the visible and near-infrared bands simultaneously utilizing a single sensor, a
thermal infrared camera, two computers of 120 gigabyte memory capacity to store images, and
an MPEG board that can compress and transfer data to the computer in real-time as well as have
the capability of utilizing a helicopter platform.
1. Introduction
The small-format aerial photographing system, designated the PKNU2, started development in
June, 2001 and has completed its 6 th test on June, 2003 by the PE&RS Lab.(Remote Sensing
Center) in Pukyong National University, Korea. This system was created for the purpose of
obtaining useful data at low-cost along with high accuracy of spatial resolution at the target area
in a timely manner for users. The Ortho photo map (planimetric accuracy: 0.78m, vertical
accuracy: 0.83m) was produced as a test of the basic ability of PKNU2 to integrate with a GPS
survey as well as to verify and calibrate the camera lens. A shortcoming existed that perfect R,G,
B, and IR composite images could not be obtained because the RGB and infrared images were
taken with separate cameras, requiring that the color-infrared composite images were to be
produced in the post processing stage; although vertical photos with spatial-resolutions as high
as 0.29m could be obtained using the PKNU 2. Thus, the objective of the PKNU3 was to
enhance its Multi-spectral aerial photography capability while leaving the PKNU 2 to develop
further into a high spatial-resolution photography platform.
This paper describes the development of the small-format multi-spectral aerial photography
system designated the PKNU 3. The PKNU 3 is composed of 2 parts: a sensor portion con
sisting of a spectral camera that capable of taking images of the R, G, B, and IR bands si
multaneously as well as a thermal IR camera, and a data storage system (figure 1).
Figure 1 Multi-spectral aerial photographing system & platform
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