Table 8.

Comparison between push-broom and snapshot approaches, regarding their advantages and limitations. For a given evaluated parameter, + indicates lower/medium performance while +++ indicates high performance.

Sensor Type	Push-Broom	Snapshot
Acquisition design	Scanner	Optical
No. of bands	++	+++ *
Spectral coverage	++	++
Processing time	+++	++
Bands co-registration	+++	+
Processing complexity	+ (multiple swaths) +++ (single swath)	+
Flight planning	+++	++
Limitations	-Spatial distortions -Data alignment with other sensors -Orthorectification in topographically complex areas	-Radiometric calibration -Bands co-registration -GCPs dependent -Complex field operation
Advantages	Bands co-registration	Simple individual bands processing (compared to RGB)

* The image can be formed from up to 1000 freely selectable spectral bands with 0.1 nm precision, however, handling complexity and processing time increase in proportion to the number of bands used. In this study, only 50 bands were used.