{"id":5470,"date":"2022-08-10T17:39:00","date_gmt":"2022-08-10T15:39:00","guid":{"rendered":"https:\/\/geopard.tech\/?p=5470"},"modified":"2023-05-27T20:18:57","modified_gmt":"2023-05-27T18:18:57","slug":"co-je-ndvi-normalizovany-rozdielovy-vegetacny-index","status":"publish","type":"post","link":"https:\/\/geopard.tech\/sk\/blog\/what-is-ndvi-normalized-difference-vegetation-index\/","title":{"rendered":"Normalizovan\u00fd diferen\u010dn\u00fd vegeta\u010dn\u00fd index (NDVI) u\u013eah\u010duje \u017eivot farm\u00e1rom"},"content":{"rendered":"<p>Normalizovan\u00fd rozdielov\u00fd vegeta\u010dn\u00fd index (NDVI) je be\u017ene pou\u017e\u00edvan\u00e1 metrika na kvantifik\u00e1ciu hustoty a zdravia veget\u00e1cie. Jeho hodnoty sa pohybuj\u00fa od -1 do 1, pri\u010dom z\u00e1porn\u00e9 hodnoty znamenaj\u00fa vodu alebo hol\u00fa p\u00f4du, hodnoty bl\u00edzke nule znamenaj\u00fa riedku veget\u00e1ciu a vy\u0161\u0161ie hodnoty znamenaj\u00fa hustej\u0161iu a zdrav\u0161iu veget\u00e1ciu.<\/p>\n<h2>\u010co je normalizovan\u00fd rozdielov\u00fd vegeta\u010dn\u00fd index (NDVI)?<\/h2>\n<p>Ide o met\u00f3du, ktor\u00e1 vypo\u010d\u00edtava rozdiely medzi mno\u017estvom \u010derven\u00e9ho svetla prijat\u00e9ho veget\u00e1ciou a mno\u017estvom bl\u00edzkeho infra\u010derven\u00e9ho svetla, ktor\u00e9 je intenz\u00edvne odr\u00e1\u017ean\u00e9 veget\u00e1ciou.<\/p>\n<p>Cie\u013eom tejto met\u00f3dy je poskytn\u00fa\u0165 kvantitat\u00edvnu anal\u00fdzu stavu rastl\u00edn. Neexistuje \u017eiadna situ\u00e1cia, v ktorej by jej hodnota nespadala do spektra od -1 do +1. Neexistuje v\u0161ak jasn\u00e9 vymedzenie medzi mnoh\u00fdmi typmi p\u00f4dneho krytu, ktor\u00e9 sa m\u00f4\u017eu vyskytova\u0165.<\/p>\n<p>Ak s\u00fa\u010det \u010d\u00edsel vyjde men\u0161\u00ed ako nula, je dos\u0165 pravdepodobn\u00e9, \u017ee dan\u00e1 l\u00e1tka je voda. Ak z\u00edskate v\u00fdsledok NDVI, ktor\u00fd je pomerne bl\u00edzko kladnej hodnote, je ve\u013ek\u00e1 pravdepodobnos\u0165, \u017ee ide len o zhluk pevne zabalen\u00fdch zelen\u00fdch listov. Plat\u00ed to najm\u00e4 vtedy, ak s\u00fa listy husto nabalen\u00e9 na seba.<\/p>\n<p>Zelen\u00e9 listy maj\u00fa v\u00e4\u010d\u0161iu hodnotu ako \u010derven\u00e9, preto je to tak. Na chv\u00ed\u013eu si predstavte, \u017ee je ve\u013emi bl\u00edzko k hodnote 0.<\/p>\n<p>V takejto situ\u00e1cii je sotva pravdepodobn\u00e9, \u017ee tam e\u0161te nejak\u00e9 l\u00edstie zostane, a regi\u00f3n u\u017e m\u00f4\u017ee by\u0165 dokonca urbanizovan\u00fd. Normalizovan\u00fd rozdielov\u00fd indik\u00e1tor veget\u00e1cie je index, ktor\u00fd pou\u017e\u00edvaj\u00fa analytici v oblasti <a href=\"https:\/\/geopard.tech\/sk\/blog\/typy-dialkoveho-prieskumu-zeme-v-polnohospodarstve\/\">dia\u013ekov\u00e9 prieskumy<\/a> v\u00e4\u010d\u0161inu \u010dasu.