{"id":15175,"date":"2026-02-26T11:16:04","date_gmt":"2026-02-26T17:16:04","guid":{"rendered":"https:\/\/www.agron.iastate.edu\/glsi\/?p=15175"},"modified":"2026-02-26T11:23:48","modified_gmt":"2026-02-26T17:23:48","slug":"us-soil-survey-ssurgo-structure","status":"publish","type":"post","link":"https:\/\/www.agron.iastate.edu\/glsi\/bohn\/teaching\/us-soil-survey-ssurgo-structure\/","title":{"rendered":"The Nitty Gritty on Soils Data"},"content":{"rendered":"\n<div class=\"wp-block-stackable-feature stk-block-feature stk-block stk-0af2e38 is-style-default\" data-v=\"2\" data-block-id=\"0af2e38\"><style>.stk-0af2e38 {--stk-feature-flex-wrap:nowrap !important;}<\/style><div class=\"stk-content-align stk-0af2e38-column stk-container stk-0af2e38-container stk--no-background stk--no-padding\"><div class=\"stk-inner-blocks stk-block-content stk-row\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-4f7d9ff\" data-v=\"4\" data-block-id=\"4f7d9ff\"><style>.stk-4f7d9ff {align-self:center !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-4f7d9ff-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-4f7d9ff-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-c11710a\" id=\"a-comprehensive-overview-of-the-soil-survey-geographic-ssurgo-database-lecture-digital-ag-and-data-science\" data-block-id=\"c11710a\"><h2 class=\"stk-block-heading__text\">A comprehensive overview of the Soil Survey Geographic (SSURGO) database- Lecture &#8211; Digital Ag and Data Science<\/h2><\/div>\n\n\n\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-c5c6ee9\" data-block-id=\"c5c6ee9\"><p class=\"stk-block-text__text\">This lecture traces the development of soil survey in the United States and the evolution of soil science as a predictive framework. It focuses on how soil maps are built from field observations and landscape relationships, and how that knowledge is encoded within the SSURGO database. Key elements of SSURGO structure are covered, including map units, components, horizons, and interpretive properties. The lecture also highlights core assumptions, limitations, and sources of bias in conventional soil survey, and introduces tools used to access, interpret, and apply these data.<\/p><\/div>\n\n\n\n<div class=\"wp-block-stackable-button-group stk-block-button-group stk-block stk-c61f06e\" data-block-id=\"c61f06e\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-button-group\">\n<div class=\"wp-block-stackable-button stk-block-button stk-block stk-0f3b822\" data-block-id=\"0f3b822\"><a class=\"stk-link stk-button stk--hover-effect-darken\" href=\"https:\/\/iastate.box.com\/v\/ssurgo-database\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"stk-button__inner-text\">View or Download on Box<\/span><\/a><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-6792b13\" data-v=\"4\" data-block-id=\"6792b13\"><style>.stk-6792b13 {align-self:center !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-6792b13-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-6792b13-inner-blocks\">\n<div class=\"wp-block-stackable-image stk-block-image stk-block stk-9e54fff\" data-block-id=\"9e54fff\"><figure><span class=\"stk-img-wrapper stk-image--shape-stretch\"><img loading=\"lazy\" decoding=\"async\" class=\"stk-img wp-image-15176\" src=\"https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Soilsurveydigitization.jpg\" width=\"636\" height=\"715\" srcset=\"https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Soilsurveydigitization.jpg 636w, https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Soilsurveydigitization-267x300.jpg 267w\" sizes=\"auto, (max-width: 636px) 100vw, 636px\" \/><\/span><\/figure><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div><\/div>\n\n\n<div class=\"paragraph-widget paragraph-widget--text-html\"><div class=\"text-content\">\n<p><\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>A comprehensive overview of the Soil Survey Geographic (SSURGO) database- Lecture &#8211; Digital Ag and Data Science This lecture traces the development of soil survey in the United States and the evolution of soil science as a predictive framework. It focuses on how soil maps are built from field observations and landscape relationships, and how [&hellip;]<\/p>\n","protected":false},"author":3348,"featured_media":15176,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[11,365],"tags":[170,369,121],"class_list":["post-15175","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bohn","category-teaching","tag-gssurgo","tag-public-soil-data","tag-soil-maps"],"acf":[],"featured_image_urls_v2":{"full":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Soilsurveydigitization.jpg",636,715,false],"thumbnail":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Soilsurveydigitization-150x150.jpg",150,150,true],"medium":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Soilsurveydigitization-267x300.jpg",267,300,true],"medium_large":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Soilsurveydigitization.jpg",636,715,false],"large":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Soilsurveydigitization.jpg",636,715,false],"1536x1536":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Soilsurveydigitization.jpg",636,715,false],"2048x2048":["https:\/\/www.agron.iastate.edu\/glsi\/files\/2026\/02\/Soilsurveydigitization.jpg",636,715,false]},"post_excerpt_stackable_v2":"<p>A comprehensive overview of the Soil Survey Geographic (SSURGO) database- Lecture &#8211; Digital Ag and Data Science This lecture traces the development of soil survey in the United States and the evolution of soil science as a predictive framework. It focuses on how soil maps are built from field observations and landscape relationships, and how that knowledge is encoded within the SSURGO database. Key elements of SSURGO structure are covered, including map units, components, horizons, and interpretive properties. The lecture also highlights core assumptions, limitations, and sources of bias in conventional soil survey, and introduces tools used to access, interpret,&hellip;<\/p>\n","category_list_v2":"<a href=\"https:\/\/www.agron.iastate.edu\/glsi\/category\/bohn\/\" rel=\"category tag\">Bohn<\/a>, <a href=\"https:\/\/www.agron.iastate.edu\/glsi\/category\/bohn\/teaching\/\" rel=\"category tag\">Teaching<\/a>","author_info_v2":{"name":"Meyer Bohn","url":"https:\/\/www.agron.iastate.edu\/glsi\/author\/mpbohn\/"},"comments_num_v2":"0 comments","yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Nitty Gritty on Soils Data - Geospatial Laboratory for Soil Informatics<\/title>\n<meta name=\"description\" content=\"Lecture on the origins of U.S. soil survey and the structure of SSURGO, including map units, properties, interpretations, and limitations of conventional soil mapping.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.agron.iastate.edu\/glsi\/bohn\/teaching\/us-soil-survey-ssurgo-structure\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Nitty Gritty on Soils Data - 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