{"id":861,"date":"2013-01-23T14:00:40","date_gmt":"2013-01-23T14:00:40","guid":{"rendered":"http:\/\/all-geo.org\/volcan01010\/?p=861"},"modified":"2013-01-23T09:42:40","modified_gmt":"2013-01-23T09:42:40","slug":"processing-arsf-remote-sensing-data-with-open-source-gis-tools","status":"publish","type":"post","link":"https:\/\/all-geo.org\/volcan01010\/2013\/01\/processing-arsf-remote-sensing-data-with-open-source-gis-tools\/","title":{"rendered":"Processing ARSF remote sensing data with open source GIS tools"},"content":{"rendered":"<dl>\n<div id=\"attachment_867\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/all-geo.org\/volcan01010\/wp-content\/uploads\/2013\/01\/drape.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-867\" class=\"size-full wp-image-867\" src=\"http:\/\/all-geo.org\/volcan01010\/wp-content\/uploads\/2013\/01\/drape_600.png\" alt=\"\" width=\"600\" height=\"337\" srcset=\"https:\/\/all-geo.org\/volcan01010\/wp-content\/uploads\/2013\/01\/drape_600.png 600w, https:\/\/all-geo.org\/volcan01010\/wp-content\/uploads\/2013\/01\/drape_600-300x168.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><p id=\"caption-attachment-867\" class=\"wp-caption-text\">Orthorectified aerial photographs of the Nesjahraun, Iceland, draped over LiDAR-derived topography visualised in GRASS\u2019s NVIZ module.  Click to enlarge.<\/p><\/div>\n<\/dl>\n<p>The UK National Environment Research Council\u2019s Airborne Research and Survey Facility (<a href=\"http:\/\/arsf.nerc.ac.uk\/\" target=\"_blank\">NERC ARSF<\/a>) is an aircraft used for scientific research. The <a href=\"http:\/\/arsf.nerc.ac.uk\/instruments\/\" target=\"_blank\">on-board instruments<\/a> include LiDAR, high resolution camera, and multispectral and hyperspectral infrared scanners.\u00a0 The aim of this post is to share an article and slides from a talk that I gave in 2009 that demonstrate how these data can be processed with free and open source tools.<\/p>\n<p>The slides and articles also illustrate some of the ways that GRASS GIS can be used to process remote sensing data in general.<\/p>\n<ul>\n<li> Talk slides: <a href=\"http:\/\/xweb.geos.ed.ac.uk\/~jsteven5\/blog\/GRASS_remote_sensing_slides.pdf\" target=\"_blank\">From ASCII files to orthophotos: The processing of high-resolution aerial survey data using open source GIS software<\/a>. (6.7 Mb)<\/li>\n<li> Article: <a href=\"http:\/\/xweb.geos.ed.ac.uk\/~jsteven5\/blog\/GRASS_remote_sensing_article.pdf\" target=\"_blank\">From ASCII files to orthophotos: The processing of high-resolution aerial survey data using open source GIS software<\/a>. (1.1 Mb)<\/li>\n<\/ul>\n<h3>Getting started with GRASS GIS<\/h3>\n<div id=\"attachment_862\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/all-geo.org\/volcan01010\/wp-content\/uploads\/2013\/01\/multipart.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-862\" class=\"size-full wp-image-862\" src=\"http:\/\/all-geo.org\/volcan01010\/wp-content\/uploads\/2013\/01\/multipart_600.png\" alt=\"\" width=\"600\" height=\"212\" srcset=\"https:\/\/all-geo.org\/volcan01010\/wp-content\/uploads\/2013\/01\/multipart_600.png 600w, https:\/\/all-geo.org\/volcan01010\/wp-content\/uploads\/2013\/01\/multipart_600-300x106.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><p id=\"caption-attachment-862\" class=\"wp-caption-text\">Multispectral infrared data channels combined in GRASS to highlight different landscape\/vegetation features. If you have visited Iceland, you may recognise the Nesjavellir geothermal plant, with its steam and warm river.  Click the image to enlarge.<\/p><\/div>\n<p><a href=\"http:\/\/grass.osgeo.org\/\" target=\"_blank\">GRASS GIS<\/a> is a fully-featured <a href=\"http:\/\/en.wikipedia.org\/wiki\/Free_and_open_source_software\" target=\"_blank\">open source<\/a> GIS package.\u00a0 In talk and article I describe using it to process LiDAR point clouds, orthorectify aerial photos, calculate slope\/aspect maps, digitise geological information, import field data and to visualise and export data in a variety of formats.\u00a0 From a remote-sensing perspective, the <a href=\"http:\/\/wgbis.ces.iisc.ernet.in\/grass\/gdp\/html_grass64\/imageryintro.html\" target=\"_blank\">Image Processing features<\/a> include things like image classification and fusion.<\/p>\n<p>Early versions of GRASS were mainly command-line based, so the learning curve can be a bit steep, but the GUI has improved significantly (especially from 6.4.2 onwards).\u00a0 The command line has the advantage of easy scripting, and the latest versions are moving to Python which will make it simple to include GIS processing in other workflows.<\/p>\n<p>The following tips will help you get started with GRASS:<\/p>\n<ul>\n<li>Install GRASS from the <a href=\"http:\/\/grass.osgeo.org\/\" target=\"_blank\">website<\/a>.\u00a0 As it was initially developed on the UNIX operating system, the Linux and Mac versions are better.