{"id":5470,"date":"2022-08-10T17:39:00","date_gmt":"2022-08-10T15:39:00","guid":{"rendered":"https:\/\/geopard.tech\/?p=5470"},"modified":"2026-09-29T10:15:44","modified_gmt":"2026-09-29T08:15:44","slug":"kaj-je-ndvi-normaliziran-indeks-razlike-vegetacije","status":"publish","type":"post","link":"https:\/\/geopard.tech\/sl\/blog\/what-is-ndvi-normalized-difference-vegetation-index\/","title":{"rendered":"Normalizirani indeks razlike v vegetaciji (NDVI) olaj\u0161a \u017eivljenje kmetov"},"content":{"rendered":"<p>Normalizirani diferen\u010dni vegetacijski indeks (NDVI) je pogosto uporabljena metrika za koli\u010dinsko opredelitev gostote in zdravja vegetacije. Njegove vrednosti so od -1 do 1, pri \u010demer negativne vrednosti ka\u017eejo na vodo ali gola tla, vrednosti blizu ni\u010dle na redko vegetacijo, vi\u0161je vrednosti pa na gostej\u0161o in bolj zdravo vegetacijo.<\/p>\n<h2>Kaj je normalizirani indeks razlike vegetacije (NDVI)?<\/h2>\n<p>To je metoda, ki izra\u010dunava razlike med koli\u010dino rde\u010de svetlobe, ki jo sprejme vegetacija, in koli\u010dino bli\u017enje infrarde\u010de svetlobe, ki jo vegetacija mo\u010dno odbija.<\/p>\n<p>Cilj te metode je zagotoviti kvantitativno analizo stanja rastlin. Ni situacije, v kateri bi njegova vrednost padla izven spektra od -1 do +1. Vendar pa ni jasne razmejitve med \u0161tevilnimi vrstami pokrovnosti tal, ki jih lahko najdemo.<\/p>\n<p>\u010ce je vsota \u0161tevilk manj\u0161a od ni\u010d, je zelo verjetno, da je zadevna snov voda. \u010ce dobite rezultat NDVI, ki je precej blizu pozitivni enoti, obstaja velika verjetnost, da gre le za kopico tesno zapakiranih zelenih listov. To \u0161e posebej velja, \u010de so listi gosto zlo\u017eeni drug ob drugem.<\/p>\n<p>Zeleni listi imajo ve\u010djo vrednost kot rde\u010di, zato je tako. Za trenutek si predstavljajte, da je zelo blizu vrednosti 0.<\/p>\n<p>V tak\u0161nih razmerah je le malo mo\u017enosti, da bi bilo na tem obmo\u010dju \u0161e kak\u0161no listje, in regija je morda \u017ee celo urbanizirana. Normalizirani indikator razlike vegetacije je indeks, ki ga uporabljajo analitiki na podro\u010dju <a href=\"https:\/\/geopard.tech\/sl\/blog\/vrste-daljinskega-zaznavanja-v-kmetijstvu\/\">daljinsko zaznavanje<\/a> ve\u010dino \u010dasa.<\/p>\n<h2>Zakaj je uporaben normalizirani indeks razlike vegetacije?<\/h2>\n<p>Obstaja veliko razli\u010dnih vegetacijskih indeksov in velika ve\u010dina jih je med seboj primerljivih. Kljub temu se najpogosteje in naj\u0161ir\u0161e uporablja prav ta, ki ima tudi bistveno prednost, to je visoka lo\u010dljivost slik, ki so pridobljene na podlagi <a href=\"https:\/\/help.geopard.tech\/web\/satellitemonitor\/\">satelitski podatki<\/a>.<\/p>\n<p>V tak\u0161nih okoli\u0161\u010dinah se za dolo\u010ditev NDVI lahko uporabijo kanali z lo\u010dljivostjo deset metrov. Ne pozabite, da je en piksel enak desetim krat desetim metrom. Po drugi strani pa je lahko lo\u010dljivost indeksa, ki uporablja dodatne svetlobne kanale, in sicer rde\u010do starost, dvajset metrov, pri \u010demer je en piksel enak dvajset krat dvajset metrov.<\/p>\n<h2>Kako se izra\u010duna NDVI?<\/h2>\n<p>Dolo\u010dimo ga lahko z naslednjim enostavnim matemati\u010dnim postopkom, ki surove satelitske podatke pretvori v vegetacijske indekse.