BATHYMETRY: the measurement of depth of water in oceans, lakes, or rivers; submarine topography, or think upside down topo map.
EULERIAN SPECIFICATION: the fixed-point approach to collecting data. It’s the weather station analogy, but in this case it’s a gauging station and the river flows past it.
GIS: Geographic Information System; a system designed to capture, store, manipulate, analyze, manage, and present spatial or geographical data.
LANGRANGIAN SPECIFICATION: Freshwater Map’s game-changing “go-with-the-flow” method of collecting 3-D river data. It’s the weather balloon analogy, but in this case think river raft.
LIMNOLOGY: the scientific study of the organisms living in and around the phenomena of fresh water, especially lakes and ponds, rivers and streams, springs and wetlands.
THALWEG: a geology term that refers to a line connecting the lowest points of successive cross-sections along the course of a valley or river; for Freshwater Map purposes, it’s the deepest part of the river.
VECTOR: any quantity with both a magnitude and a direction; e.g. velocity is a vector because it describes both how fast something is moving and in what direction.
VELOCITY: the speed of something in a given direction, in this case a river; also known as flow.