<\/p>\n<h2>Pre\u010do je normovan\u00fd rozdielov\u00fd vegeta\u010dn\u00fd index u\u017eito\u010dn\u00fd?<\/h2>\n<p>Existuje ve\u013ea r\u00f4znych vegeta\u010dn\u00fdch indexov a ve\u013ek\u00e1 v\u00e4\u010d\u0161ina z nich je navz\u00e1jom porovnate\u013en\u00e1. Je to v\u0161ak ten, ktor\u00fd sa pou\u017e\u00edva naj\u010dastej\u0161ie a najroz\u0161\u00edrenej\u0161ie, a m\u00e1 aj z\u00e1sadn\u00fa v\u00fdhodu, ktorou je vysok\u00e9 rozl\u00ed\u0161enie sn\u00edmok, ktor\u00e9 s\u00fa odvoden\u00e9 od <a href=\"https:\/\/help.geopard.tech\/web\/satellitemonitor\/\">satelitn\u00e9 \u00fadaje<\/a>.<\/p>\n<p>Za tak\u00fdchto okolnost\u00ed sa na ur\u010denie NDVI m\u00f4\u017eu pou\u017ei\u0165 kan\u00e1ly s rozl\u00ed\u0161en\u00edm desa\u0165 metrov. Nezabudnite, \u017ee jeden pixel sa rovn\u00e1 desiatim kr\u00e1t desiatim metrom. Na druhej strane rozl\u00ed\u0161enie indexu, ktor\u00fd vyu\u017e\u00edva \u010fal\u0161ie sveteln\u00e9 kan\u00e1ly, konkr\u00e9tne \u010derven\u00fd vek, m\u00f4\u017ee by\u0165 dvadsa\u0165 metrov, pri\u010dom jeden pixel sa rovn\u00e1 dvadsa\u0165 kr\u00e1t dvadsa\u0165 metrov.<\/p>\n<h2>Ako sa vypo\u010d\u00edta NDVI?<\/h2>\n<p>Mo\u017eno ho ur\u010di\u0165 pomocou nasleduj\u00faceho jednoduch\u00e9ho matematick\u00e9ho postupu, ktor\u00fd prev\u00e1dza nespracovan\u00e9 satelitn\u00e9 inform\u00e1cie na vegeta\u010dn\u00e9 indexy.<\/p>\n<p><img data-recalc-dims=\"1\" fetchpriority=\"high\" decoding=\"async\" data-attachment-id=\"5475\" data-permalink=\"https:\/\/geopard.tech\/sk\/blog\/what-is-ndvi-normalized-difference-vegetation-index\/74-2-min\/\" data-orig-file=\"https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.2-min.jpg?fit=2400%2C1300&amp;ssl=1\" data-orig-size=\"2400,1300\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Normalized Difference Vegetation Index formula\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.2-min.jpg?fit=1024%2C555&amp;ssl=1\" class=\"wp-image-5475 aligncenter\" src=\"https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.2-min.jpg?resize=810%2C439&#038;ssl=1\" alt=\"Vzorec pre normalizovan\u00fd rozdielov\u00fd vegeta\u010dn\u00fd index\" width=\"810\" height=\"439\" srcset=\"https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.2-min.jpg?resize=1024%2C555&amp;ssl=1 1024w, https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.2-min.jpg?resize=300%2C163&amp;ssl=1 300w, https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.2-min.jpg?resize=768%2C416&amp;ssl=1 