In late February, Beijing environmental protection monitoring center "in Beijing's air quality monitoring using remote sensing technology and engineering application of" project was awarded the 2014 second prize of science and technology in Beijing.
During the APEC in 2014, the scientific and technological achievements have come in handy, and in possible future Winter Olympics, it will also provide regional air quality monitoring using remote sensing data in real time.
Remote sensing monitoring of this project starts from 8 years ago, really formed a business capability is in 2012, has been building up coverage in Beijing amounts to 3 years more than 3 levels of more than 60 species of 20TB (computer storage unit) remote sensing database for special products, accumulate in and around Beijing's most complete atmospheric remote sensing data, provide information support for the control of air pollution.
Zhang Dawei, Director of Beijing municipal environmental protection monitoring center will be called remote sensing monitoring air quality monitoring of the third way. There are two traditional ways, the first is to manually monitor, filter air and goop, then weighing, laboratory testing, analysis, draw the composition of particles, pollutants in the air. Second is automatically monitored, there are 35 automatic stations in Beijing, can continuously automatic analyzing the concentration of particulate matter in the air and contaminants. Our ordinary daily PM2.5 data received through a variety of media, from these 35 real-time automatic monitoring stations.
Automatic monitoring stations are now the most common method of monitoring, 16400 square kilometers of area in Beijing but only set up monitoring stations in over more than 6,000 square miles of plains, while more than 10,000 square kilometers of mountains without stations. "This is a general phenomenon in our country, stations concentrated in towns, the vast rural areas, waters, mountains cover less. Air monitoring is a problem throughout the region, require linkage. "Zhang Dawei said.
Remote sensing monitoring in rightly to fill up the problem of uneven distribution of monitoring sites. By using satellite remote sensing data can be more broadly from "surface" observed air quality. And procurement and maintenance costs, said satellite remote sensing than stations economic lot.
Beijing municipal environmental protection monitoring center is air monitoring data, actual, on March 23, Beijing's air quality index was 62, second-level, good. On March 25, the Beijing's air quality index hit 175, four, moderately polluted.
On project functioning principle: different satellites and various sensors, like a special camera was mounted on the satellite, responses of different cameras for different bands. Different substances in different bands of sunlight in the air scattering and absorption effect of different satellite reception to these different bands of the electromagnetic wave, can out of different substances and their concentrations in the air. ”
In June 2014, the project team to Beijing, Tianjin and Hebei and its surrounding area air pollution prevention and control group collaboration delivered remotely sensed data to help them monitor burning straw.
Precise positioning of crop straw burning, just monitoring a small project, it can do much more than that. Using the different characteristics of the satellite data, remote sensing monitoring can also implement the regional vegetation, arable land, wetlands, nature reserves and green monitor. Using high resolution satellite cameras, remote sensing monitor can monitor Beijing concrete mixing station and building of bare land.
Accuracy can be hundreds of metres from the satellite camera in front of the camera, all-concrete mixing station of Beijing fade away. Beijing on the map marks the location of all the concrete mixing station, concrete mixer truck,each cement tanker and silo in, stockpile shed visible, available on the satellite images to determine the working condition of concrete mixing station.
Remote sensing monitoring can clearly identify the core area of Beijing's construction and construction phases, such as demolition and flat stages, the main stage of construction, not green.
In the background of integration of Beijing, Tianjin and Hebei, Beijing buildings in surrounding areas of bare land remote sensing data were also provided to air pollution control in Beijing, Tianjin and Hebei and its surrounding areas collaborating Group Office. Figures show that building in Beijing around bare land and bordering districts areconcentrated in Beijing, Langfang area the most numerous and largest of them, a total of 199, size 10.81 square kilometres; followed by manufacturers, xianghe and Guan.
