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A step by step representation of Remote Sensing Process for obtaining outputs Source:https://www.google.co.in/url?sa=i&source=imgr es&/remotesensing/process
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Increase in extreme events due to recent climatic pattern at a global scale has led to ecosystem loss and imbalance. This may further accelerate global warming and eventually threat on sustenance of life on this planet earth India is a land of mega biodiversity with different landforms. However, increasing pressure from the population may drive the...
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Context 1
... ecologists start using satellite remote sensing data as an important aid to derive the environment parameters for ecological process in large geographical areas. Because it enables to derive land use and land cover information of large areas, Hence, remote sensing become a potential area in the field of ecology (Aplin, 2005) ( Figure 3). The Landsat satellite data are available since 1972, therefore time -space analysis is possible and have been successfully used to classify the whole world into different classes. The Landsat data are made available by USGS. Since availability, Landsat satellite data (Figure 4) has been used successfully in forest management and conservation across the world, fire mapping, identifying disturbance regime areas and detection of changes in density of forest cover, assessment of biomass, restoration of disturbed and deforested areas of the ...
Context 2
... ecologists start using satellite remote sensing data as an important aid to derive the environment parameters for ecological process in large geographical areas. Because it enables to derive land use and land cover information of large areas, Hence, remote sensing become a potential area in the field of ecology (Aplin, 2005) ( Figure 3). The Landsat satellite data are available since 1972, therefore time -space analysis is possible and have been successfully used to classify the whole world into different classes. ...
Citations
... Remote Sensing process(Singh et al., 2018) Electromagnetic radiation (EM) is a disturbance of electric and magnetic field.it passes the information at the speed of light.it ...
The Tejgaon Industrial Area, located in Dhaka, the capital of Bangladesh, was founded in the 1950s. Tejgaon was planned in 1986 as a light industrial area. In the postliberation period, Tejgaon Industrial Area became the main attraction of industrial activities. From the beginning of creation, Tejgaon industrial area was developed with the possibility of becoming a state-of-the-art industrial area, but it could not be developed as a state-of-the-art industrial area due to lack of planning. Since the inception of Tejgaon Industrial Area, no far-sighted plan has been formulated for the treatment of industrial effluent. As a result, the environment of Tejgaon industrial area has been repeatedly threatened. Prior to 2000 and for the next ten years or so, the Begunbari Canal (now Hatirjheel Lake) adjacent to the Tejgaon industrial area was used to discharge polluted and environmentally harmful wastewater from the Tejgaon industrial area. As a result of which this canal is terribly polluted. This water from Begunbari canal used to mix with the water of Rampura canal and flow into Balu River.
As a result, the Balu River was also polluted in a terrible way. The canal was once almost dead due to illegal construction of various permanent and temporary structures and slums on the site of the canal. After the completion of Hatirjheel project, this condition was improved and Begunbari canal was revived. As Hatirjheel was larger than the volume of Begunbari canal at that time, it increased the capacity of waste water.
Apart from treatment of waste water of Tejgaon industrial area, Hatirjheel has done a very important hydrological work for drainage and retention of storm water in Dhaka city. The main focus of this research work was to compare various environmental parameters of Tejgaon Industrial Area and Hatirjheel Lake in the last 20 years through evaluation remote sensing and to find out what changes are taking place in the environment and the reasons behind it.
Remote sensing provides an idea of the nature and variability of electromagnetic radiation in terms of wavelength and frequency. By observing the data of the satellite platform through remote sensing, instantaneous changes can be observed without leaving contact with the surface of the earth. This is exactly what has been done in this study. The Satellite data for Landsat 5 TM and Landsat 7 ETM+ were downloaded from the United States Geological Survey (USGS) websites using the path and row numbers 137 and 44, respectively. Analysis images taken at 4-year intervals from 2000 to 2021
were being used to track the impact. Land Surface Temperature (LST) and Normalized Difference Vegetation Index (NDVI) have been used to monitor the changes in Tejgaon Industrial Area. Hatirjheel Lake changes were observed using 4 indexes - Total Suspended Matter (TSM), Chlorophyll-a (chl-a), Turbidity (TNTU) and Land Surface Temperature (LST), respectively.
From the LST analysis, average temperature of Tejgaon Industrial Area has decreased from 25.585 ℃ in 2000 to 24.67 ℃ in 2021. Average temperature of Hatirjheel Lake has also decreased from 22.795 ℃ in 2000 to 21.55 ℃ in 2021. From the NDVI analysis, it is observed that Water body of Tejgaon Industrial Area has fallen 23.07% to 0% in 20 years interval. Build up area percentage has rose to 91.5% from 33.10% in this 20 years interval. Barren Land has decreased to 6.9% from 10.82% in 20 years interval. In 20 years interval, Dense Vegetation has decreased to 0% from 8.52%, Sparse Vegetation has decreased to 0% from 8.73%, and Grassland has decreased to 1.7% from 15.76%. From TSM analysis, it is observed that, average value of Hatirjheel Lake has decreased 44003.215 mg/l to 16089.866 mg/l in 20 years interval. The average concentration of Chlorophyll-a and Turbidity was increased rapidly in 20 years. The concentration of Chlorophyll-a has increased by 15 mg/l to 164 mg/l in 20 years.
Turbidity has increased by 24 NTU to 45 NTU in 20 years.
