normaal amsterdams peil nap amsterdam ordnance datum water level depth meter |
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| navigate by keyword : according altitude amsterdam amsterdams country countryside datum deep depth dutch gauge geodetic height high indicator information level measure measurement measuring meter method nap normaal normal numbers ordnance outdoor peil pole reference relative scale sea sealevel side survey vertical water |
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| A water level measuring pole in the dutch country side, measurement method according to the Normal Amsterdam Level, NAP. It shows how high the water level is relative to sea level. |
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