hydrographic reconnaissance การใช้

And the most important he listed was hydrographic reconnaissance:
Military combat organizations such as the U . S . Navys SEALs and military engineering units have specialized hydrographic reconnaissance survey capabilities.
By 1887, he was a second lieutenant, and participated in the hydrographic reconnaissance of the north of Chile, specially the areas of Esmeralda, Carrizal Bajo, and Arica.
Aerial photography, submarine periscope photography and hydrographic reconnaissance by recon Marines and Navy UDT teams became part of the array of intelligence assets that were worked into the operation plan for the invasion.
Other federal agencies such as the United States Environmental Protection Agency and the United States Fish and Wildlife Service use these data and, along with SEALs and military engineering units have specialized hydrographic reconnaissance survey capabilities.