768w, https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.2-min.jpg?resize=1536%2C832&amp;ssl=1 1536w, https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.2-min.jpg?resize=2048%2C1109&amp;ssl=1 2048w, https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.2-min.jpg?resize=1200%2C650&amp;ssl=1 1200w, https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.2-min.jpg?w=1620&amp;ssl=1 1620w\" sizes=\"(max-width: 810px) 100vw, 810px\" \/><\/p>\n<p>Rovnica vytv\u00e1ra jedno reprezentat\u00edvne \u010d\u00edslo, ktor\u00e9 integruje inform\u00e1cie dostupn\u00e9 v \u010dervenom a NIR (bl\u00edzkom infra\u010dervenom) p\u00e1sme.<\/p>\n<p>Na tento \u00fa\u010del sa vezme odrazivos\u0165 v \u010dervenom spektr\u00e1lnom p\u00e1sme a odpo\u010d\u00edta sa od odrazivosti v NIR p\u00e1sme. Potom sa v\u00fdsledok vydel\u00ed celkovou odrazivos\u0165ou v NIR a \u010dervenom p\u00e1sme.<\/p>\n<p>Hodnotenie NDVI nebude nikdy viac ako kladn\u00e9 a menej ako z\u00e1porn\u00e9. Okrem toho \u010d\u00edslo medzi -1 a 0 ozna\u010duje odumret\u00fa rastlinu a anorganick\u00e9 predmety, ako s\u00fa kamene, cesty a budovy.<\/p>\n<p>Z\u00e1rove\u0148 sa jeho hodnoty pre \u017eiv\u00e9 rastliny m\u00f4\u017eu pohybova\u0165 od 0 do 1, pri\u010dom 1 predstavuje najzdrav\u0161iu rastlinu a 0 najnezdrav\u0161iu rastlinu. Ka\u017ed\u00e9mu pixelu na obr\u00e1zku je mo\u017en\u00e9 priradi\u0165 jednu hodnotu, \u010di u\u017e tento pixel predstavuje jeden list alebo p\u0161eni\u010dn\u00e9 pole s rozlohou 500 hekt\u00e1rov.<\/p>\n<h2>Ako pou\u017e\u00edvame normalizovan\u00fd rozdielov\u00fd vegeta\u010dn\u00fd index?<\/h2>\n<p>V s\u00fa\u010dasnosti sa opr\u00e1vnene vyu\u017e\u00edva v mnoh\u00fdch r\u00f4znych oblastiach v\u00fdskumu. Vyu\u017e\u00edva sa napr\u00edklad v oblasti po\u013enohospod\u00e1rstva na \u00fa\u010dely presn\u00e9ho po\u013enohospod\u00e1rstva a hodnotenia biomasy. Vyu\u017e\u00edvaj\u00fa ho aj lesn\u00edci na hodnotenie lesn\u00fdch zdrojov, ako aj indexu listovej plochy (LAI).<\/p>\n<p>NASA ho navy\u0161e pova\u017euje za spo\u013eahliv\u00fd ukazovate\u013e existencie sucha. Pomern\u00e1 hodnota NDVI a koncentr\u00e1cia veget\u00e1cie s\u00fa ni\u017e\u0161ie v oblastiach, kde voda sl\u00fa\u017ei ako prek\u00e1\u017eka pre vznik veget\u00e1cie.<\/p>\n<p>D\u00f4vodom je, \u017ee voda br\u00e1ni kore\u0148om rastl\u00edn r\u00e1s\u0165 hlb\u0161ie do p\u00f4dy. To, vr\u00e1tane in\u00fdch druhov <a href=\"https:\/\/geopard.tech\/sk\/blog\/typy-dialkoveho-prieskumu-zeme-v-polnohospodarstve\/\">dia\u013ekov\u00e9 prieskumy<\/a>, sa d\u00e1 v skuto\u010dnosti vyu\u017ei\u0165 r\u00f4znymi sp\u00f4sobmi.<\/p>\n<h2>\u010co n\u00e1m m\u00f4\u017ee NDVI poveda\u0165 o rastlin\u00e1ch?