digital surface model with 5 m post spacing
digital surface model
with 5 m post spacing

What are the at-sensor solar exoatmospheric irradiances of the IRS cameras?

The at-sensor solar exoatmospheric irradiance and Rayleigh optical thickness can be found at the end of the NRSC reports for IRS-1C/1D/P6 and Resourcesat-2.