TRIDIPA BISWAS - Academia.edu (original) (raw)

Papers by TRIDIPA BISWAS

Research paper thumbnail of Ensembling machine learning models to identify forest fire-susceptible zones in Northeast India

Ecological informatics, Apr 1, 2024

Research paper thumbnail of COVID 19 Lockdown -Air Quality Reflections in Indian Cities

Aerosol and Air Quality Research, 2021

The emergence of COVID-19 put pressure on the Governments of most of the countries in the world t... more The emergence of COVID-19 put pressure on the Governments of most of the countries in the world to enforce nationwide lockdown (restriction of all non-essential activities) to curtail the spread of infection. The nationwide lockdown created an adverse impact on the economies around the world and altered the day-today life of people. The restrictions on pollution generating activities during the lockdown period resulted in an overall improvement of the air quality throughout the world including India. This study evaluated the impact on air quality in 46 cities throughout India and the findings indicate that on average, PM2.5 and NOx, concentrations reduced by about 34% and 60%, respectively at different locations in India. PM2.5 concentrations reduced by about 23%, 16%, 32%, and 28% in small, medium, large and megacities, respectively. However, the reduction in NOx concentrations was dissimilar to PM2.5 in these cities. The findings further suggested that the impact of lockdown on air quality was not homogenous across the country and was probably due to varying background contributions. The average concentrations of PM2.5 and NOx at background stations were found higher in large and mega cities than the smaller cities. The PM2.5 concentrations at background stations were higher in North India in comparison to other parts of India.

Research paper thumbnail of Satellite Photogrammetry for DEM Generation Using Stereo Pair and Automatic Extraction of Terrain Parameters

Int. Journal of Advances in Remote Sensing and GIS, Feb 25, 2016

Abstract: A Digital Elevation Model (DEM) is a representation of a land surface in a 3 dimensiona... more Abstract: A Digital Elevation Model (DEM) is a representation of a land surface in a 3 dimensional space with elevation as the third dimension along X (horizontal coordinates) and Y (vertical coordinates) dimensions. DEM is a useful data source in hilly areas terrain analysis; DEM plays an important role in various areas like disaster management, hydrology and watershed management, geomorphology, urban development, map creation and resource management etc. Cartosat 1 or IRS P5 (Indian Remote Sensing Satellite) is a state of the art remote sensing satellite developed and launched by ISRO (May 5, 2005). It has been designed for terrain modeling and large scale mapping applications. This high resolution stereo data has great potential to produce high quality DEM. The high resolution Cartosat 1 stereo image data is capable to provide significant impact in topographic mapping and watershed applications. The objective of the present study is to generate high resolution DEM (10 m and 30 m) and ortho rectified image through Cartosat 1 stereo pair, quality evaluation in different elevation strata, generation of terrain parameters. Aglar watershed in Tehri Garhwal and Dehradun district has been used as the test site. The present study reveals that DEM generated (10 m and 30 m) using CARTOSAT 1 stereo pair is of high quality. The derived terrain parameters like slope, aspect, drainage, watershed boundaries etc., are also of good quality. A comparison of the DEM and the parameter derived from it reveals significant improvement in the quality as compared to the freely available DEM in internet.

Keywords: ASTER DEM, CARTO DEM, CARTOSAT 1, Digital Elevation Model, Ortho rectified Image, Photogrammetry, Rational Polynomial Coefficient, Stereo Pair, Terrain Parameters.

Drafts by TRIDIPA BISWAS

Research paper thumbnail of FOREST RESTORATION AND CONSERVATION METHODS IN ARUNACHAL PRADESH: A CASE STUDY OF NAMDAPHA NATIONAL FOREST

ENVIS Newsletter on Himalayan Ecology, 2022

Research paper thumbnail of Environmental Assessment of Tourism in the Indian Himalayan Region

Research paper thumbnail of WILD BEE KEEPING & ITS POTENTIAL FOR ECONOMIC PROSPERITY IN ARUNACHAL PRADESH

ENVIS Newsletter, 2022

contribution to raising awareness of the importance and role of pollination in ecosystem function... more contribution to raising awareness of the importance and role of pollination in ecosystem functioning and its impact on people's well-being. His work also promotes biodiversity, healthy food production, and a higher standard of living. These statements demonstrate the bees' plight and the threat of extinction. REFERENCES Ascher JS, Pickering J (2020). Discover Life bee species guide and world checklist (Hymenoptera: Apoidea: Anthophila). http://www.discoverlife.org/mp/20q?guide=Apoidea_species. Gupta RK (2003). The diversity of bees (Hymenoptera, Apoidea) in India. Advancements in insect biodiversity. Agrobios (India). x, pp.1-337.

