{"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\/da\/satnav_technology_could_save_precious_water\/","title":{"rendered":"Navigationsteknologi kan spare p\u00e5 den dyrebare vandressource"},"content":{"rendered":"
\n

En gruppe landm\u00e6nd i USA st\u00e5r over for et problem: I mange \u00e5r har de brugt store m\u00e6ngder vand til at dyrke afgr\u00f8der p\u00e5 k\u00e6mpe marker, men nu er deres vandforsyning ved at l\u00f8be t\u00f8r. Hj\u00e6lpen kan komme fra en spin-off-teknologi fra ESA, der kan bidrage til at bevare vandforsyningen og samtidig sikre, at afgr\u00f8derne ikke kommer til at mangle vand!<\/p>\n<\/div>\n

Planen stammer fra en tidligere ESA-medarbejder ved navn Javier Marti. Han inds\u00e5, at nogle marker vandes for meget, hvilket er meget spild. Kunne man m\u00e5ske bruge satellitter til at se, hvilke marker der virkelig har brug for vand? Det mener Javier!<\/p>\n

\"Circular
Cirkul\u00e6re marker set fra rummet<\/figcaption><\/figure>\n

Satellitter, der kredser om Jorden og normalt bruges til at hj\u00e6lpe folk med at finde vej via GPS-systemer, er n\u00f8glen. Ved at analysere de reflekterede GPS-signaler opdagede Javier, at det er muligt at m\u00e5le, hvor meget vand der er p\u00e5 jorden nedenunder: i jorden, sneen, v\u00e5domr\u00e5der og endda vandstanden i reservoirer. Disse signaler kan afsl\u00f8re, hvilke marker der har brug for vanding, og hvilke der har det fint, som de er.<\/p>\n

\"Irrigation
Vandingsanl\u00e6g som dette spr\u00f8jter vand ud over markerne<\/figcaption><\/figure>\n

I l\u00f8bet af de kommende m\u00e5neder vil flere landm\u00e6nd bruge disse data til at styre, hvor meget de vander deres marker. Man h\u00e5ber, at denne mere effektive metode vil spare dem for 30% af den vandm\u00e6ngde, de normalt bruger. Som en ekstra bonus vil afgr\u00f8derne m\u00e5ske vokse endnu bedre, fordi de f\u00e5r den helt rigtige m\u00e6ngde vand!<\/p>\n

Hvis Javiers id\u00e9 virker, kunne den bruges over hele verden til at spare p\u00e5 vandet \u2013 alt sammen takket v\u00e6re de satellitter, der allerede kredser om Jorden.<\/p>\n

Sjovt faktum:<\/b> Analyse af reflekterede GPS-signaler er en banebrydende teknologi, og i l\u00f8bet af de kommende \u00e5r vil vi m\u00e5ske se mange flere anvendelsesmuligheder for den!<\/p>","protected":false},"excerpt":{"rendered":"

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 […]<\/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\/da\/wp-json\/wp\/v2\/posts\/447","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=447"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/447\/revisions"}],"predecessor-version":[{"id":4483,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/447\/revisions\/4483"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=447"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=447"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=447"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=447"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=447"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=447"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=447"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=447"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=447"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=447"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}