<\/h2>\n<p>Je d\u00f4le\u017eit\u00e9, aby ste dobre pochopili, \u017ee normalizovan\u00fd rozdiel <a href=\"https:\/\/geopard.tech\/sk\/blog\/vegetacny-index-ako-sa-pouziva-v-presnom-polnohospodarstve\/\">Index veget\u00e1cie<\/a> je len \u00fadajom o zdravotnom stave rastliny a neposkytuje \u017eiadne inform\u00e1cie o pr\u00ed\u010din\u00e1ch ur\u010dit\u00e9ho stavu.<\/p>\n<p>Vegeta\u010dn\u00fd index je sk\u00f4r vyjadren\u00edm ako priamym odrazom toho, \u010do sa deje na poli. Pozrime sa na tri aplik\u00e1cie NDVI na anal\u00fdzu ter\u00e9nu:<\/p>\n<p><strong>Ke\u010f sa za\u010d\u00edna nov\u00e1 sez\u00f3na<\/strong><\/p>\n<p>Je pr\u00ednosom pre pochopenie zimnej odolnosti rastliny a sp\u00f4sobu, ak\u00fdm sa jej podarilo pre\u017ei\u0165.<\/p>\n<ul>\n<li>Ak je jeho hodnota men\u0161ia ako 0,15, je pravdepodobn\u00e9, \u017ee v\u0161etky rastliny v tejto \u010dasti po\u013ea zahynuli. Zvy\u010dajne sa tieto \u010d\u00edsla vz\u0165ahuj\u00fa na obr\u00e1ban\u00fa p\u00f4du bez ak\u00fdchko\u013evek rastl\u00edn.<\/li>\n<li>\u010eal\u0161\u00edm pr\u00edkladom n\u00edzkeho \u010d\u00edsla je 0,15-0,2. M\u00f4\u017ee to nazna\u010dova\u0165, \u017ee rastliny sa za\u010dali pripravova\u0165 na zimu po\u010das skor\u00e9ho fenologick\u00e9ho obdobia, pred f\u00e1zou kyprenia.<\/li>\n<li>V\u00fdsledok v rozsahu 0,2 a\u017e 0,3 je uspokojiv\u00fd. Rastliny s najv\u00e4\u010d\u0161ou pravdepodobnos\u0165ou pokro\u010dili do f\u00e1zy kyprenia a obnovili svoj vegetat\u00edvny stav.0,3-<\/li>\n<li>0,5 je slu\u0161n\u00e1 hodnota. Je v\u0161ak d\u00f4le\u017eit\u00e9 si uvedomi\u0165, \u017ee vy\u0161\u0161ie hodnoty NDVI nazna\u010duj\u00fa, \u017ee rastliny prezimovali v neskor\u0161om fenologickom \u0161t\u00e1diu. Predpokladajme, \u017ee satelitn\u00e1 sn\u00edmka bola zachyten\u00e1 pred obnoven\u00edm norm\u00e1lneho stavu veget\u00e1cie. V takom pr\u00edpade je d\u00f4le\u017eit\u00e1 anal\u00fdza plochy po tom, ako veget\u00e1cia pokra\u010dovala vo svojej norm\u00e1lnej forme.<\/li>\n<li>\u010c\u00edslo v\u00e4\u010d\u0161ie ako 0,5 znamen\u00e1 anom\u00e1liu po\u010das f\u00e1zy po prezimovan\u00ed. Odpor\u00fa\u010da sa skontrolova\u0165 t\u00fato po\u013en\u00fa z\u00f3nu.<\/li>\n<\/ul>\n<p>Ak si v\u0161imnete, \u017ee z\u00edskan\u00e9 hodnoty sa v\u00fdrazne l\u00ed\u0161ia od normy, mus\u00edte vykona\u0165 kontrolu pr\u00edslu\u0161nej \u010dasti po\u013ea. Ve\u013ek\u00e1 odch\u00fdlka od normy je potrebn\u00e1 na to, aby sa hodnoty v danej oblasti kategorizovali ako abnorm\u00e1lne.