Bruce Murray Space Image Library
The Viking Merged Color Mosaic
![The Viking Merged Color Mosaic](https://planetary.s3.amazonaws.com/web/assets/pictures/_2400x1200_crop_center-center_82_line/20140211_viking_merged_color_mosaic_8192.jpg 2400w, https://planetary.s3.amazonaws.com/web/assets/pictures/_1200x600_crop_center-center_82_line/20140211_viking_merged_color_mosaic_8192.jpg 1200w, https://planetary.s3.amazonaws.com/web/assets/pictures/_768x384_crop_center-center_60_line/20140211_viking_merged_color_mosaic_8192.jpg 768w, https://planetary.s3.amazonaws.com/web/assets/pictures/_576x288_crop_center-center_60_line/20140211_viking_merged_color_mosaic_8192.jpg 576w)
Here is an absolutely enormous version of the mosaic in PNG format, at a resolution of 64 pixels per degree (23040x11520 pixels).
This and other global data sets are available from the USGS Astrogeology website.
There is a new Viking color global mosaic available as of January 2014.