<\/p>\n<p><img data-recalc-dims=\"1\" fetchpriority=\"high\" decoding=\"async\" data-attachment-id=\"5475\" data-permalink=\"https:\/\/geopard.tech\/sl\/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-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=\"Formula normirane razlike vegetacijskega indeksa\" 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>Ena\u010dba ustvari eno samo \u0161tevilo, ki je reprezentativno in zdru\u017euje informacije, ki so dostopne v rde\u010dem in bli\u017enjem infrarde\u010dem pasu.<\/p>\n<p>Pri tem vzame odbojnost v rde\u010dem spektralnem pasu in jo od\u0161teje od odbojnosti v pasu NIR. Nato se rezultat deli s skupno odbojnostjo NIR in rde\u010dih valovnih dol\u017ein.<\/p>\n<p>Ocena NDVI ne bo nikoli ve\u010dja od pozitivne in manj\u0161a od negativne. Poleg tega \u0161tevilka med -1 in 0 pomeni odmrlo rastlino in anorganske predmete, kot so kamni, ceste in stavbe.<\/p>\n<p>Hkrati lahko njegove vrednosti za \u017eive rastline variirajo od 0 do 1, pri \u010demer 1 pomeni najbolj zdravo rastlino, 0 pa najbolj nezdravo rastlino. Vsakemu pikslu na sliki je mogo\u010de dodeliti eno samo vrednost, ne glede na to, ali ta piksel predstavlja en sam list ali p\u0161eni\u010dno polje, ki se razteza na 500 hektarjih.<\/p>\n<h2>Kako uporabljamo normalizirani indeks razlike vegetacije?<\/h2>\n<p>Upravi\u010deno se zdaj uporablja na \u0161tevilnih razli\u010dnih raziskovalnih podro\u010djih. Na primer, na podro\u010dju kmetijstva se uporablja za namene natan\u010dnega kmetovanja in ocenjevanja biomase. Prav tako ga uporabljajo gozdarji za ocenjevanje gozdnih virov in indeksa listne povr\u0161ine (LAI).<\/p>\n<p>Poleg tega NASA meni, da je zanesljiv pokazatelj su\u0161e. Sorazmerni NDVI in koncentracija vegetacije sta ni\u017eja na obmo\u010djih, kjer voda ovira rast vegetacije.<\/p>\n<p>Voda namre\u010d prepre\u010duje koreninam rastlin, da bi se poglabljale v tla. To, vklju\u010dno z drugimi vrstami <a href=\"https:\/\/geopard.tech\/sl\/blog\/vrste-daljinskega-zaznavanja-v-kmetijstvu\/\">daljinsko zaznavanje<\/a>, je v resnici mogo\u010de uporabiti na veliko razli\u010dnih na\u010dinov.<\/p>\n<h2>Kaj nam lahko NDVI pove o rastlinah?<\/h2>\n<p>Bistveno je, da dobro razumemo, da je normirana razlika <a href=\"https:\/\/geopard.tech\/sl\/blog\/vegetacijski-indeks-kako-se-uporabljajo-v-preciznem-kmetijstvu\/\">Indeks vegetacije<\/a> je le pokazatelj zdravja rastline in ne daje informacij o vzrokih za dolo\u010deno stanje.<\/p>\n<p>Vegetacijski indeks je bolj izraz kot neposreden odraz dogajanja na polju. Oglejmo si tri primere uporabe indeksa NDVI za analizo na terenu:<\/p>\n<p><strong>Ko se za\u010dne nova sezona<\/strong><\/p>\n<p>To je koristno za razumevanje zimske odpornosti rastline in kako ji je uspelo pre\u017eiveti.<\/p>\n<ul>\n<li>\u010ce je njegova vrednost manj\u0161a od 0,15, je precej verjetno, da so vse rastline v tem delu polja propadle. Obi\u010dajno se te \u0161tevilke nana\u0161ajo na obdelana tla brez rastlin.<\/li>\n<li>Drug primer nizkega \u0161tevila je 0,15-0,2. To bi lahko pomenilo, da so se rastline za\u010dele pripravljati na zimo v zgodnjem fenolo\u0161kem obdobju, pred fazo obdelave tal.<\/li>\n<li>Rezultat v razponu od 0,2 do 0,3 je zadovoljiv. Rastline so najverjetneje napredovale do faze obdelave tal in ponovno vzpostavile vegetativno stanje.0,3-<\/li>\n<li>0,5 je spodobna vrednost. Vendar je treba upo\u0161tevati, da vi\u0161je vrednosti NDVI ka\u017eejo, da so rastline prezimovale v poznej\u0161i fenolo\u0161ki fazi. Predpostavimo, da je bila satelitska slika posneta, preden se je vegetacija vrnila v normalno stanje. V tem primeru je pomembna analiza obmo\u010dja po tem, ko je vegetacija nadaljevala svojo normalno obliko.