Detection of Ground Materials Using Normalized Difference Indices with a Threshold: Risk and Ways to Improve

In this short communication, we describe the shortcomings and pitfalls of a commonly used method to detect ground materials that relies on setting thresholds for normalized difference indices. We analyze critically present some experimental results USGS ECOSTRESS spectral libraries real Sentinel-2 Landsat-8 images. demonstrate risk commission errors provide suggestions reduce it.