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Urbanization is an increasing phenomenon around the world, causing many adverse effects in urban areas. Urban heat island is are of the most well-known phenomena. In the present study, surface urban heat islands (SUHI) were studied for seven megacities of the South Asian countries from 2000–2019. The urban thermal environment and relationship between land surface temperature (LST), land use landcover (LULC) and vegetation were examined. The connection was explored with remote-sensing indices such as urban thermal field variance (UTFVI), surface urban heat island intensity (SUHII) and normal difference vegetation index (NDVI). LULC maps are classified using a CART machine learning classifier, and an accuracy table was generated. The LULC change matrix shows that the vegetated areas of all the cities decreased with an increase in the urban areas during the 20 years. The average LST in the rural areas is increasing compared to the urban core, and the difference is in the range of 1–2 (°C). The SUHII linear trend is increasing in Delhi, Karachi, Kathmandu, and Thimphu, while decreasing in Colombo, Dhaka, and Kabul from 2000–2019. UTFVI has shown the poor ecological conditions in all urban buffers due to high LST and urban infrastructures. In addition, a strong negative correlation between LST and NDVI can be seen in a range of −0.1 to −0.6.
Talha Hassan; Jiahua Zhang; Foyez Ahmed Prodhan; Til Prasad Pangali Sharma; Barjeece Bashir. Surface Urban Heat Islands Dynamics in Response to LULC and Vegetation across South Asia (2000–2019). Remote Sensing 2021, 13, 3177 .
AMA StyleTalha Hassan, Jiahua Zhang, Foyez Ahmed Prodhan, Til Prasad Pangali Sharma, Barjeece Bashir. Surface Urban Heat Islands Dynamics in Response to LULC and Vegetation across South Asia (2000–2019). Remote Sensing. 2021; 13 (16):3177.
Chicago/Turabian StyleTalha Hassan; Jiahua Zhang; Foyez Ahmed Prodhan; Til Prasad Pangali Sharma; Barjeece Bashir. 2021. "Surface Urban Heat Islands Dynamics in Response to LULC and Vegetation across South Asia (2000–2019)." Remote Sensing 13, no. 16: 3177.
Drought has devastating impacts on agriculture and other ecosystems, and its occurrence is expected to increase in the future. However, its spatiotemporal impacts on net primary productivity (NPP) in Mongolia have remained uncertain. Hence, this paper focuses on the impact of drought on NPP in Mongolia. The drought events in Mongolia during 2003–2018 were identified using the Moderate Resolution Imaging Spectroradiometer (MODIS) normalized difference vegetation index (NDVI). The Boreal Ecosystem Productivity Simulator (BEPS)-derived NPP was computed to assess changes in NPP during the 16 years, and the impacts of drought on the NPP of Mongolian terrestrial ecosystems was quantitatively analyzed. The results showed a slightly increasing trend of the growing season NPP during 2003–2018. However, a decreasing trend of NPP was observed during the six major drought events. A total of 60.55–87.75% of land in the entire country experienced drought, leading to a 75% drop in NPP. More specifically, NPP decline was prominent in severe drought areas than in mild and moderate drought areas. Moreover, this study revealed that drought had mostly affected the sparse vegetation NPP. In contrast, forest and shrubland were the least affected vegetation types.
Lkhagvadorj Nanzad; Jiahua Zhang; Battsetseg Tuvdendorj; Shanshan Yang; Sonam Rinzin; Foyez Prodhan; Til Sharma. Assessment of Drought Impact on Net Primary Productivity in the Terrestrial Ecosystems of Mongolia from 2003 to 2018. Remote Sensing 2021, 13, 2522 .
AMA StyleLkhagvadorj Nanzad, Jiahua Zhang, Battsetseg Tuvdendorj, Shanshan Yang, Sonam Rinzin, Foyez Prodhan, Til Sharma. Assessment of Drought Impact on Net Primary Productivity in the Terrestrial Ecosystems of Mongolia from 2003 to 2018. Remote Sensing. 2021; 13 (13):2522.
