Mea­sure wa­ter qual­ity with your phone

Science Illustrated - - NATURE -

TAKE PHO­TOS: The colour of the wa­ter al­lows a very ac­cu­rate im­pres­sion of the wa­ter qual­ity of oceans, lakes, and streams. Bluish wa­ter is typ­i­cally clean, whereas green­ish wa­ter has more al­gae. In or­der to col­lect global wa­ter qual­ity data, Ger­man and Dutch sci­en­tists have de­vel­oped the EyeOnWater app. You only need to take a pic­ture of the wa­ter sur­face, com­pare its colour to a colour scale, and up­load ev­ery­thing to­gether with the GPS co­or­di­nates of your lo­ca­tion.

The wa­ter colour re­veals whether oceans and streams are of low food value or full of al­gae.

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