{"id":241,"date":"2002-12-01T12:23:11","date_gmt":"2002-12-01T10:23:11","guid":{"rendered":"http:\/\/www.mpateraki.org\/?p=241"},"modified":"2015-01-21T12:47:34","modified_gmt":"2015-01-21T10:47:34","slug":"orthophoto-generation-using-ikonos-imagery-and-high-resolution-dem-study-case-on-volcanic-hazard-monitoring-of-nisyros-island-greece","status":"publish","type":"post","link":"https:\/\/mpateraki.org\/?p=241","title":{"rendered":"Orthophoto Generation Using Ikonos Imagery and High Resolution DEM: Study Case on Volcanic Hazard Monitoring of Nisyros Island (Greece)"},"content":{"rendered":"<p>Vassilopoulou S., Hurni L., Dietrich V., Baltsavias E., <strong>Pateraki M.<\/strong>, Lagios E., Parcharidis I., 2002. Orthophoto Generation Using Ikonos Imagery and High Resolution DEM: Study Case on Volcanic Hazard Monitoring of Nisyros Island (Greece). ISPRS Journal of Photogrammetry and Remote Sensing, 57(1-2), pp. 24-38. [<a href=\"http:\/\/dx.doi.org\/10.1016\/S0924-2716%2802%2900126-0\" target=\"_blank\">doi<\/a>] [<a href=\"http:\/\/www.mpateraki.org\/wp-content\/uploads\/2014\/11\/isprs_57.pdf\" target=\"_blank\">pdf<\/a>] [<a href=\"http:\/\/www.mpateraki.org\/wp-content\/uploads\/2015\/01\/vasilopoulou02.txt\" target=\"_blank\">bib<\/a>]<\/p>\n<p>Abstract:<\/p>\n<p>Georeferenced high-resolution satellite images can be used for acquisition of topographic information, navigation and\u00a0visualisation for various environmental studies. The present study is part of the multidisciplinary EU project GEOWARN\u00a0related to monitoring, warning and emergency planning for volcanic hazards in the island of Nisyros, Greece. Here, the main\u00a0aim was the orthorectification of a 1-m resolution pan-sharpened IKONOS Geo image of Nisyros island. For the\u00a0orthorectification, a digital elevation model (DEM) with a cell size of 2 m and an RMS accuracy of ca. 3.5 m was used, as well\u00a0as 38 selected ground control points (GCPs) measured with differential GPS. An object-to-pixel space transformation using the\u00a0ground control points was computed using two different models, a relief-corrected affine transformation and the polynomial\u00a0mapping functions of Kratky. These transformations were used for orthorectification and the orthophoto accuracy was evaluated\u00a0using GCPs as check points. Postprocessing for radiometric improvement of the orthophotos was applied. The orthophoto and\u00a0the DEM served as basic tools for subsequent base mapping and visualisation.<\/p>\n<table align=\"center\">\n<tbody align=\"center\">\n<tr align=\"center\">\n<td align=\"center\" width=\"50%\"><a href=\"http:\/\/www.mpateraki.org\/wp-content\/uploads\/2002\/12\/nisiros.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-245\" src=\"http:\/\/www.mpateraki.org\/wp-content\/uploads\/2002\/12\/nisiros.jpg\" alt=\"\" width=\"467\" height=\"303\" srcset=\"https:\/\/mpateraki.org\/wp-content\/uploads\/2002\/12\/nisiros.jpg 667w, https:\/\/mpateraki.org\/wp-content\/uploads\/2002\/12\/nisiros-300x194.jpg 300w\" sizes=\"auto, (max-width: 467px) 100vw, 467px\" \/><\/a><\/td>\n<td align=\"center\" width=\"50%\"><a href=\"http:\/\/www.mpateraki.org\/wp-content\/uploads\/2002\/12\/3d.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-244\" src=\"http:\/\/www.mpateraki.org\/wp-content\/uploads\/2002\/12\/3d.jpg\" alt=\"\" width=\"323\" height=\"260\" srcset=\"https:\/\/mpateraki.org\/wp-content\/uploads\/2002\/12\/3d.jpg 533w, https:\/\/mpateraki.org\/wp-content\/uploads\/2002\/12\/3d-300x241.jpg 300w\" sizes=\"auto, (max-width: 323px) 100vw, 323px\" \/><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>Vassilopoulou S., Hurni L., Dietrich V., Baltsavias E., Pateraki M., Lagios E., Parcharidis I., 2002. Orthophoto Generation Using Ikonos Imagery and High Resolution DEM: Study Case on Volcanic Hazard Monitoring of Nisyros Island (Greece). ISPRS Journal of Photogrammetry and Remote Sensing, 57(1-2), pp. 24-38. [doi] [pdf] [bib] Abstract: Georeferenced high-resolution satellite images can be used [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":245,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-241","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-publications"],"_links":{"self":[{"href":"https:\/\/mpateraki.org\/index.php?rest_route=\/wp\/v2\/posts\/241","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mpateraki.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mpateraki.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mpateraki.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mpateraki.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=241"}],"version-history":[{"count":8,"href":"https:\/\/mpateraki.org\/index.php?rest_route=\/wp\/v2\/posts\/241\/revisions"}],"predecessor-version":[{"id":251,"href":"https:\/\/mpateraki.org\/index.php?rest_route=\/wp\/v2\/posts\/241\/revisions\/251"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mpateraki.org\/index.php?rest_route=\/wp\/v2\/media\/245"}],"wp:attachment":[{"href":"https:\/\/mpateraki.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mpateraki.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=241"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mpateraki.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}