Chicago/Turabian StyleLkhagvadorj Nanzad; Jiahua Zhang; Battsetseg Tuvdendorj; Shanshan Yang; Sonam Rinzin; Foyez Prodhan; Til Sharma. 2021. "Assessment of Drought Impact on Net Primary Productivity in the Terrestrial Ecosystems of Mongolia from 2003 to 2018." Remote Sensing 13, no. 13: 2522.
Drought, a climate-related disaster impacting a variety of sectors, poses challenges for millions of people in South Asia. Accurate and complete drought information with a proper monitoring system is very important in revealing the complex nature of drought and its associated factors. In this regard, deep learning is a very promising approach for delineating the non-linear characteristics of drought factors. Therefore, this study aims to monitor drought by employing a deep learning approach with remote sensing data over South Asia from 2001–2016. We considered the precipitation, vegetation, and soil factors for the deep forwarded neural network (DFNN) as model input parameters. The study evaluated agricultural drought using the soil moisture deficit index (SMDI) as a response variable during three crop phenology stages. For a better comparison of deep learning model performance, we adopted two machine learning models, distributed random forest (DRF) and gradient boosting machine (GBM). Results show that the DFNN model outperformed the other two models for SMDI prediction. Furthermore, the results indicated that DFNN captured the drought pattern with high spatial variability across three penology stages. Additionally, the DFNN model showed good stability with its cross-validated data in the training phase, and the estimated SMDI had high correlation coefficient R2 ranges from 0.57~0.90, 0.52~0.94, and 0.49~0.82 during the start of the season (SOS), length of the season (LOS), and end of the season (EOS) respectively. The comparison between inter-annual variability of estimated SMDI and in-situ SPEI (standardized precipitation evapotranspiration index) showed that the estimated SMDI was almost similar to in-situ SPEI. The DFNN model provides comprehensive drought information by producing a consistent spatial distribution of SMDI which establishes the applicability of the DFNN model for drought monitoring.
Foyez Prodhan; Jiahua Zhang; Fengmei Yao; Lamei Shi; Til Pangali Sharma; Da Zhang; Dan Cao; Minxuan Zheng; Naveed Ahmed; Hasiba Mohana. Deep Learning for Monitoring Agricultural Drought in South Asia Using Remote Sensing Data. Remote Sensing 2021, 13, 1715 .
AMA StyleFoyez Prodhan, Jiahua Zhang, Fengmei Yao, Lamei Shi, Til Pangali Sharma, Da Zhang, Dan Cao, Minxuan Zheng, Naveed Ahmed, Hasiba Mohana. Deep Learning for Monitoring Agricultural Drought in South Asia Using Remote Sensing Data. Remote Sensing. 2021; 13 (9):1715.
Chicago/Turabian StyleFoyez Prodhan; Jiahua Zhang; Fengmei Yao; Lamei Shi; Til Pangali Sharma; Da Zhang; Dan Cao; Minxuan Zheng; Naveed Ahmed; Hasiba Mohana. 2021. "Deep Learning for Monitoring Agricultural Drought in South Asia Using Remote Sensing Data." Remote Sensing 13, no. 9: 1715.
