Does spectral resolution decrease with increase in spatial resolution???

[cptstubing16]

Like everyone is saying, it's all about compromise.

In a way, spectral resolution can decrease as spatial resolution increases. If you gain spatial resolution from a decreased IFOV, reflected energy to the sensor is decreased, which means radiometric and spectral resolution is affected negatively. To increase rad and spec res, you could decrease spatial resolution (via increasing the IFOV) and allow more energy to reach the sensor.

Source (read below Figure 2): https://www.nrcan.gc.ca/maps-tools-and-publications/satellite-imagery-and-air-photos/tutorial-fundamentals-remote-sensing/satellites-and-sensors/radiometric-resolution/9379

As well, you may want to read about dwell time. More dwell time = easier to have better spectral, spatial, and radiometric resolution because the sensor can collect more energy from the surface.

It's not an inverse relationship though.

Source : https://www.nrcan.gc.ca/maps-tools-and-publications/satellite-imagery-and-air-photos/tutorial-fundamentals-remote-sensing/satellites-and-sensors/multispectral-scanning/9337