FIRST EXPERIENCE OF IMU/DGPS-SUPPORTED PHOTOGRAMMETRY
IN CHINA
Li Xueyou“, Li Yingcheng®, Zhao Jicheng*, Gong Xunping?, Tang Liang"
“ Chinese Academy of Surveying & Mapping, 16 Beitaiping Road, Beijing, 100039, P.R. of
China,casmphrs@public3.bta.net.cn
S Techedge GmbH Consulting & Software, Schlehenring 18B, 85551 Kirchheim Germany, tang@techedge.de
Commission I, WG I/5
KEY WORDS: Differential Global Position System (DGPS), Inertial Measurement Unit (IMU), Direct Georeferencing (DG),
Integrated Sensor Orientation (ISO), Photogrammetric Processing and Production
ABSTRACT:
People's Republic of China is one of the most rapidly developing countries in the world today. There is a great demand on highly actual
and accurate spatial information of the whole country, especially of West China which becomes the focus of development of the Chinese
government right now and in the next years, but where still not enough topographic maps are available. This raises great challenges to the
surveying and mapping community in China. Facing the new challenges the Chinese Academy of Surveying and Mapping (CASM)
started its pioneer work early 2002 to explore new techniques and technologies available today toward increasing the map productivity.
With import of a CCNS/AEROcontrol system in November 2002, the first DGPS/IMU-based photogrammetric project in China was
successfully accomplished jointly by CASM, the Germany-based companies IGI and Techedge. Two photogrammetric blocks of 1:4,000
and 1:20,000 photo scales, respectively, were flown in Anyang, China. Direct georeferencing and integrated sensor orientation were
conducted. Results achieved were proven by using ground checkpoints and compared with those of aerial triangulation. Orthophotos
generated based on direct georeferencing shows the high efficiency and quality, and thus proved the promise of the new technology.
Furthermore several DGPS/IMU-based photogammetric projects was accomplished one by one and a big project of more than 100,000
km2 in the Inner Mongolia will be started in August 2003. The paper presents experiences with DGPS/IMU-based photogrammetry in
China. Results achieved in concrete projects are shown and evaluated. Politic and technical specialties in China are discussed.
Conclusions outline the potential of DGPS/IMU-based photogrammetric production in China.
1. INTRODUCTION 1:500,000 252 252 100%
1:1,000,000 77 77 100%
People’s Republic of China is one of the most rapidly developing
countries in the world today. There is a great demand on highly
actual and accurate spatial information of the whole country,
especially of West China which becomes the focus of
development of the Chinese government right now and in the next
years, but where still not enough topographic maps are available.
According to the State Bureau of Surveying and Mapping of
China (SBSM) there are nation-wide still quite a few territories
(mainly in West China) without maps of 1:10,000, 1:25,000 and
1:50,000 scale, and about one-third of the available maps were
produced based on aerial photographs taken in the seventies and
the eighties of the last century (Table 1). This cannot keep up
with the situation of rapid development in China and raises great
challenges to the Chinese surveying and mapping community
Table 1. Overview of nation-wide map production of China
(from Web-SBSM, 2003).
On the other side, large scale maps are highly demanded in the
well developed regions, e.g. the coastal area in the east of China.
Information contents have even to be updated frequently since
changes may occur so rapidly in months, weeks and even days.
According to a recent news report, e.g. in Beijing, you may find
every 7 days a new several-stories high building constructed. It is
quite hard job for the Chinese surveying and mapping community
right now to keep up with such a speed of development, although
there are more than 260,000 professionals working in the country.
With the latest development in techniques and technologies
med digital processing has already replaced analytical plotting in the
photogrammetric production of China since the nineties of the
: E Et - last century. Each provincial Bureau of Surveying and Mapping is
Map seals No CEmpis) No. of Gi 2 Ke well Hii with a large number of e MERE
She read Sheets available rs photogrammetric workstations (DPWS). Once digital or digitized
10.000 SE, UE ; 3 images are available, the automated photogrammetric production
[33.000 20308 23525 2095 is carried out. Automation of major photogrammetric procedures
1:50,000 24091 19297 80% replaces the most time-consuming labor work by computers, and
1:100,000 6170 6170 100% thus, speeds up the entire production considerably already.
1:250,000 819 819 100% However, there are still some major obstacles to the efficiency of
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