Using Remote Sensing Data
Remote Sensing data is information about the spectral reflectance or emittance of an object. Not unlike our human visual perception it is recorded by a sensor onboard a satellite or aircraft. The spectral information provided differs depending on the sensor and is characterised by its resolution.
A good interactive tool set which helps you to get into remote sensing can be found at BiodiversityInformatics.
Different types of Resolution
In remote sensing different types of resolution exist, which are relevant for Biodiversity and Conservation application:
spatial resolution (interactive example)
spectral resolution (interactive example)
Moreover all data sets differ in their coverage or extent of area which is covered by one scene (interactive example). Downloadable images of remote sensing data sets are called scenes and split based on different systems (e.g. the path and row system for Landsat WRS2 or the h and v tiles system by MODIS). If you mosaic these scenes you cover a larger area.
via Remote Sensing.