How and from where can I find Lidar data for any location in Bangladesh ?
Then, they serve this data openly to the public. NOAA's Digital Coast web map gives you the ability to know exactly where coastal LiDAR is located in the United States. This makes your search for coastal LiDAR data a no-brainer. Go with NOAA.
I frequently use Google Scholar to determine what surveys have been conducted by what agencies in various parts of the world. Airborne lidar is fairly expensive, so any given region may be a patchwork of various surveys for specific purposes - and most of these might never have been publicly published as open datasets for others to use. Usually researchers will also give a reference of citation where they obtained their data. https://scholar.google.com/scholar?start=10&q=bangladesh+airborne+lidar
Of course, you need to refine your own key words for the search.
If you're interested in a digital elevation model. ALOS PALSAR (cell size 12,5m) is freely available and quite accurate.
Data download link: https://search.asf.alaska.edu/#/?dataset=ALOS
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