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Remote Sensing Technology and Application  2000, Vol. 15 Issue (4): 241-245    DOI: 10.11873/j.issn.1004-0323.2000.4.241
    
Prospects of Applying RS,GIS and GPS Technologies to Agricultural Development in the Northwest of China
WANG Peng-xin1, GONG Jian-ya1,LI Xiao-wen2
(1.National Laboratory for Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan430079,China;2.Department of Resource and Environment Sciences,Beijing Normal University,Beijing100875,China)
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Abstract  

 Remote sensing (RS), geographic information system (GIS) and global positioning system
(GPS), known as ' 3S' technologies, can be applied to agricultural fields separately or in combinations.
These technologies are used to obtain multidimensional information, especially for temporal series, in
agricultural production systems, to manage and process spatial and attribute data comprehensively, to
propose related information for agricultural decision-makers and farmers, and further to provide guidelines
for the regional agricultural production and sustainable development. In this paper, the prospects of
applying these technologies to develop agricultural production in the Northwest of China were discussed.
The discussions were centralized on retrievals of land surface temperature and soil moisture, and on
monitoring of drought occurrence and desertification dynamically, and on management of the data as well.
Most areas of the Northwest China belong to arid and semi-arid areas where rainfall is low and with uneven
spatial and temporal distributions. Rainfed agriculture is popular in the region. Many field studies showed
that there are two main constraints for the region' s agricultural development, one is the shortage of soil
water supply and another is that soil fertility is low. The soil water shortage is often occurred over a large
area, therefore, the only way to monitor the shortage and to estimate its extent is using remote sensing
technology. For bare soil or soil with sparse vegetation coverage, remotely sensed data can be used to
model soil thermal inertia, and further to model soil moisture. Taking NOAA advanced very high
resolution radiometer (AVHRR) data as a example, firstly, channel 1 (0.58~0.68μm) and channel 2 (0.
72~1.10μm) can be used to retrieve soil surface albedo, and for channel 4 (10.3~11.3μm) and channel
5 (11.5~12.50μm) to retrieve land surface temperature by the so-called spilt window technology.
Secondly, a model of soil real thermal inertia was established based on solving near-surface conductive heat
transfer equation by applying Fourier series method. And finally, an empirical or semi-empirical relation
between soil surface moisture and soil thermal inertia can be found by applying regression approaches. For
the vegetation covered areas, different indices, such as Normalized Difference Vegetation Index (NDVI),
Vegetation Condition Index (VCI), Temperature Condition Index (TCI) and Anomaly Vegetation Index
(AVI), were also explored from AVHRR data, and these indices can be used to monitor drought
occurrence.The Northwest of China located in the inland of Eurasia, soil wind and water erosions are very
serious in the region, therefore, soil/land desertification is also occurred extensively, especially in the arid
areas caused by wind erosion and in the semi-arid areas of the Loess Plateau caused by water runoff. It is
very useful to investigate the gradation of desertification and as well as to study the spatial and temporal
distributions of desertification by using satellite remotely sensed images. For images with low spatial
resolution, such as AVHRR, they can be used to monitor desertification over a large area during a long
period, and for high spatial resolution image data, such as Landsat, these data can be used to monitor
desertification in a relatively small area in detail.GPS technology can be applied to acquiring precision
positions when field surveys are carried out or remotely sensed missions are implemented. While GIS
technology is an effective tool for storing, analyzing, managing and updating of spatial and attribute data,
including remotely sensed data and GPS acquired data.

Key words:  ‘3S’Technologies      Soil moisture      Drought      Desertification      Agricultural Development      The
Northwest of China
     
Received:  29 June 2000      Published:  23 February 2012
TP 79/P 208  
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Cite this article: 

WANG Peng-xin, GONG Jian-ya,LI Xiao-wen. Prospects of Applying RS,GIS and GPS Technologies to Agricultural Development in the Northwest of China. Remote Sensing Technology and Application, 2000, 15(4): 241-245.

URL: 

http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2000.4.241     OR     http://www.rsta.ac.cn/EN/Y2000/V15/I4/241


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