We define medium resolution imagery to have 1.5-meter (m) to 30-m resolution. Many medium resolution satellites however feature a wide variety of spectral bands with varying resolutions that may or may not meet this threshold
1.5-meter SPOT 6 and 7 products are quite detailed with a lower cost per sq km than high-resolution data sources. In SPOT 6 and 7 imagery, you can see individual houses and even cars/trucks.
When to use medium resolution imagery
The uses of medium resolution imagery are as vast as the human imagination. Here is a list of several situations when it makes the most sense to use medium resolution imagery:
A cost effective means to obtain base layer imagery for large areas
In regions with historically high cloud cover and thus lack of coverage with high resolution imagery
To monitor remote sites and detect large landscape changes
For projects requiring the most up-to-date imagery over large areas
When completing spectral analysis at regional scales
For marco-scale spectral analysis that requires multiple temporal datasets
Replacing Landsat 7 imagery that has missing scan lines
To supplement free lower-resolution satellite imagery such as ASTER and MODIS
ER Solutions offers professional and independent advice on the supply and application of commercially available satellite imagery and spatial datasets for a wide range of applications.