Multiple indices based agricultural drought assessment in the northwestern part of Bangladesh using geospatial techniques

Assessment of remote sensing-based indices for drought monitoring in the north-western region of Bangladesh

“…In this study, Landsat ETM + NDVI data was used for the validation of the results, which can provide an accurate representation of the earth surface. This technique was also used in previous studies in the same region [ 43 , 60 ] and the results were consistent with the present study. The validation of other indices has been confirmed in recent studies (LST [ 61 ], NDWI [ 62 ], NDMI [ 63 ] and SAVI [ 64 ]).…”

“…Another possible mechanism could be caused from lower resistance and resilience of vegetation due to drought memory effects [ [82] , [83] , [84] , [85] ]. Moreover, the changes in LULC in the northern region can also influence the NDVI, which has been reported in previous studies [ 43 , 70 , 71 ]. Increasing land surface temperature highlights that the north-western region of Bangladesh is facing climate-induced disturbances (e.g.…”

“…A recent study in the north-western region of Bangladesh reported an increasing drought impact on the existing water courses (e.g. river and canal) [ 74 ], which further led the lowering of ecosystem functioning [ 43 ]. The higher NDVI values in 2005 compared to 2000 in our study could be resulted from the large scale afforestation in degraded land and participatory forestry initiatives by the government and implementation of some donor-funded afforestation projects (e.g., community forestry project in north-western region of Bangladesh funded by Asian Development Bank [ 75 ].…”

“…The vegetation indices such as NDWI, SAVI, LST, and NDVI can be derived from the reflectance of green vegetation-associated blue, green, near-infrared, and red spectral bands [ 35 ]. Despite the great efforts that have been made in recent years to assess drought occurrence, drought risk reduction, and drought adaptation across many regions (including north-western region) of Bangladesh [ 19 , 33 , 41 , 42 ], the evidence of drought assessment using multiple vegetation indices in the north-western region of Bangladesh is limited [ 43 ]. An advanced understanding of the land use and land cover change (LULC), and vegetation greenness-drought relationship using multiple vegetation indices is required to provide compelling evidence of the occurrence and severity of drought.…”

Bats of Bangladesh—A Systematic Review of the Diversity and Distribution with Recommendations for Future Research

“…The high hills are in the southeast region, whereas the low hills are in the northeast and there are moderate highlands in the country's central, north, and northwest [46]. The original vegetation type of the high and low hilly areas is mixed evergreen forest, the moderate highlands are a combination of grassland, moist deciduous, and mixed evergreen forest [47]. The southwest region is the largest mangrove forest in the world, named the Sundarbans [9].…”