“GEBCO\u2019s current gridded bathymetric data set, the GEBCO_2024 Grid, is a global terrain model for ocean and land, providing elevation data, in meters, on a 15 arc-second interval grid<\/strong>.”<\/p>\n\n\n\n it means that 1 arc-second = 1\/60 arc-minute = 1\/3600 arc-degree.<\/p>\n\n\n\n So, the distance for 1 degree in latitude is almost constant, although the distance in longitude varies from equator to poles. everything’s is explained here:<\/p>\n\n\n\n https:\/\/www.thoughtco.com\/degree-of-latitude-and-longitude-distance-4070616<\/a><\/p>\n\n\n\n For example, at 17\u00b0N, the X distance (Longitude) for 1 degree is about 106 km. The Y distance (Latitude) from 17\u00b0 to 18\u00b0 is about 111 km. Check it there:<\/p>\n\n\n\n https:\/\/www.nhc.noaa.gov\/gccalc.shtml<\/a><\/p>\n\n\n\n So, at 17\u00b0N : 106.34\/3600*15 = 0.44 km = 440m in longitude and 111.2\/3600*15 = 463 m in latitude<\/p>\n\n\n\n The grid produced by gebco is 440×463 m<\/p>\n\n\n\n It means that creating a 100m grid is a nonsense. And the resulting file will be enormous compared to the real resolution.<\/p>\n\n\n\n I often see gridded maps with a supposed resolution of 100m, even 5m in some cases ! Let’s be clear: it’s almost impossible. I will explain why with an example based on gebco bathymetric data. On the gebco website it is stated that: https:\/\/www.gebco.net\/data-products\/gridded-bathymetry-data “GEBCO\u2019s current gridded bathymetric data set, the GEBCO_2024 Grid, is a… Resolution of bathymetric maps<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[1],"tags":[12,56],"class_list":["post-483","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-bathymetry","tag-resolution"],"_links":{"self":[{"href":"http:\/\/aurelieng.fr\/index.php\/wp-json\/wp\/v2\/posts\/483","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/aurelieng.fr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/aurelieng.fr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/aurelieng.fr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/aurelieng.fr\/index.php\/wp-json\/wp\/v2\/comments?post=483"}],"version-history":[{"count":1,"href":"http:\/\/aurelieng.fr\/index.php\/wp-json\/wp\/v2\/posts\/483\/revisions"}],"predecessor-version":[{"id":484,"href":"http:\/\/aurelieng.fr\/index.php\/wp-json\/wp\/v2\/posts\/483\/revisions\/484"}],"wp:attachment":[{"href":"http:\/\/aurelieng.fr\/index.php\/wp-json\/wp\/v2\/media?parent=483"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/aurelieng.fr\/index.php\/wp-json\/wp\/v2\/categories?post=483"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/aurelieng.fr\/index.php\/wp-json\/wp\/v2\/tags?post=483"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/paleturquoise-reindeer-331443.hostingersite.com\/wp-content\/uploads\/2025\/04\/image-1024x368.png\")
<\/figure>\n","protected":false},"excerpt":{"rendered":"