Basin geomorphology is a complete system of landforms and topographic features that play a crucial role in the basin-scale flood risk evaluation. Nepal is a country characterized by several rivers and under the influence of frequent floods. Therefore, identifying flood risk areas is of paramount importance. The East Rapti River, a tributary of the Ganga River, is one of the flood-affected basins, where two major cities are located, making it crucial to assess and mitigate flood risk in this river basin. A morphometric calculation was made based on the Shuttle Radar Topographic Mission (SRTM) 30-m Digital Elevation Model (DEM) in the Geographic Information System (GIS) environment. The watershed, covering 3037.29 km2 of the area has 14 sub-basins (named as basin A up to N), where twenty morphometric parameters were used to identify flash flood potential sub-basins. The resulting flash flood potential maps were categorized into five classes ranging from very low to very high-risk. The result shows that the drainage density, topographic relief, and rainfall intensity have mainly contributed to flash floods in the study area. Hence, flood risk was analyzed pixel-wise based on slope, drainage density, and precipitation. Existing landcover types extracted from the potential risk area indicated that flash flood is more frequent along the major Tribhuvan Rajpath highway. The landcover data shows that human activities are highly concentrated along the west (Eastern part of Bharatpur) and the east (Hetauda) sections. The study concludes that the high human concentrated sub-basin “B” has been categorized as a high flood risk sub-basin; hence, a flood-resilient city planning should be prioritized in the basin.
Til Pangali Sharma; Jiahua Zhang; Narendra Khanal; Foyez Prodhan; Lkhagvadorj Nanzad; Da Zhang; Pashupati Nepal. A Geomorphic Approach for Identifying Flash Flood Potential Areas in the East Rapti River Basin of Nepal. ISPRS International Journal of Geo-Information 2021, 10, 247 .
AMA StyleTil Pangali Sharma, Jiahua Zhang, Narendra Khanal, Foyez Prodhan, Lkhagvadorj Nanzad, Da Zhang, Pashupati Nepal. A Geomorphic Approach for Identifying Flash Flood Potential Areas in the East Rapti River Basin of Nepal. ISPRS International Journal of Geo-Information. 2021; 10 (4):247.
Chicago/Turabian StyleTil Pangali Sharma; Jiahua Zhang; Narendra Khanal; Foyez Prodhan; Lkhagvadorj Nanzad; Da Zhang; Pashupati Nepal. 2021. "A Geomorphic Approach for Identifying Flash Flood Potential Areas in the East Rapti River Basin of Nepal." ISPRS International Journal of Geo-Information 10, no. 4: 247.
Heat-health risk is a growing concern in many regions of China due to the more frequent occurrence of extremely hot weather. Spatial indexes based on various heat assessment frameworks can be used for the assessment of heat risks. In this study, we adopted two approaches—Crichton’s risk triangle and heat vulnerability index (HVI) to identify heat-health risks in the Northern Jiangxi Province of China, by using remote sensing and socio-economic data. The Geographical Information System (GIS) overlay and principal component analysis (PCA) were separately used in two frameworks to integrate parameters. The results show that the most densely populated community in the suburbs, instead of city centers, are exposed to the highest heat risk. A comparison of two heat assessment mapping indicates that the distribution of HVI highlights the vulnerability differences between census tracts. In contrast, the heat risk index of Crichton’s risk triangle has a prominent representation for regions with high risks. The stepwise multiple linear regression zero-order correlation coefficient between HVI and outdoor workers is 0.715, highlighting the vulnerability of this particular group. Spearman’s rho nonparametric correlation and the mean test reveals that heat risk index is strongly correlated with HVI in most of the main urban regions in the study area, with a significantly lower value than the latter. The analysis of variance shows that the distribution of HVI exhibits greater variety across urban regions than that of heat risk index. Our research provides new insight into heat risk assessment for further study of heat health risk in developing countries.
Minxuan Zheng; Jiahua Zhang; Lamei Shi; Da Zhang; Til Pangali Sharma; Foyez Prodhan. Mapping Heat-Related Risks in Northern Jiangxi Province of China Based on Two Spatial Assessment Frameworks Approaches. International Journal of Environmental Research and Public Health 2020, 17, 6584 .
AMA StyleMinxuan Zheng, Jiahua Zhang, Lamei Shi, Da Zhang, Til Pangali Sharma, Foyez Prodhan. Mapping Heat-Related Risks in Northern Jiangxi Province of China Based on Two Spatial Assessment Frameworks Approaches. International Journal of Environmental Research and Public Health. 2020; 17 (18):6584.
