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LANDUSE RS MONITORING IN CHINA
Li Yingcheng, Guo Tongying, Li Xueyou, Wang Guangliang, Fu Xiaomei
Chinese Academy of Surveying and Mapping, Beitaiping Road 16, Beijing, 100039
casmrsec(@sina.com
Commission VI, WG VII /3
KEY WORDS: Remote Sensing, land Use, Monitoring, Change Detection, Extraction.
ABSTRACT:
Following rapid development of economy in China, great changes also take place in landuse status, especially in the urban area. In
order to quickly and truly acquire the information of landuse changes and status in quo, aid the government to scientifically manage
the land resource, National Land and Resource Department executes a Landuse RS Monitoring project that began from 1999 and will
keep for 12 years. Based on RS data of multi-sources, multi-resolutions and multi-phases, 93 important cities with more than 500,000
populations are monitored using advanced 3S technologies.
The article introduces the key technologies of landuse monitoring, including ortho-image production, change automatic detection and
fusion methods of multi-sources RS data, etc.
The article focus on describing the working flow as below: (1) Choice of RS data: how to choose the best data from multi-source,
multi-resolution and multi-phase RS data for different aims; (2) Processing of RS data: introduces the rectification model, GCP
distribution rule and fusion method for different RS data; (3) Detection and extraction of changes: introduce the automatically change
detection methods, and semi-automatic change extraction methods; (4) Investigation in the field: introduces the aim and means for
investigation in the fields; (5) Post-processing. In order to get high quality production, the article also gives the reasonable precision
indices for key steps.
Finally, the article points out the problems and gives the prospect of this project.
1. BACKGROUND 2. WORKING AIM
The economy rapidly develops in China these years, great Based on RS, GIS and GPS technologies, combined with the
changes of landuse status take place, especially in the urban. experiences of six years in landuse RS monitoring, the aim of
Most of changes are at the cost of occupation of agriculture this project is to construct a nationwide landuse RS monitoring
land, which is the important base for China that is severely system, which is an systematical engineering integrated the
shortage of agriculture land but with great population. administrative management, function mechanism and
In order to protect agriculture land and control the city growing, technology, and should be satisfied with mass production.
aid the government to scientifically manage the land resource, In the frame of this system, the important objects are as below:
it’s very important to quickly and truly master the landuse € Monitoring landsue change, especial the increase of
changes and status in quo. construction land and the occupation status of agriculture
In 1999, National Land and Resource Department executed a land by construction land.
Landuse RS Monitoring project that will keep for 12 years. In € Updating landuse map with high-resolution image.
this project, 93 important cities with more than 500,000 Except that, the status of urban development and base
populations are monitored with advanced 3S technologies. agriculture land protection are also the monitoring objects,
In the 5 successive years from 1999-2003, more than 250 times further it can be used to check and aid land conversion and
for monitoring 93 cities are finished (figure 1); and more than registration work for local government in land management.
20 units, including academies, institutes and companies, once
took or are just taking into this task.
3. KEY TECHNOLOGIES
Different applications require different data sources and
1999-2003 monitoring cities technologies; therefore bring on corresponding technical
in China standards, production precision indices and others. This article
will give a detail description about RS technologies and
working flow in landuse monitoring (see appendix 1).
28
i
cities
RN
3.1 Choice of RS data and auxiliary materials
d 1999 2000 2001 2002 2003 RS data includes various satellite images and aerial images;
auxiliary materials include topographic map, landuse map and
year DEM, the first two can be used as control material and also be
the reference for information extraction.
This project studies on better choice of RS data from
Figurel. 1999-2003 monitoring cities in China multi-sources, multi-resolutions and multi-phases satellite data
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