<\/p>\n<p><strong>Ke\u010f je sez\u00f3na v polovici<\/strong><\/p>\n<p>Vyu\u017eitie indexu m\u00f4\u017ee by\u0165 u\u017eito\u010dn\u00e9 pri lep\u0161om pochopen\u00ed v\u00fdvoja rastl\u00edn. Predstavte si, \u017ee hodnoty sa pohybuj\u00fa medzi miernymi a vysok\u00fdmi (0,5-0,85). Je ve\u013emi pravdepodobn\u00e9, \u017ee t\u00e1to konkr\u00e9tna \u010das\u0165 oblasti v s\u00fa\u010dasnosti ne\u010del\u00ed \u017eiadnym v\u00e4\u010d\u0161\u00edm probl\u00e9mom.<\/p>\n<p>Ak je index ni\u017e\u0161\u00ed, ako by mal by\u0165, m\u00f4\u017ee \u00eds\u0165 o probl\u00e9my, ako je nedostatok vody v p\u00f4de alebo \u017eiv\u00edn. T\u00fato konkr\u00e9tnu oblas\u0165 v\u0161ak mus\u00edte presk\u00fama\u0165 sami.<\/p>\n<p>Generujeme <a href=\"https:\/\/geopard.tech\/sk\/mapy-zon-riadenia-vra\/\">mapy pre aplik\u00e1ciu s premenlivou sadzbou (VRA)<\/a> dus\u00edka pomocou normalizovan\u00e9ho diferen\u010dn\u00e9ho vegeta\u010dn\u00e9ho indexu. Identifikujeme regi\u00f3ny s vegeta\u010dn\u00fdmi indexmi od n\u00edzkych po vysok\u00e9.<\/p>\n<p>Potom je na ka\u017edom po\u013enohospod\u00e1rovi, aby ur\u010dil mno\u017estvo potrebn\u00e9ho hnojiva. Nasleduj\u00faci postup je naj\u00fa\u010dinnej\u0161\u00ed pri aplik\u00e1cii dus\u00edka:<\/p>\n<ul>\n<li>Predpokladajme, \u017ee vegeta\u010dn\u00fd index pre dan\u00fa oblas\u0165 je vysok\u00fd. V takom pr\u00edpade by sa odpor\u00fa\u010dan\u00e1 d\u00e1vka hnojiva mala zn\u00ed\u017ei\u0165 na 10 a\u0163 30 % typickej d\u00e1vky.<\/li>\n<li>Ak je vegeta\u010dn\u00fd index pribli\u017ene priemern\u00fd, odpor\u00fa\u010dan\u00e1 d\u00e1vka hnojiva by sa mala zv\u00fd\u0161i\u0165 na 20 a\u017e 25 % be\u017en\u00e9ho mno\u017estva.<\/li>\n<li>Ak je index veget\u00e1cie n\u00edzky, mus\u00edte najprv zisti\u0165, pre\u010do je tak\u00fd.<\/li>\n<\/ul>\n<p>Rekon\u0161trukcia po\u013ea <a href=\"https:\/\/geopard.tech\/sk\/udaje-o-vynose\/\">po\u013enohospod\u00e1rsky v\u00fdnos<\/a>, pou\u017e\u00edvame aj tento index. Na z\u00e1klade t\u00fdchto \u00fadajov vytv\u00e1rame mapy, ktor\u00e9 sa m\u00f4\u017eu pou\u017ei\u0165 pri variabilnej d\u00e1vke aplik\u00e1cie draseln\u00fdch a fosfore\u010dn\u00fdch hnoj\u00edv.<\/p>\n<p><strong>Po skon\u010den\u00ed sez\u00f3ny<\/strong><\/p>\n<p>Index NDVI je u\u017eito\u010dn\u00fdm n\u00e1strojom na ur\u010denie, \u010di s\u00fa polia pripraven\u00e9 na zber \u00farody; \u010d\u00edm je index ni\u017e\u0161\u00ed, t\u00fdm viac sa \u010das\u0165 plochy bl\u00ed\u017ei k \u0161t\u00e1diu, ke\u010f je pripraven\u00e1 na zber \u00farody. V tomto pr\u00edpade by bola ide\u00e1lna hodnota indexu ni\u017e\u0161ia ako 0,25.