<\/li>\n<li>\u0160tevilo, ve\u010dje od 0,5, pomeni anomalijo v fazi po prezimovanju. Priporo\u010dljivo je, da preverite to obmo\u010dje polja.<\/li>\n<\/ul>\n<p>\u010ce ugotovite, da se dobljene vrednosti bistveno razlikujejo od norme, morate opraviti pregled ustreznega dela polja. Da se vrednosti na dolo\u010denem obmo\u010dju uvrstijo med nenormalne, je potreben velik odmik od norme.<\/p>\n<p><strong>Ko je sezona na sredini<\/strong><\/p>\n<p>Uporaba indeksa je lahko v pomo\u010d pri bolj\u0161em razumevanju razvoja rastlin. Predstavljajte si, da so od\u010ditki med blagimi in visokimi (0,5-0,85). Zelo verjetno je, da se ta del obmo\u010dja trenutno ne soo\u010da z ve\u010djimi izzivi.<\/p>\n<p>\u010ce indeks ostaja ni\u017eji, kot bi moral biti, se lahko pojavijo te\u017eave, kot je pomanjkanje vode ali hranil v tleh. Vendar morate to podro\u010dje raziskati sami.<\/p>\n<p>Ustvarjamo <a href=\"https:\/\/geopard.tech\/sl\/zemljevidi-obmocij-upravljanja-vra\/\">zemljevidi za uporabo s spremenljivo obrestno mero (VRA)<\/a> du\u0161ika z uporabo normaliziranega indeksa razlike v vegetaciji. Opredelili smo obmo\u010dja z vegetacijskimi indeksi od nizkih do visokih.<\/p>\n<p>Nato mora vsak kmet sam dolo\u010diti koli\u010dino potrebnega gnojila. Naju\u010dinkovitej\u0161a metoda za uporabo du\u0161ika je naslednja:<\/p>\n<ul>\n<li>Predpostavimo, da je indeks vegetacije v regiji visok. V tem primeru je treba priporo\u010deni odmerek gnojila zmanj\u0161ati na 10 in 30 odstotkov obi\u010dajnega odmerka.<\/li>\n<li>\u010ce je indeks vegetacije pribli\u017eno povpre\u010den, je treba priporo\u010deni odmerek gnojila pove\u010dati na 20 do 25 odstotkov obi\u010dajne koli\u010dine.<\/li>\n<li>\u010ce je indeks vegetacije nizek, morate najprej ugotoviti, zakaj je tak\u0161en.<\/li>\n<\/ul>\n<p>\u010ce \u017eelite rekonstruirati polje <a href=\"https:\/\/geopard.tech\/sl\/podatki-o-pridelku\/\">kmetijski pridelek<\/a>, uporabljamo tudi ta indeks. Na podlagi teh podatkov pripravimo zemljevide, ki jih lahko uporabimo za variabilno uporabo kalijevih in fosfatnih gnojil.<\/p>\n<p><strong>Ko se sezona kon\u010da<\/strong><\/p>\n<p>Indeks NDVI je uporabno orodje za ugotavljanje, ali so polja pripravljena za spravilo; ni\u017eji kot je indeks, bolj se del obmo\u010dja pribli\u017euje fazi, ko je pripravljen za spravilo. V tem primeru bi bila idealna vrednost indeksa ni\u017eja od 0,25.<\/p>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"5476\" data-permalink=\"https:\/\/geopard.tech\/sl\/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-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=\"Indeks NDVI je uporabno orodje za ugotavljanje, ali so polja pripravljena za \u017eetev.\" 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>Najprej je to matemati\u010dni izra\u010dun, ki se izvaja piksel za pikslom na sliki z uporabo orodij geografskega informacijskega sistema (GIS). Izra\u010duna se s primerjavo koli\u010dine rde\u010de in skoraj infrarde\u010de svetlobe, ki jo rastlina absorbira in odbije, ter meri splo\u0161no zdravstveno stanje rastline.<\/p>\n<p>Normalizirani diferen\u010dni vegetacijski indeks se lahko uporablja za preu\u010devanje zemlji\u0161\u010d po vsem svetu, zato je idealen za usmerjene terenske \u0161tudije in nacionalno ali globalno spremljanje vegetacije.