Measurement Principles


Read more about the various measurement principles that OTT HydroMet employs.

Hydrology Measurement Principles

Guide to Hydrological Practices - Volume I

Click here to download the WMO Guide

Guide to Hydrological Practices - Volume II
Management of Water Resources and Application of Hydrological Practices

Click here to download the WMO Guide

How Streamflow is Measured – USGS

Stream gaging generally involves 3 steps:

Click here to get to the USGS Streamgaging overview

Meteorology Measurement Principles

Meteorological measurements for weather forecasting and climatology have been carried out on a regular basis for centuries. However, the data acquired can only be evaluated and interpreted after having statistically recorded medium-term and long-term atmospheric conditions.

Nowadays, transport and communications such as ground, air and sea traffic could not be maintained without these data, which are mainly being collected from measurements and observations in the atmosphere close to the ground (the Boundary Layer).

The main meteorological parameters in this field are:

These parameters are also significant for such issues as air pollution, avalanche warning, sun simulation, renewable energy industry, agriculture, forestry, water supply and distribution, town and regional planning.

For example, the evaluation and interpretation of gas emission measurements is only possible in comparison with meteorological data acquired concurrently.

Solar Measurement Principles

Solar Radiation Measurement - WMO

Click here to download the WMO Guide

The Sun’s impact on the Earth

Link to WMO Website

How WMO measures sunlight

WMO has launched a video on the critical role that the WMO World Radiation Center plays in “Measuring sunlight”.

While the Earth’s climate is influenced by many factors – among them greenhouse gases, ocean temperatures and volcanic eruptions – the sun plays a particularly central role.

Scientists therefore rely on solar radiation measurements in order to study climate variability and change and to forecast the weather.

The video was released as WMO hosts high-level meetings on future priorities for weather, climate and environmental science and research.

There is a special focus on translating scientific advances into user-friendly services for society.

Click to view the WMO video


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