Isotachs, similar to isobars, are also lines connecting points of equal properties. However, isotachs connect areas with similar WIND SPEEDS. This map shows the wind speeds in a large portion of the U.S. using isotachs. This map is also planimetric and an isoline map.
http://images.google.com/imgres?imgurl=http://www.crh.noaa.gov/lmk/soo/research/papfigs/11794pap_fig3.gif&imgrefurl=http://www.crh.noaa.gov/lmk/soo/research/paps_11794.php&usg=__D--dJEn5Hcf5q81AkBsPoUI28Tk=&h=264&w=270&sz=25&hl=en&start=7&um=1&itbs=1&tbnid=VWchT_Rj9Id1zM:&tbnh=110&tbnw=113&prev=/images%3Fq%3Disotachs%26um%3D1%26hl%3Den%26sa%3DN%26gbv%3D2%26ndsp%3D21%26tbs%3Disch:1
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