<Li> Infrared: 3.9--7.3 μm (water vapor), 8.7--13.4 μm (thermal imaging) </Li> <P> Visible - light images from weather satellites during local daylight hours are easy to interpret even by the average person; clouds, cloud systems such as fronts and tropical storms, lakes, forests, mountains, snow ice, fires, and pollution such as smoke, smog, dust and haze are readily apparent . Even wind can be determined by cloud patterns, alignments and movement from successive photos . </P> <P> The thermal or infrared images recorded by sensors called scanning radiometers enable a trained analyst to determine cloud heights and types, to calculate land and surface water temperatures, and to locate ocean surface features . Infrared satellite imagery can be used effectively for tropical cyclones with a visible eye pattern, using the Dvorak technique, where the difference between the temperature of the warm eye and the surrounding cold cloud tops can be used to determine its intensity (colder cloud tops generally indicate a more intense storm). Infrared pictures depict ocean eddies or vortices and map currents such as the Gulf Stream which are valuable to the shipping industry . Fishermen and farmers are interested in knowing land and water temperatures to protect their crops against frost or increase their catch from the sea . Even El Niño phenomena can be spotted . Using color - digitized techniques, the gray shaded thermal images can be converted to color for easier identification of desired information . </P> <P> Each meteorological satellite is designed to use one of two different classes of orbit: geostationary and polar orbiting . </P>

Which type of satellite image provides information about the height of clouds
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