The low resolution images are from SPOT - they were collected between 2005 and 2010 (if you want you can download them from geobase.ca for free). The high resolution ones are from DigitalGlobe with collection dates from 2003-2010 according to a quick search on their site.
Algonquin Backcountry Recreationalists
- Caring for Algonquin's Backcountry - abrweb.ca
My Algonquin Park Map
- Accurate, Detailed, Free - Version 3.0! - Now with 50% of Portages and 75% of Campsites Perfectly Located By GPS