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Height Above Mean Sea Level Height above mean sea level is the measurement of a location's vertical distance—often referred to as height, elevation, or altitude—relative to a vertical dat...
Read Height Above Mean Sea Level: Measurement, Methods, and ApplicationsGeospatial Information Authority of Japan The Geospatial Information Authority of Japan (GSI), known in Japanese as Kokudo Chiri-in, is the primary national institution tasked with the su...
Read Geospatial Information Authority of Japan: Mapping the NationSea level: The Science of Earth's Vertical Datum When we talk about the height of a mountain or the depth of a valley, we almost always reference "sea level." But what exactly is sea leve...
Read Sea level: The Science of Earth's Vertical Datum