Research paper thumbnail of Ensembling machine learning models to identify forest fire-susceptible zones in Northeast India

Ecological informatics, Apr 1, 2024

Research paper thumbnail of COVID 19 Lockdown -Air Quality Reflections in Indian Cities

Aerosol and Air Quality Research, 2021

The emergence of COVID-19 put pressure on the Governments of most of the countries in the world t... more The emergence of COVID-19 put pressure on the Governments of most of the countries in the world to enforce nationwide lockdown (restriction of all non-essential activities) to curtail the spread of infection. The nationwide lockdown created an adverse impact on the economies around the world and altered the day-today life of people. The restrictions on pollution generating activities during the lockdown period resulted in an overall improvement of the air quality throughout the world including India. This study evaluated the impact on air quality in 46 cities throughout India and the findings indicate that on average, PM2.5 and NOx, concentrations reduced by about 34% and 60%, respectively at different locations in India. PM2.5 concentrations reduced by about 23%, 16%, 32%, and 28% in small, medium, large and megacities, respectively. However, the reduction in NOx concentrations was dissimilar to PM2.5 in these cities. The findings further suggested that the impact of lockdown on air quality was not homogenous across the country and was probably due to varying background contributions. The average concentrations of PM2.5 and NOx at background stations were found higher in large and mega cities than the smaller cities. The PM2.5 concentrations at background stations were higher in North India in comparison to other parts of India.

Research paper thumbnail of Satellite Photogrammetry for DEM Generation Using Stereo Pair and Automatic Extraction of Terrain Parameters

Int. Journal of Advances in Remote Sensing and GIS, Feb 25, 2016

Abstract: A Digital Elevation Model (DEM) is a representation of a land surface in a 3 dimensiona... more Abstract: A Digital Elevation Model (DEM) is a representation of a land surface in a 3 dimensional space with elevation as the third dimension along X (horizontal coordinates) and Y (vertical coordinates) dimensions. DEM is a useful data source in hilly areas terrain analysis; DEM plays an important role in various areas like disaster management, hydrology and watershed management, geomorphology, urban development, map creation and resource management etc. Cartosat 1 or IRS P5 (Indian Remote Sensing Satellite) is a state of the art remote sensing satellite developed and launched by ISRO (May 5, 2005). It has been designed for terrain modeling and large scale mapping applications. This high resolution stereo data has great potential to produce high quality DEM. The high resolution Cartosat 1 stereo image data is capable to provide significant impact in topographic mapping and watershed applications. The objective of the present study is to generate high resolution DEM (10 m and 30 m) and ortho rectified image through Cartosat 1 stereo pair, quality evaluation in different elevation strata, generation of terrain parameters. Aglar watershed in Tehri Garhwal and Dehradun district has been used as the test site. The present study reveals that DEM generated (10 m and 30 m) using CARTOSAT 1 stereo pair is of high quality. The derived terrain parameters like slope, aspect, drainage, watershed boundaries etc., are also of good quality. A comparison of the DEM and the parameter derived from it reveals significant improvement in the quality as compared to the freely available DEM in internet.

Keywords: ASTER DEM, CARTO DEM, CARTOSAT 1, Digital Elevation Model, Ortho rectified Image, Photogrammetry, Rational Polynomial Coefficient, Stereo Pair, Terrain Parameters.

Research paper thumbnail of FOREST RESTORATION AND CONSERVATION METHODS IN ARUNACHAL PRADESH: A CASE STUDY OF NAMDAPHA NATIONAL FOREST

ENVIS Newsletter on Himalayan Ecology, 2022

Research paper thumbnail of Environmental Assessment of Tourism in the Indian Himalayan Region

Research paper thumbnail of WILD BEE KEEPING & ITS POTENTIAL FOR ECONOMIC PROSPERITY IN ARUNACHAL PRADESH

ENVIS Newsletter, 2022

contribution to raising awareness of the importance and role of pollination in ecosystem function... more contribution to raising awareness of the importance and role of pollination in ecosystem functioning and its impact on people's well-being. His work also promotes biodiversity, healthy food production, and a higher standard of living. These statements demonstrate the bees' plight and the threat of extinction. REFERENCES Ascher JS, Pickering J (2020). Discover Life bee species guide and world checklist (Hymenoptera: Apoidea: Anthophila). http://www.discoverlife.org/mp/20q?guide=Apoidea_species. Gupta RK (2003). The diversity of bees (Hymenoptera, Apoidea) in India. Advancements in insect biodiversity. Agrobios (India). x, pp.1-337.