The following communities were updated on the raster topographic basemap:
- Chatham-Kent, ON
- Gatineau, QC
- Guelph, ON
- Huron County, ON
- Orangeville, ON
- Rimouski, QC
Left: Orangeville, ON using only federal and provincial data. Right: Orangeville, ON with municipal data included.
The imagery basemap was also updated with some Canadian content. Strathcona County, AB provided 8 cm imagery from 2017 to replace the existing 10 cm imagery from 2015, and Beaupré, QC supplied 15 cm imagery from 2016 to replace the existing 15 cm imagery from 2012.
Changes in Strathcona County, AB are reflected in these two images. The one on the left was taken in 2015 while the one on the right was taken in 2017.
World Imagery Wayback App
If you’re feeling nostalgic for some older imagery that has since been updated, visit the World Imagery Wayback app online. There, you can view any of the 81 different versions of imagery that has been published on ArcGIS Online going back to early 2014. To narrow what’s available for the area you’re looking at, check the box that says “Only updates with local changes” in the left panel.
This will greatly reduce the number of imagery basemaps versions that appear in the panel. In this area of Brampton, for instance, five different versions appear. Any of these versions can be queried for more information or selected to add to a basemap.
The items then appear in the far, far left ArcGIS Online shopping cart. Once you’ve completed your selection, click on this icon to open up a map on ArcGIS Online containing the selected basemap. versions.
Note that the dates listed in the World Imagery Wayback app are the dates when the imagery was published, not when the imagery was taken.
About the Author
Paul Heersink is a cartographer and Production Manager of Esri Canada’s Community Maps Program: an initiative that is aiming to build a seamless topographic basemap using contributor data. He has over 15 years of cartographic experience, working in both the public and private sectors. Paul has always been interested in mapping and drew his own atlas at the age of 10. He took a detour in his career through the fields of psychology and social work before returning to cartography.More Content by Paul Heersink