<\/p>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"5476\" data-permalink=\"https:\/\/geopard.tech\/sk\/blog\/what-is-ndvi-normalized-difference-vegetation-index\/74-3-min-1\/\" data-orig-file=\"https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.3-min-1.jpg?fit=2400%2C1300&amp;ssl=1\" data-orig-size=\"2400,1300\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"What can NDVI tell us about plants\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.3-min-1.jpg?fit=1024%2C555&amp;ssl=1\" class=\"wp-image-5476 aligncenter\" src=\"https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.3-min-1.jpg?resize=810%2C439&#038;ssl=1\" alt=\"Index NDVI je u\u017eito\u010dn\u00fd n\u00e1stroj na ur\u010denie, \u010di s\u00fa polia pripraven\u00e9 na zber \u00farody\" width=\"810\" height=\"439\" srcset=\"https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.3-min-1.jpg?resize=1024%2C555&amp;ssl=1 1024w, https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.3-min-1.jpg?resize=300%2C163&amp;ssl=1 300w, https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.3-min-1.jpg?resize=768%2C416&amp;ssl=1 768w, https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.3-min-1.jpg?resize=1536%2C832&amp;ssl=1 1536w, https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.3-min-1.jpg?resize=2048%2C1109&amp;ssl=1 2048w, https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.3-min-1.jpg?resize=1200%2C650&amp;ssl=1 1200w, https:\/\/i0.wp.com\/geopard.tech\/wp-content\/uploads\/2022\/07\/74.3-min-1.jpg?w=1620&amp;ssl=1 1620w\" sizes=\"(max-width: 810px) 100vw, 810px\" \/><\/p>\n<p>Na za\u010diatku ide o matematick\u00fd v\u00fdpo\u010det, ktor\u00fd sa vykon\u00e1va pixel po pixeli na obr\u00e1zku s vyu\u017eit\u00edm n\u00e1strojov GIS (geografick\u00e9ho informa\u010dn\u00e9ho syst\u00e9mu). Vypo\u010d\u00edta sa na z\u00e1klade porovnania mno\u017estva \u010derven\u00e9ho a bl\u00edzkeho infra\u010derven\u00e9ho svetla absorbovan\u00e9ho a odrazen\u00e9ho rastlinou a meria celkov\u00fd zdravotn\u00fd stav rastliny.<\/p>\n<p>Normalizovan\u00fd rozdielov\u00fd vegeta\u010dn\u00fd index mo\u017eno pou\u017ei\u0165 na \u0161t\u00fadium krajiny na celom svete, tak\u017ee je ide\u00e1lny na cielen\u00e9 ter\u00e9nne \u0161t\u00fadie a n\u00e1rodn\u00e9 alebo glob\u00e1lne monitorovanie veget\u00e1cie.<\/p>\n<p>Pomocou NDVI m\u00f4\u017eeme z\u00edska\u0165 okam\u017eit\u00fa anal\u00fdzu pol\u00ed, ktor\u00e1 umo\u017en\u00ed po\u013enohospod\u00e1rom optimalizova\u0165 produk\u010dn\u00fd potenci\u00e1l pl\u00f4ch, obmedzi\u0165 ich vplyv na \u017eivotn\u00e9 prostredie a upravi\u0165 ich presn\u00e9 po\u013enohospod\u00e1rske oper\u00e1cie.