{"id":605,"date":"2017-11-14T16:28:24","date_gmt":"2017-11-14T15:28:24","guid":{"rendered":"http:\/\/jenacopterlabs.de\/?p=605"},"modified":"2018-06-04T13:38:11","modified_gmt":"2018-06-04T12:38:11","slug":"absolut-accuracy-of-the-phantom-4-pro-ortho-mosaic","status":"publish","type":"post","link":"https:\/\/jenacopterlabs.de\/?p=605","title":{"rendered":"Absolut Accuracy of the Phantom 4 Pro Ortho Mosaic"},"content":{"rendered":"<p>Some results from DGPS point measurements with a Stonex S9III GNSS DGPS receiver indicate an offset of 1.5-3 m to the Phantom 4 Pro ortho mosaic images. The relative accuracy is however much better. The Phantom 4 Pro derived ortho mosaic (without reference points) has a standard deviation of 0.31 to 0.36 m.<\/p>\n<p>When comparing the overall positional accuracy of the reference points its surprising that the UTM coordinates that come directly from the Phantom 4 Pro are not far off: I measured 12 DGPS points and found that the offset is between 150 cm and 290cm (compare with Fig. 6).<\/p>\n<p><strong>RMSE between the Stonex S9III DGPS (SAPOS) measured points and the DJI Phantom 4 pro POI mode ortho image mosaic measured points is 1,98 m (stdev 0,31\b m) and the RMSE between the Stonex Points and P4P NADIR mode ortho image mosaic measured points is 2,95 m (stdev 0,36 m). The difference is clearly also depending on overall atmosphere conditions and Stonex DGPS accuracy.\u00a0<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-602\" src=\"http:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts.jpg\" alt=\"dgps-point-comparison-12pts\" width=\"932\" height=\"935\" srcset=\"https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts.jpg 932w, https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts-150x150.jpg 150w, https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts-300x300.jpg 300w, https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts-768x770.jpg 768w\" sizes=\"auto, (max-width: 932px) 100vw, 932px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Fig. Comparison of measured DGPS Stonex GNSS points with in-Copter derived GPS geometry in POI ortho mosaic and with Nadir ortho mosaic processed in Agisoft in September 2017.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Some results from DGPS point measurements with a Stonex S9III GNSS DGPS receiver indicate an offset of 1.5-3 m to the Phantom 4 Pro ortho mosaic images. The relative accuracy is however much better. The Phantom 4 Pro derived ortho mosaic (without reference points) has a standard deviation of 0.31 to 0.36 m. When comparing the overall positional accuracy of&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":602,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[29,24],"tags":[18,17,13],"class_list":["post-605","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-agisoft","category-phantom","tag-phantom","tag-quadrocopter","tag-workflow"],"uagb_featured_image_src":{"full":["https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts.jpg",932,935,false],"thumbnail":["https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts-150x150.jpg",150,150,true],"medium":["https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts-300x300.jpg",300,300,true],"medium_large":["https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts-768x770.jpg",680,682,true],"large":["https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts.jpg",680,682,false],"1536x1536":["https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts.jpg",932,935,false],"2048x2048":["https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts.jpg",932,935,false],"post-thumbnail":["https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts.jpg",249,250,false],"cd-small":["https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts.jpg",150,150,false],"cd-medium":["https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts.jpg",249,250,false],"cd-standard":["https:\/\/jenacopterlabs.de\/wp-content\/uploads\/2016\/11\/DGPS-Point-Comparison-12pts.jpg",498,500,false]},"uagb_author_info":{"display_name":"S\u00f6ren Hese","author_link":"https:\/\/jenacopterlabs.de\/?author=1"},"uagb_comment_info":0,"uagb_excerpt":"Some results from DGPS point measurements with a Stonex S9III GNSS DGPS receiver indicate an offset of 1.5-3 m to the Phantom 4 Pro ortho mosaic images. The relative accuracy is however much better. The Phantom 4 Pro derived ortho mosaic (without reference points) has a standard deviation of 0.31 to 0.36 m. When comparing&hellip;","_links":{"self":[{"href":"https:\/\/jenacopterlabs.de\/index.php?rest_route=\/wp\/v2\/posts\/605","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jenacopterlabs.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jenacopterlabs.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jenacopterlabs.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jenacopterlabs.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=605"}],"version-history":[{"count":10,"href":"https:\/\/jenacopterlabs.de\/index.php?rest_route=\/wp\/v2\/posts\/605\/revisions"}],"predecessor-version":[{"id":616,"href":"https:\/\/jenacopterlabs.de\/index.php?rest_route=\/wp\/v2\/posts\/605\/revisions\/616"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jenacopterlabs.de\/index.php?rest_route=\/wp\/v2\/media\/602"}],"wp:attachment":[{"href":"https:\/\/jenacopterlabs.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=605"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jenacopterlabs.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=605"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jenacopterlabs.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=605"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}