{"id":962,"date":"2014-01-28T07:00:30","date_gmt":"2014-01-28T12:00:30","guid":{"rendered":"https:\/\/blogs.mathworks.com\/steve\/?p=962"},"modified":"2014-01-23T10:49:28","modified_gmt":"2014-01-23T15:49:28","slug":"update-to-topotoolbox","status":"publish","type":"post","link":"https:\/\/blogs.mathworks.com\/steve\/2014\/01\/28\/update-to-topotoolbox\/","title":{"rendered":"Update to TopoToolbox"},"content":{"rendered":"<p>\r\nIn 2007 I did a series of blog posts on developing MATLAB algorithms for a topological measurement called upslope area, a measurement related to digital elevation models (DEMs). The upslope area of a point (pixel) is the total area on the terrain above that point that drains through it. I formulated the computation of upslope area as a sparse linear system, which let me put the MATLAB backslash operator to good use, and I put my upslope area functions on the <a href=\"https:\/\/www.mathworks.com\/matlabcentral\/fileexchange\/15818-upslope-area-functions\">File Exchange<\/a>.\r\n<\/p>\r\n\r\n<p>\r\nAt about the same time, File Exchange contributor Wolfgang Schwanghart was developing a similar approach, which he made available as the TopoToolbox.\r\n<\/p>\r\n\r\n<p>\r\nI just heard from Wolfgang that a new version of the TopoToolbox is available. It is described in the paper Schwangart and Scherler, <a href=\"http:\/\/www.earth-surf-dynam.net\/2\/1\/2014\/esurf-2-1-2014.html\">TopoToolbox 2 \u2013 MATLAB-based software for topographic analysis and modeling in Earth surface sciences<\/a>, <em>Earth Surface Dynamics<\/em>, 2014.\r\n<\/p>\r\n\r\n<p>\r\nThe new version features improved memory efficiency and speed, new analysis algorithms, and interactive apps for visual exploration and interaction with DEMs. Here's a figure from the paper:\r\n<\/p>\r\n\r\n<p>\r\n<a href=\"https:\/\/blogs.mathworks.com\/steve\/files\/Screen-Shot-2014-01-23-at-10.42.57-AM.png\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/blogs.mathworks.com\/steve\/files\/Screen-Shot-2014-01-23-at-10.42.57-AM-300x220.png\" alt=\"Screen Shot 2014-01-23 at 10.42.57 AM\" width=\"300\" height=\"220\" class=\"alignnone size-medium wp-image-965\" \/><\/a>\r\n<\/p>\r\n\r\n<p>\r\nYou can find TopoToolbox <a href=\"http:\/\/csdms.colorado.edu\/wiki\/Model:TopoToolbox\">here<\/a>. If you are interested in analytical and interactive tools for DEM analysis, you should give it a try.\r\n<\/p>","protected":false},"excerpt":{"rendered":"<div class=\"overview-image\"><img decoding=\"async\"  class=\"img-responsive\" src=\"https:\/\/blogs.mathworks.com\/steve\/files\/Screen-Shot-2014-01-23-at-10.42.57-AM-300x220.png\" onError=\"this.style.display ='none';\" \/><\/div><p>\r\nIn 2007 I did a series of blog posts on developing MATLAB algorithms for a topological measurement called upslope area, a measurement related to digital elevation models (DEMs). The upslope area of... <a class=\"read-more\" href=\"https:\/\/blogs.mathworks.com\/steve\/2014\/01\/28\/update-to-topotoolbox\/\">read more >><\/a><\/p>","protected":false},"author":42,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/posts\/962"}],"collection":[{"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/users\/42"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/comments?post=962"}],"version-history":[{"count":9,"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/posts\/962\/revisions"}],"predecessor-version":[{"id":972,"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/posts\/962\/revisions\/972"}],"wp:attachment":[{"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/media?parent=962"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/categories?post=962"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/steve\/wp-json\/wp\/v2\/tags?post=962"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}