Chicago/Turabian StyleMinxuan Zheng; Jiahua Zhang; Lamei Shi; Da Zhang; Til Pangali Sharma; Foyez Prodhan. 2020. "Mapping Heat-Related Risks in Northern Jiangxi Province of China Based on Two Spatial Assessment Frameworks Approaches." International Journal of Environmental Research and Public Health 17, no. 18: 6584.
The Himalayan region, a major source of fresh water, is recognized as a water tower of the world. Many perennial rivers originate from Nepal Himalaya, located in the central part of the Himalayan region. Snowmelt water is essential freshwater for living, whereas it poses flood disaster potential, which is a major challenge for sustainable development. Climate change also largely affects snowmelt hydrology. Therefore, river discharge measurement requires crucial attention in the face of climate change, particularly in the Himalayan region. The snowmelt runoff model (SRM) is a frequently used method to measure river discharge in snow-fed mountain river basins. This study attempts to investigate snowmelt contribution in the overall discharge of the Budhi Gandaki River Basin (BGRB) using satellite remote sensing data products through the application of the SRM model. The model outputs were validated based on station measured river discharge data. The results show that SRM performed well in the study basin with a coefficient of determination (R2) >0.880. Moreover, this study found that the moderate resolution imaging spectroradiometer (MODIS) snow cover data and European Centre for Medium-Range Weather Forecasts (ECMWF) meteorological datasets are highly applicable to the SRM in the Himalayan region. The study also shows that snow days have slightly decreased in the last three years, hence snowmelt contribution in overall discharge has decreased slightly in the study area. Finally, this study concludes that MOD10A2 and ECMWF precipitation and two-meter temperature products are highly applicable to measure snowmelt and associated discharge through SRM in the BGRB. Moreover, it also helps with proper freshwater planning, efficient use of winter water flow, and mitigating and preventive measures for the flood disaster.
Til Prasad Pangali Sharma; Jiahua Zhang; Narendra Raj Khanal; Foyez Ahmed Prodhan; Basanta Paudel; Lamei Shi; Nirdesh Nepal. Assimilation of Snowmelt Runoff Model (SRM) Using Satellite Remote Sensing Data in Budhi Gandaki River Basin, Nepal. Remote Sensing 2020, 12, 1951 .
AMA StyleTil Prasad Pangali Sharma, Jiahua Zhang, Narendra Raj Khanal, Foyez Ahmed Prodhan, Basanta Paudel, Lamei Shi, Nirdesh Nepal. Assimilation of Snowmelt Runoff Model (SRM) Using Satellite Remote Sensing Data in Budhi Gandaki River Basin, Nepal. Remote Sensing. 2020; 12 (12):1951.
Chicago/Turabian StyleTil Prasad Pangali Sharma; Jiahua Zhang; Narendra Raj Khanal; Foyez Ahmed Prodhan; Basanta Paudel; Lamei Shi; Nirdesh Nepal. 2020. "Assimilation of Snowmelt Runoff Model (SRM) Using Satellite Remote Sensing Data in Budhi Gandaki River Basin, Nepal." Remote Sensing 12, no. 12: 1951.
