A preliminary survey to gain information
especially : an exploratory military survey of enemy territory
“Reconnaissance.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/reconnaissance. Accessed 29 Mar. 2020.
In Bruckner’s reading, it discusses how Evans conducted several more reconnaissance surveys of several states for military purpose when creating his map. (pg. 30).