{"id":447,"date":"2017-05-17T10:13:00","date_gmt":"2017-05-17T08:13:00","guid":{"rendered":"https:\/\/kids.esa.int\/satnav_technology_could_save_precious_water\/"},"modified":"2026-10-08T00:28:19","modified_gmt":"2026-10-07T22:28:19","slug":"satnav_technology_could_save_precious_water","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/satnav_technology_could_save_precious_water\/","title":{"rendered":"Navigointij\u00e4rjestelmien tekniikka voisi s\u00e4\u00e4st\u00e4\u00e4 arvokasta vett\u00e4"},"content":{"rendered":"<div class=\"lede\">\n<p>Yhdysvalloissa er\u00e4\u00e4ll\u00e4 viljelij\u00e4ryhm\u00e4ll\u00e4 on ongelma: he ovat jo vuosien ajan k\u00e4ytt\u00e4neet suuria m\u00e4\u00e4ri\u00e4 vett\u00e4 viljelyyn valtavilla pelloilla, mutta nyt heid\u00e4n vesivarantonsa ovat ehtym\u00e4ss\u00e4. Apua saattaa tulla ESA:n spin-off-teknologiasta, jonka avulla voitaisiin s\u00e4\u00e4st\u00e4\u00e4 vesivaroja ja samalla varmistaa, ett\u00e4 viljelykasvit eiv\u00e4t j\u00e4\u00e4 janoisiksi!<\/p>\n<\/div>\n<p>Suunnitelma on entisen ESA:n ty\u00f6ntekij\u00e4n Javier Mart\u00edn k\u00e4sialaa. H\u00e4n huomasi, ett\u00e4 joitakin peltoja kastellaan liikaa, mik\u00e4 on suurta tuhlausta. Voisiko satelliittien avulla selvitt\u00e4\u00e4, mitk\u00e4 pellot todella tarvitsevat vett\u00e4? Javier uskoo niin!<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1180\" data-credit=\"Google Earth\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2017\/05\/Circular_fields_as_seen_from_space\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2017\/05\/circular_fields_as_seen_from_space\/17903122-2-eng-GB\/Circular_fields_as_seen_from_space.jpg\" alt=\"Circular fields as seen from space\"><figcaption>Py\u00f6re\u00e4t pellot avaruudesta n\u00e4htyn\u00e4<\/figcaption><\/figure>\n<p>Avainasemassa ovat Maata kiert\u00e4v\u00e4t satelliitit, joita yleens\u00e4 k\u00e4ytet\u00e4\u00e4n auttamaan ihmisi\u00e4 suunnistamaan satelliittinavigointij\u00e4rjestelmien avulla. Analysoimalla heijastuneita satelliittinavigointisignaaleja Javier havaitsi, ett\u00e4 niiden avulla on mahdollista mitata, kuinka paljon vett\u00e4 maaper\u00e4ss\u00e4 on: maaper\u00e4ss\u00e4, lumessa, kosteikoissa ja jopa tekoaltaiden vesitasoissa. N\u00e4m\u00e4 signaalit voivat paljastaa, mitk\u00e4 pellot tarvitsevat kastelua ja mitk\u00e4 ovat kunnossa sellaisenaan.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1920\" data-credit=\"Divirod\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2017\/05\/Irrigation_systems_like_this_sprinkle_water_over_fields\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2017\/05\/irrigation_systems_like_this_sprinkle_water_over_fields\/18248067-2-eng-GB\/Irrigation_systems_like_this_sprinkle_water_over_fields.jpg\" alt=\"Irrigation systems like this sprinkle water over fields\"><figcaption>T\u00e4llaiset kasteluj\u00e4rjestelm\u00e4t suihkuttavat vett\u00e4 pelloille<\/figcaption><\/figure>\n<p>Seuraavien kuukausien aikana useat viljelij\u00e4t aikovat hy\u00f6dynt\u00e4\u00e4 n\u00e4it\u00e4 tietoja s\u00e4\u00e4t\u00e4\u00e4kseen peltojensa kastelum\u00e4\u00e4ri\u00e4. Toivon mukaan t\u00e4m\u00e4 tehokkaampi menetelm\u00e4 s\u00e4\u00e4st\u00e4\u00e4 heille 30% vett\u00e4 verrattuna tavalliseen kulutukseen. Lis\u00e4etuna on, ett\u00e4 sadot saattavat kasvaa entist\u00e4 paremmin, koska ne saavat juuri oikean m\u00e4\u00e4r\u00e4n vett\u00e4!<\/p>\n<p>Jos Javierin idea toimii, sit\u00e4 voitaisiin hy\u00f6dynt\u00e4\u00e4 ymp\u00e4ri maailmaa veden s\u00e4\u00e4st\u00e4miseksi \u2013 kaikki kiitos satelliittien, jotka ovat jo kiertoradalla Maan ymp\u00e4rill\u00e4.<\/p>\n<p><b>Mielenkiintoinen fakta:<\/b> Heijastuneiden navigaattorisignaalien analysointi on l\u00e4pimurtoteknologia, ja seuraavien vuosien aikana saatamme n\u00e4hd\u00e4 sille viel\u00e4 monia uusia k\u00e4ytt\u00f6kohteita!<\/p>","protected":false},"excerpt":{"rendered":"<p>A group of farmers in the USA have a problem: for many years they have been using large amounts of water to grow crops in huge fields, but now their [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2017\/05\/farmers_need_a_lot_of_water_for_their_crops\/17880698-2-eng-GB\/Farmers_need_a_lot_of_water_for_their_crops.jpg","esa_banner_description":"Farmers need a lot of water for their crops","esa_banner_credit":"Navtronics BVBA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2017\/05\/Farmers_need_a_lot_of_water_for_their_crops","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-447","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/447","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=447"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/447\/revisions"}],"predecessor-version":[{"id":4483,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/447\/revisions\/4483"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=447"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=447"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=447"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=447"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=447"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=447"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=447"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=447"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=447"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=447"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}