<\/p>\n<p>Okrem toho by ich sk\u00famanie v spojen\u00ed s \u010fal\u0161\u00edmi d\u00e1tov\u00fdmi tokmi, ako s\u00fa \u00fadaje o po\u010das\u00ed, mohlo poskytn\u00fa\u0165 \u010fal\u0161ie inform\u00e1cie o opakuj\u00facich sa vzoroch sucha, mrazov alebo povodn\u00ed a o tom, ako ovplyv\u0148uj\u00fa veget\u00e1ciu.<\/p>\n<hr \/>\n<h2>\u010casto kladen\u00e9 ot\u00e1zky<\/h2>\n<hr \/>\n<p><strong>1. \u010co sa prim\u00e1rne pou\u017e\u00edva na ur\u010denie NDVI?<\/strong><\/p>\n<p>Pou\u017e\u00edva sa predov\u0161etk\u00fdm na ur\u010denie zdravotn\u00e9ho stavu a hustoty veget\u00e1cie v danej oblasti. Tento index sa \u0161iroko pou\u017e\u00edva v po\u013enohospod\u00e1rstve, lesn\u00edctve a ekol\u00f3gii na monitorovanie rastu veget\u00e1cie, hodnotenie \u00farovne stresu rastl\u00edn, identifik\u00e1ciu oblast\u00ed sucha alebo chor\u00f4b a na pomoc pri rozhodovan\u00ed o riaden\u00ed plod\u00edn.<\/p>\n<p><strong>2. Ako \u010d\u00edta\u0165 sn\u00edmky NDVI?<\/strong><\/p>\n<p>Ak chcete \u010d\u00edta\u0165 sn\u00edmky NDVI, m\u00f4\u017eete interpretova\u0165 farebn\u00fa \u0161k\u00e1lu spojen\u00fa s hodnotami indexu. Zvy\u010dajne sa zdrav\u00e1 veget\u00e1cia zobrazuje zelenou farbou, zatia\u013e \u010do menej zdrav\u00e1 alebo riedka veget\u00e1cia sa zobrazuje \u017eltou alebo \u010dervenou farbou.<\/p>\n<p>Tmav\u0161ie odtiene m\u00f4\u017eu nazna\u010dova\u0165 oblasti s vysok\u00fdm obsahom biomasy, zatia\u013e \u010do svetlej\u0161ie odtiene m\u00f4\u017eu nazna\u010dova\u0165 ni\u017e\u0161iu hustotu veget\u00e1cie alebo pr\u00edtomnos\u0165 holej p\u00f4dy.<\/p>\n<p>Pri interpret\u00e1cii sn\u00edmok NDVI a prij\u00edman\u00ed informovan\u00fdch rozhodnut\u00ed o po\u013enohospod\u00e1rskych postupoch m\u00f4\u017ee \u010falej pom\u00f4c\u0165 pochopenie kontextu analyzovanej oblasti, napr\u00edklad konkr\u00e9tneho typu plodiny alebo environment\u00e1lnych podmienok.<\/p>","protected":false},"excerpt":{"rendered":"<p>Normalizovan\u00fd index rozdielovej veget\u00e1cie (NDVI) je be\u017ene pou\u017e\u00edvan\u00e1 metrika na kvantifik\u00e1ciu hustoty a zdravia veget\u00e1cie. Jeho hodnoty sa pohybuj\u00fa od -1 do 1,\u2026<\/p>","protected":false},"author":210157960,"featured_media":5474,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_eb_attr":"","content-type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"{title}\n\n{excerpt}\n\n{url}","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[1662,1380,1377],"tags":[1619,1618],"class_list":["post-5470","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ndvi","category-whats","category-crop-monitoring","tag-normalized-difference-vegetation-index","tag-crop-monitoring"],"acf":[],"yoast_head":"<!-- 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