i wanna identify underground tunnel and historical artifacts buried in the underground by satellite images (Thermal or RADAR images), but i don't know how to used this images and which method(s) could be used for this purpose.
Normally, the satellite remote sensing data are applicable for very near surface investigations (top 5 to 10cm). To be successful at mapping the deeper subsurface for tunnels, you will need to apply geophysical methods that are either airborne (for example electromagnetic induction methods) or ground-based (e.g., DC resistivity, seismic reflection/refraction, ground penetrating radar).
Normally, the satellite remote sensing data are applicable for very near surface investigations (top 5 to 10cm). To be successful at mapping the deeper subsurface for tunnels, you will need to apply geophysical methods that are either airborne (for example electromagnetic induction methods) or ground-based (e.g., DC resistivity, seismic reflection/refraction, ground penetrating radar).
Synthetic Aperture Radar (SAR) data has a tendency (with some limitations) to detect underground facilities such as tunnels etc. However, as mentioned above, some geophysical methods would also be required - such as seismic reflections from tunnel can be combined to form a 3D image (Original Source: Gurbuz et al., 2006). This procedure is described in the following link:
i would add to these responses to say that remote sensing, even quality shallow sub-surface geophysical techniques, will have limited benefits for identifying artifacts outside of a significant concentration. If you are interested in mapping artifacts associated with historic features you will need to know something about the typical layout of the historic feature and will have to physically test hypothesized explanations for anomalies in the geophysical data.
This is an introduction to some of the techniques Dale Rucker mentioned with samples of results.
i wanna identify these features in the sub-surface JUST (only) by satellite images method(s), without using any of ground-based or airborne-based method(s). Is this possible?
we did something in this respect using airborne MIVIS (Multispectral Infrared and Visible Imaging Spectrometer) with 102 spectral bands in Selinunte (Sicily) by looking at the soil humidity pattern. I have a conference paper and a dataset (in Italian) on this research in my contributions. It worked quite well.
Data Applicazione di immagini iperspettrali MIVIS alla ricerca am...
just you can use the surface features to identify or expect a subsurface features as the differences in the top soil or rocks the difference of the wetness of the soil and the subsistence in the surface layers of the soil or the rock. but if you want to be sure you have to use the geophysical methods as GPR