Paper presented during the PhilGEOS x GeoAdvances 2019, 14\u201315 November 2019, Manila, Philippines <\/p>\n\n\n\n
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Abstract<\/p>\n\n\n\n
\n\nThe Department of Agriculture \u2013 Region VII reports that many mango orchards in Cebu province are dying because of the absence\nof required post-harvest attention. Lacklustre yields and erratic pest infestations have driven some farmers and growers to abandon\nmango orchards. To help revive low-yielding mango orchards, there is a need to distinguish actively bearing mango trees from\nthose that remain dormant throughout the year. Using remote sensing techniques, mango trees from separate orchards in Brgy.\nCantipay, Carmen, Cebu were mapped and studied using multi-temporal Sentinel-2 data (from January 2018 through May 2019).\nPrior to that, a field visit was conducted to survey the area using UAVs and field observation, and in the process, was able to\nidentify an abandoned mango orchard. Pixel-based Normal Difference Vegetation Index (NDVI) values were extracted from each\nof the 822 geotagged mango trees with an average of 16 trees among 53 divisions. Time series were derived from the average of\nthe NDVI values from each division and plotted per month of extraction from oldest to latest. Clustering was applied to the time\nseries data using Hierarchical Clustering with Ward\u2019s Minimum Variance as an algorithm to determine the divisions with the\nclosest time series. Using the resulting dendrogram as basis, two major clusters were selected based on the value of their distances\nwith each other: Cluster 1 containing 29 Divisions, and Cluster 2 containing 24 Divisions. Cluster 1 contains most of the Divisions\nin and around the biggest active mango orchard. In contrast, Cluster 2 contains most of the Divisions that are in and around the\npreviously identified abandoned mango orchard. An alternative dendrogram was also created by using Complete Linkage algorithm\nin Hierarchical Clustering, after which 3 relevant clusters were selected. The second dendrogram highlights the stark difference\nbetween Division 1, contained in Cluster 3, from the rest of the other clustered divisions at 2.17 units from the next closest one.\nNotably, Division 1 is located smack in the middle of the abandoned orchard The remaining clusters, Cluster 2 with 21 divisions\ncontaining most of the divisions in the abandoned orchard, is 2.46 distance units away from Cluster 1, which has 31 and hosting\nmost of the divisions in the active mango orchards. Two major clusters emerged from using the two algorithms. Divisions with\nhigher and more variant NDVI values seemed to come from the mango trees which were more active during the fruiting cycle.\nDivisions from the abandoned mango orchards were observed to have lower and less varied NDVI values because of minimal\nactivity in the trees. Other Divisions clustered under the abandoned orchard could have been juveniles based on their size\n\n<\/p>\n","protected":false},"excerpt":{"rendered":"
Paper presented during the PhilGEOS x GeoAdvances 2019, 14\u201315 November 2019, Manila, Philippines Abstract The Department of Agriculture \u2013 Region VII reports that many mango orchards in Cebu province are dying because of the absence of required post-harvest attention. Lacklustre yields and erratic pest infestations have driven some farmers and growers to abandon mango orchards. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[9],"tags":[],"class_list":["post-563","post","type-post","status-publish","format-standard","hentry","category-research-disseminations"],"_links":{"self":[{"href":"https:\/\/cvsc.upcebu.edu.ph\/index.php\/wp-json\/wp\/v2\/posts\/563","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cvsc.upcebu.edu.ph\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cvsc.upcebu.edu.ph\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cvsc.upcebu.edu.ph\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cvsc.upcebu.edu.ph\/index.php\/wp-json\/wp\/v2\/comments?post=563"}],"version-history":[{"count":0,"href":"https:\/\/cvsc.upcebu.edu.ph\/index.php\/wp-json\/wp\/v2\/posts\/563\/revisions"}],"wp:attachment":[{"href":"https:\/\/cvsc.upcebu.edu.ph\/index.php\/wp-json\/wp\/v2\/media?parent=563"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cvsc.upcebu.edu.ph\/index.php\/wp-json\/wp\/v2\/categories?post=563"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cvsc.upcebu.edu.ph\/index.php\/wp-json\/wp\/v2\/tags?post=563"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}