{"id":55,"date":"2018-07-15T15:11:08","date_gmt":"2018-07-15T15:11:08","guid":{"rendered":"http:\/\/wcwp.rf.gd\/2018\/07\/15\/https-landscapearchaeology-org-2018-visibility-test-nuraghi\/"},"modified":"2018-07-15T15:11:08","modified_gmt":"2018-07-15T15:11:08","slug":"visibility-test-nuraghi","status":"publish","type":"post","link":"https:\/\/landscapeanalysis.org\/?p=55","title":{"rendered":"Benchmarking viewshed algorithm: Nuraghi of Sardinia"},"content":{"rendered":"<p>The new <a href=\"https:\/\/landscapeanalysis.org\/2018\/visibility-analysis-0-6\/\">viewshed plugin for QGIS 3<\/a> features an improved algorithm which should result in perceptible improvements in terms of efficiency. So let\u2019s give it a try!<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/a\/a1\/Torralba_San_Antine_10.JPG\/640px-Torralba_San_Antine_10.JPG\" \/><figcaption>Nuraghe in Toralba-Sant&#8217;Antine \u00a9 Michel Royon \/ Wikimedia Commons<\/figcaption><\/figure>\n<p>The test data I\u2019m using are the famous nuraghi of Sardinia, drystone towers dating to the 2. millennium BC. These structures, sometimes combining in small settlements, are extremely numerous on the island. There are some 7000 documented sites, which means much more were originally present. Such quantities of archaeological sites are exceptional for European Bronze Age.<\/p>\n<p>A list of Sardinan nuraghi is available on <a href=\"http:\/\/nurnet.crs4.it\/nurnetgeo\">nurnet.crs4.it\/nurnetgeo<\/a>, which is great! (Thanks archaeologists!). It is not a scientific database, however, I\u2019m using it for fun.<br \/>\nElevation model used is the EU-DEM with 25 meters resolution.<\/p>\n<p><strong>Result<\/strong>: for cumulative viewshed from 6013 nuraghi, in 5 km radius and observation point 10 metres high, I needed some <strong>two and a half minutes<\/strong>. My computer has 8 gigabyte RAM and Intel Core i5-3437U @ 1.90GHz. I\u2019m quite happy with this result \ud83d\ude42<\/p>\n<figure><img decoding=\"async\" src=\"http:\/\/landscapearchaeology.org\/wp-content\/uploads\/figures-jekyll\/2018\/07\/Sardegna-nuraghi.jpg\" \/><figcaption>Intensity of visual exposure of Sardinian nuraghi<\/figcaption><\/figure>\n<h2 id=\"further-information\">Further information<\/h2>\n<p><a href=\"https:\/\/google.com\/search?q=nuraghi\">Google on Nuraghi<\/a><\/p>\n<p><a href=\"http:\/\/www.nurnet.it\">Nuraghi initiative (and database)<\/a><\/p>\n<p><a href=\"https:\/\/www.eea.europa.eu\/data-and-maps\/data\/copernicus-land-monitoring-service-eu-dem\">EU-DEM (elevation model)<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The new viewshed plugin for QGIS 3 features an improved algorithm which should result in perceptible improvements in terms of efficiency. So let\u2019s give it a try! Nuraghe in Toralba-Sant&#8217;Antine \u00a9 Michel Royon \/ Wikimedia Commons The test data I\u2019m using are the famous nuraghi of Sardinia, drystone towers dating to the 2. millennium BC. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[11,13],"class_list":["post-55","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-qgis","tag-qgis-visibility-plugin"],"_links":{"self":[{"href":"https:\/\/landscapeanalysis.org\/index.php?rest_route=\/wp\/v2\/posts\/55","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/landscapeanalysis.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/landscapeanalysis.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/landscapeanalysis.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/landscapeanalysis.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=55"}],"version-history":[{"count":0,"href":"https:\/\/landscapeanalysis.org\/index.php?rest_route=\/wp\/v2\/posts\/55\/revisions"}],"wp:attachment":[{"href":"https:\/\/landscapeanalysis.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=55"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/landscapeanalysis.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=55"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/landscapeanalysis.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=55"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}