{"id":7636,"date":"2023-11-08T18:19:07","date_gmt":"2023-11-08T16:19:07","guid":{"rendered":"https:\/\/tethys.farm\/?p=7636"},"modified":"2023-11-09T10:35:23","modified_gmt":"2023-11-09T08:35:23","slug":"ndwi-index-to-safeguard-the-health-of-your-crops-2","status":"publish","type":"post","link":"https:\/\/tethys.farm\/en\/ndwi-index-to-safeguard-the-health-of-your-crops-2\/","title":{"rendered":"Prevent water stress with the NDWI index"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"7636\" class=\"elementor elementor-7636\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7dd5430e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7dd5430e\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3a718e95\" data-id=\"3a718e95\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-353ef5b3 elementor-widget elementor-widget-text-editor\" data-id=\"353ef5b3\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>L&#039;<strong>NDWI<\/strong> (Normalized Difference Water Index) is a <strong>crucial index<\/strong> in precision agriculture since it is capable of <strong>measure the water level<\/strong> contained in crops. This index is therefore essential not only to prevent the onset of <strong>water stress<\/strong>, but also to choose the <strong>best time for harvesting<\/strong>.<\/p><p>The index allows farmers to <strong>to monitor<\/strong> carefully monitor the effects of irrigation on plants and take timely corrective measures to ensure optimal management of water resources and <strong>improve crop yields.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6f1598f0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6f1598f0\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-36c86267\" data-id=\"36c86267\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-743bb397 elementor-widget elementor-widget-image\" data-id=\"743bb397\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"768\" src=\"https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-1-768x768.jpg\" class=\"attachment-medium_large size-medium_large wp-image-7645\" alt=\"\" srcset=\"https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-1-768x768.jpg 768w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-1-300x300.jpg 300w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-1-1024x1024.jpg 1024w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-1-150x150.jpg 150w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-1-1536x1536.jpg 1536w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-1-2048x2048.jpg 2048w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-1-600x600.jpg 600w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-1-100x100.jpg 100w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-1-1x1.jpg 1w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-1-10x10.jpg 10w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-b3d29d9\" data-id=\"b3d29d9\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4d378ea elementor-widget elementor-widget-text-editor\" data-id=\"4d378ea\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The values of the NDWI index vary from -1 to +1, where the former refers to inanimate objects, while the latter represents a crop characterized by a very high water content.<\/p><p>How is this data obtained?<\/p><p>Through i <strong>satellites<\/strong> that orbit above us. In fact, these have <strong>optical sensors<\/strong> able to collect <strong>precious informations<\/strong> on the light that is reflected or absorbed by cultivated fields in the different frequency bands.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-89e5654 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"89e5654\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-7b487bd\" data-id=\"7b487bd\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d2fe017 elementor-widget elementor-widget-text-editor\" data-id=\"d2fe017\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: left;\">To obtain the NDWI index, the bands that correspond to short-wave infrared are used (<strong>SWIR<\/strong>) and near infrared (<strong>NIR<\/strong>), according to the following formula:<\/p><p>(NIR \u2013 SWIR)<br \/>&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<br \/>(NIR + SWIR)<\/p><p>Water absorbs a lot of light in the short-wave infrared, but much less in the near-infrared. Therefore, by comparing the short-wave infrared and near-infrared bands, we calculate a value that indicates <strong>the amount of water<\/strong> contained in the vegetation of a plot of land or a specific portion of it.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-31655b7\" data-id=\"31655b7\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e2c8f77 elementor-widget elementor-widget-image\" data-id=\"e2c8f77\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1707\" src=\"https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-3-scaled.jpg\" class=\"attachment-full size-full wp-image-7647\" alt=\"\" srcset=\"https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-3-scaled.jpg 2560w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-3-300x200.jpg 300w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-3-1024x683.jpg 1024w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-3-768x512.jpg 768w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-3-1536x1024.jpg 1536w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-3-2048x1365.jpg 2048w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-3-600x400.jpg 600w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-3-1x1.jpg 1w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-3-10x7.jpg 10w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-06be3f6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"06be3f6\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-f0e6f6c\" data-id=\"f0e6f6c\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-35eb818 elementor-widget elementor-widget-image\" data-id=\"35eb818\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1997\" src=\"https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-2-scaled.jpg\" class=\"attachment-full size-full wp-image-7646\" alt=\"\" srcset=\"https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-2-scaled.jpg 2560w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-2-300x234.jpg 300w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-2-1024x799.jpg 1024w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-2-768x599.jpg 768w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-2-1536x1198.jpg 1536w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-2-2048x1598.jpg 2048w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-2-600x468.jpg 600w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-2-1x1.jpg 1w, https:\/\/tethys.farm\/wp-content\/uploads\/2023\/11\/prevenire-stress-idrico-indice-ndwi-2-10x8.jpg 10w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-b0fbdb7\" data-id=\"b0fbdb7\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-39266f4 elementor-widget elementor-widget-text-editor\" data-id=\"39266f4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Under conditions of full growth and development of crops, plants have a high water content and the NDWI takes on high values. If the water content of a crop is reduced, why in <strong>water stress<\/strong> (or because at the beginning\/end of maturation), also <strong>NDWI tends to decrease<\/strong> and takes values lower than 0.4. If problems persist and the crop is severely dehydrated, the NDWI takes on reduced values below 0.3.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b19a4e3 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b19a4e3\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-81f51c4\" data-id=\"81f51c4\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b455aad elementor-widget elementor-widget-text-editor\" data-id=\"b455aad\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Combining health status and phenological phase of crops,<strong> the different values of NDWI<\/strong> they can therefore be <strong>interpreted as follows<\/strong>:<\/p><p>NDVI Value Interpretation<br \/>&lt;0 Inanimate objects or cloud outlines<br \/>0.2 Severe water stress or newly planted\/already harvested crop<br \/>0.4 Severe water stress or newly planted\/senescent crop<br \/>0.5 Limited water content or developing\/senescent crop<br \/>0.6 Limited water content or developing\/senescent crop<br \/>0.7 High water content<br \/>1 Very high water content<\/p><p>Who wants to have one <strong>clearer view of the degree of humidity of the crops <\/strong>to choose the<strong> best time for harvesting,<\/strong> <strong>manage water resources more efficiently<\/strong> and make informed decisions to <strong>maximize productivity<\/strong> And <strong>overall sustainability<\/strong> of agricultural operations, cannot give up knowing the value of the NWDI index.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>The NDWI (Normalized Difference Water Index) is a crucial index in precision agriculture as it is able to measure the level of water contained in crops.<\/p>","protected":false},"author":2,"featured_media":7644,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[60],"tags":[64,62,66,61,86,63,65],"class_list":["post-7636","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-immagini-satellitari","tag-agricoltura-4-0","tag-agricoltura-di-precisione","tag-indici-vegetazionali","tag-monitoraggio-satellitare","tag-ndwi","tag-precision-farming","tag-satelliti"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - 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