<\/p>\n<p>Z uporabo indeksa NDVI lahko takoj analiziramo polja, kar omogo\u010da kmetom, da optimizirajo proizvodni potencial obmo\u010dij, omejijo njihov vpliv na okolje in spremenijo postopke natan\u010dnega kmetovanja.<\/p>\n<p>Poleg tega bi s preu\u010devanjem podatkov v povezavi z drugimi podatkovnimi tokovi, kot so podatki o vremenu, lahko dobili dodaten vpogled v ponavljajo\u010de se vzorce su\u0161e, zmrzali ali poplav in njihov vpliv na vegetacijo.<\/p>\n<hr \/>\n<h2>Pogosta vpra\u0161anja<\/h2>\n<hr \/>\n<p><strong>1. Kaj se primarno uporablja za dolo\u010danje NDVI?<\/strong><\/p>\n<p>Uporablja se predvsem za ugotavljanje zdravja in gostote vegetacije na dolo\u010denem obmo\u010dju. Ta indeks se pogosto uporablja v kmetijstvu, gozdarstvu in ekologiji za spremljanje rasti vegetacije, ocenjevanje ravni stresa rastlin, ugotavljanje obmo\u010dij su\u0161e ali bolezni ter pomo\u010d pri odlo\u010ditvah o upravljanju pridelkov.<\/p>\n<p><strong>2. Kako brati posnetke NDVI?<\/strong><\/p>\n<p>Slike NDVI lahko berete tako, da interpretirate barvno lestvico, povezano z vrednostmi indeksa. Obi\u010dajno je zdrava vegetacija videti zelena, manj zdrava ali redka vegetacija pa rumena ali rde\u010da.<\/p>\n<p>Temnej\u0161i odtenki lahko ka\u017eejo na obmo\u010dja z veliko biomase, svetlej\u0161i odtenki pa na manj\u0161o gostoto vegetacije ali prisotnost golih tal.<\/p>\n<p>Razumevanje konteksta analiziranega obmo\u010dja, kot so posebna vrsta pridelka ali okoljski pogoji, lahko dodatno pomaga pri razlagi posnetkov NDVI in sprejemanju informiranih odlo\u010ditev o kmetijskih praksah.<\/p>\n\n\n<div class=\"gp-lead\">\n<section class=\"gpx-aiband\">\n  <style>\n    .gp-lead .gpx-aiband{display:flex;align-items:center;gap:24px;flex-wrap:wrap;background:#f2f7ee;border:1px solid #d6e2c5;border-radius:14px;padding:22px 26px;margin:26px 0}\n    .gp-lead .gpx-aiband-txt{flex:1 1 380px}\n    .gp-lead .gpx-aiband-new{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.05em;color:#ffffff;background:#f76a0c;border-radius:999px;padding:3px 9px;vertical-align:3px;margin-left:10px}\n    .gp-lead .gpx-aiband h2{margin:0;font-size:1.3rem}\n    .gp-lead .gpx-aiband p{margin:8px 0 0;color:#4c6066;font-size:.98rem;line-height:1.55}\n    .gp-lead .gpx-aiband-btn{flex:0 0 auto;display:inline-flex;align-items:center;min-height:46px;background:#15701e;color:#ffffff;font-weight:600;padding:0 22px;border-radius:999px;text-decoration:none}\n    .gp-lead .gpx-aiband-btn:hover{background:#145328;color:#ffffff}\n    @media (max-width:640px){ .gp-lead .gpx-aiband{padding:18px} .gp-lead .gpx-aiband-btn{width:100%;justify-content:center} }\n  <\/style>\n  <div class=\"gpx-aiband-txt\">\n    <h2>Spoznajte GeoPardovega pomo\u010dnika umetne inteligence<span class=\"gpx-aiband-new\">NOVO<\/span><\/h2>\n    <p>Umetna inteligenca za precizno kmetijstvo: postavlja prava agronomska vpra\u0161anja, prikazuje svojo matematiko in iz va\u0161ih podatkov gradi preverjene recepte. Vsak korak odobrite.<\/p>\n  <\/div>\n  <a class=\"gpx-aiband-btn\" href=\"https:\/\/geopard.tech\/sl\/umetna-inteligenca\/\">Oglejte si, kako razmi\u0161lja umetna inteligenca \u2192<\/a>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Normalizirani indeks razlike v vegetaciji (NDVI) je pogosto uporabljena metrika za koli\u010dinsko opredelitev gostote in zdravja vegetacije. Njegove vrednosti se gibljejo od -1 do 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