\u00a0 Windows users should install the <a href=\"http:\/\/trac.osgeo.org\/osgeo4w\/wiki\/pkg-grass\" target=\"_blank\">OSGeo4W package<\/a>, which also includes a number of other useful programs e.g. <a href=\"http:\/\/qgis.osgeo.org\/\" target=\"_blank\">QGIS<\/a>.<\/li>\n<li>Download+print\/buy a copy of <a href=\"http:\/\/link.springer.com\/book\/10.1007\/978-0-387-68574-8\/page\/1\" target=\"_blank\">Open Source GIS: A GRASS GIS Approach<\/a> and have an actual physical copy beside you as you work.\u00a0 It is an excellent reference.<\/li>\n<li>Visit the pages for <a href=\"http:\/\/grass.osgeo.org\/documentation\/first-time-users\/\" target=\"_blank\">first time users<\/a> on the GRASS website and learn about locations and mapsets.<\/li>\n<li>Join the <a href=\"http:\/\/lists.osgeo.org\/mailman\/listinfo\/grass-user\" target=\"_blank\">&#8216;grass-user&#8217; mailing list<\/a>.\u00a0 Your questions will be answered very quickly (often by the developers themselves) and you can see examples of how others use it.<\/li>\n<li>Bookmark the <a href=\"http:\/\/grass.osgeo.org\/documentation\/search-engine\/\" target=\"_blank\">GRASS Search Engine<\/a>, where you can often find answers in the mailing list archives.<\/li>\n<\/ul>\n<h3>Further reading<\/h3>\n<p><span style=\"color: #000000\"><span style=\"font-family: Times New Roman\"><span style=\"font-size: small\"> <\/span><\/span><\/span><\/p>\n<div id=\"attachment_868\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/all-geo.org\/volcan01010\/wp-content\/uploads\/2013\/01\/google_earth.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-868\" class=\"size-full wp-image-868\" src=\"http:\/\/all-geo.org\/volcan01010\/wp-content\/uploads\/2013\/01\/google_earth_600.png\" alt=\"\" width=\"600\" height=\"337\" srcset=\"https:\/\/all-geo.org\/volcan01010\/wp-content\/uploads\/2013\/01\/google_earth_600.png 600w, https:\/\/all-geo.org\/volcan01010\/wp-content\/uploads\/2013\/01\/google_earth_600-300x168.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><p id=\"caption-attachment-868\" class=\"wp-caption-text\">Orthorectified aerial photographs of the Nesjahraun, combined with digitised field data exported to GoogleEarth via GDAL.  Click to enlarge.<\/p><\/div>\n<p>To see a list of open source tools useful to geoscientists, see <a href=\"http:\/\/all-geo.org\/volcan01010\/2011\/11\/all-the-software-a-geoscientists-needs-for-free\/\" target=\"_blank\">All the software a geoscientist needs: For free!<\/a> There is also a list on Wikipedia of <a href=\"http:\/\/en.wikipedia.org\/wiki\/Free_and_open_source_software\" target=\"_blank\">free and open source geophysics software<\/a>.<\/p>\n<p>The data that I processed was used in a study of an Icelandic lava flow that went into a lake.\u00a0 You can see how it was used in the following articles:<\/p>\n<ol>\n<li>Stevenson, J. A., N. C. Mitchell, M. Cassidy, and H.  Pinkerton (2011), Widespread inflation and drainage of a pahoehoe flow  field: the Nesjahraun, \u00deingvellir, Iceland. Bulletin of Volcanology,  doi:<a href=\"http:\/\/dx.doi.org\/10.1007\/s00445-011-0482-z\">10.1007\/s00445-011-0482-z<\/a>.<\/li>\n<li>Stevenson, J. A., N. C. Mitchell, F. Mochrie, M. Cassidy, and  H. Pinkerton (2011), Lava penetrating water: the different behaviours  of pahoehoe and \u2018a\u2018a at the Nesjahraun, \u00deingvellir, Iceland. Bulletin of  Volcanology, doi:<a href=\"http:\/\/dx.doi.org\/10.1007\/s00445-011-0480-1\">10.1007\/s00445-011-0480-1<\/a>.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>The UK National Environment Research Council\u2019s Airborne Research and Survey Facility (NERC ARSF) is an aircraft used for scientific research. The on-board instruments include LiDAR, high resolution camera, and multispectral and hyperspectral infrared scanners.\u00a0 The aim of this post is &hellip; <a href=\"https:\/\/all-geo.org\/volcan01010\/2013\/01\/processing-arsf-remote-sensing-data-with-open-source-gis-tools\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-861","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/all-geo.org\/volcan01010\/wp-json\/wp\/v2\/posts\/861","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/all-geo.org\/volcan01010\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/all-geo.org\/volcan01010\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/all-geo.org\/volcan01010\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/all-geo.org\/volcan01010\/wp-json\/wp\/v2\/comments?post=861"}],"version-history":[{"count":10,"href":"https:\/\/all-geo.org\/volcan01010\/wp-json\/wp\/v2\/posts\/861\/revisions"}],"predecessor-version":[{"id":878,"href":"https:\/\/all-geo.org\/volcan01010\/wp-json\/wp\/v2\/posts\/861\/revisions\/878"}],"wp:attachment":[{"href":"https:\/\/all-geo.org\/volcan01010\/wp-json\/wp\/v2\/media?parent=861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/all-geo.org\/volcan01010\/wp-json\/wp\/v2\/categories?post=861"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/all-geo.org\/volcan01010\/wp-json\/wp\/v2\/tags?post=861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}