Keyword: landuse change and urban growing, RS monitoring
Abstract To effectively protect the agriculture land, the department responsible for
the land resource management of China organize the landuse change and urban
growing monitoring project using remote sensing technique in 100 cities during the
recent 3 years.
The paper describes the landuse change and urban growing monitoring project in
Henan province. The landuse change classification system, the technological process,
the technical methods and data management are presented. Especially the multi-resource
data fusion technique, the change detection technique and landuse change
mapping technique are describe in detail.
It looks clear that the remote sensing monitoring is helpful for the land resource
management. It can objectively provide the quantity and location of landuse change
information, and also can assist to enforce the land law.
1. agriculture land problem in China
In China, with large number of
population and less agriculture land, the
average area of agriculture land is only
47% of the world average level, and
there are about 666 counties whose
average area are lower than 0.8 acre---
the lowest alarm level formulated by the
World Food and Agriculture
Organization. More than, with the
development of economy, the growing
of urban and rural occupy a large
number of agriculture land, followed by
the effect of arid, pollution, salinization
and desertization, the agriculture land
continue to decrease, the amount is high
to 7000,000 acre every year.
The agriculture land is the main source
of the food and closely relates with
people’s lives. President Jiang once
emphasis repeatedly: “Protect
agriculture land is equal to protect our
life line ”. How to control the land
decreasing and protect the land is very
important. But the development of
economy must be ensured at the same
time of protection. So how to protect the
land, and coincide the contradiction
between development & protection
require that the administrators are full
clear with the status of the agriculture
land and the landuse change in our
country, especially the real status of
urban growing. Only based on accurate
numbers, there will be drawn up science
measures.
For many years, the National Land
Bureau relies on the landuse map,
landuse detail investigation materials
and landuse change materials that are
supplied by the local land administrators.
Some problems exist within them, first,
the period of acquiring is too long which
can not be satisfied with the necessary of
the economy development; the second,
some of the data that supplied by local
land administrators may be fault for
their local benefits. So, the new
measures and technique must be taken.
It’s the Remote Sensing technology (RS).
RS can reflect the true image of land and
supply the real information of landuse
and change without any disturbance of
person, more than, it is good at high
speed and short period, and can supply
data as soon as possible.
2. the development and focus of
landuse change and urban
growing monitoring
2.1 the history and status quo of
landuse change and urban
growing monitoring in China
Since the Eighth-five years, the National
Land Bureau begin to do work for the
RS monitoring. From Aug.1996 to
Mar.1997, they organize to finish 17
cities RS monitoring with three period
TM data; In 1997, 100 cities RS
monitoring are completed with 91 and
97 TM data; By the end of 1998, RS
monitoring is done in Zhengzhou,
Taiyuan, Luoyang and other important
cities. This series of experiments truly
reflect the reality of landuse change and
urban growing, and give assistance to
the land administrators; except that, the
perfect technique route and rich
experiences are accumulated in the
works.
In 1998, the National Resource
Department formulate the measure of
“the rule of landuse dynamic Remote
Sensing monitoring”, which will be the
basis for the RS Monitoring in the future.
In 1999, the National Resource
Department plan to do RS Monitoring of
69 cities including 30 provincial capitals,
5 municipalities directly under the
Central Government and others
important cities in order to cooperate
with the investigation of the national
resources. According to the reality of
China, four types of RS Monitoring
period are adopted: municipalities,
developed cities and important cities in
eastern China do every year; important
agriculture zones do every three years;
hills, grassland and forest do every five
years; the desert zones in western China
do every ten years or more.
