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I am vectorizing a raster layer using ArcScan. I need to calculate the area of the vectorized feature after the vectorization process.

What projection should I use for the vectorized polygon layer to calculate the area of the polygon?

Geographic location for the layer is: Bangladesh (in South Asia)

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You could use "Gulshan 303 / Bangladesh Transverse Mercator" (EPSG:3106) or one between EPSG:32645 and EPSG:32646, respectively "WGS 84 / UTM zone 45N" and "WGS 84 / UTM zone 46N", if the zone of interest falls only into one UTM zone. You can use the same projection code in ESRI.

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