Drought is a very complex natural hazard and has a negative impact on the global ecosystem as a whole. Recently Bangladesh has been experiencing by different degree of dryness as a consequence of high climate variability, affecting the crop production to a great extent in the last couple of decades. In this context, the present study was made an effort to assess and analyse drought characteristics based on two drought indices, i.e., Standardized Precipitation Index (SPI) and Vegetation Condition Index (VCI), and model agricultural drought risk with Fast-and-frugal decision tree (FFT) model in Bangladesh from 2001 to 2016. We identified drought occurrence and its dynamics with three-time scale, i.e., SPI3J (November-January), SPI3A (February-April) and SPI6A (November-April), and three rice-growing seasons, i.e., Aus (March-July), Aman (June-November), and Boro (November-May) from TRMM (Tropical Rainfall Measuring Mission) and MODIS (Moderate Resolution Imaging Spectroradiometer) data. The results demonstrate that TRMM had good consistency with rain gauge measurement compared to CHIRPS (Climate Hazards Group InfraRed Precipitation with Station data) and PERSIANN-CDR (Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks-Climate Data Record) data to derive SPI3J, SPI3A and SPI6A. Overall results confirmed that more drought frequency observed in SPI6A than SPI3J and SPI3A time scale, representing moderate to severe drought throughout the country. Regarding agricultural drought resulting from VCI demonstrated Boro rice-growing season as more vulnerable crop growing season affected by severe to extreme drought event. Validation results of VCI exhibited a high correlation with rice yield data than in-situ soil moisture data. Results of the FFT model show that out of ten predictor variables SPI3J and SPI6A caused agricultural drought with SPI value less than -1.08 and -1.21 respectively. Additionally, the model characterized SPI3J and SPI6A as the most critical driving factors with the highest balanced accuracy triggering agricultural drought risk in Bangladesh.
Foyez Ahmed Prodhan; Jiahua Zhang; Yun Bai; Til Prasad Pangali Sharma; Upama Ashish Koju. Monitoring of Drought Condition and Risk in Bangladesh Combined Data From Satellite and Ground Meteorological Observations. IEEE Access 2020, 8, 93264 -93282.
AMA StyleFoyez Ahmed Prodhan, Jiahua Zhang, Yun Bai, Til Prasad Pangali Sharma, Upama Ashish Koju. Monitoring of Drought Condition and Risk in Bangladesh Combined Data From Satellite and Ground Meteorological Observations. IEEE Access. 2020; 8 (99):93264-93282.
Chicago/Turabian StyleFoyez Ahmed Prodhan; Jiahua Zhang; Yun Bai; Til Prasad Pangali Sharma; Upama Ashish Koju. 2020. "Monitoring of Drought Condition and Risk in Bangladesh Combined Data From Satellite and Ground Meteorological Observations." IEEE Access 8, no. 99: 93264-93282.
The primary concentration of this study was to assess the marketing risks faced by hybrid rice growers and explore the trajectories. With this notion, data were collected from randomly selected 300 hybrid rice growers in purposively chosen areas with the application of a structured interview schedule and conducting five focus group discussions with the farmers. The study identified seven key risks responsible for the poor marketing of hybrid rice in Bangladesh. Perceived marketing risks were assessed by farmer's opinion on likelihood and severity of each risk source through using a fuzzy-Likert scale. According to the finding 'high fluctuation of hybrid rice price' was the most serious risk in hybrid rice marketing in Bangladesh. The regression result found several socio-demographic factors of the farmers are significantly related with perceived risk. This study, therefore, suggests government taking propolicies for hybrid rice growers organized around farmers' those socio-demographic characteristics for minimizing marketing risk. defuzzification value; food security; fuzzy-Likert scale; hybridization; middleman
A K M Kanak Pervez; Ektear Uddin; Ashfaq Ahmad Shah; Foyez Ahmed Prodhan; Mohhiuddin Sheikh. Fuzzy-Likert scale based assessment of marketing risk faced by the hybrid rice growers of Bangladesh. Ekonomika poljoprivrede 2019, 66, 9 -22.
AMA StyleA K M Kanak Pervez, Ektear Uddin, Ashfaq Ahmad Shah, Foyez Ahmed Prodhan, Mohhiuddin Sheikh. Fuzzy-Likert scale based assessment of marketing risk faced by the hybrid rice growers of Bangladesh. Ekonomika poljoprivrede. 2019; 66 (1):9-22.
Chicago/Turabian StyleA K M Kanak Pervez; Ektear Uddin; Ashfaq Ahmad Shah; Foyez Ahmed Prodhan; Mohhiuddin Sheikh. 2019. "Fuzzy-Likert scale based assessment of marketing risk faced by the hybrid rice growers of Bangladesh." Ekonomika poljoprivrede 66, no. 1: 9-22.