{"id":42019,"date":"2016-02-18T15:20:00","date_gmt":"2016-02-18T15:20:00","guid":{"rendered":"http:\/\/ahay.org\/blog\/?p=42019"},"modified":"2016-03-18T14:21:15","modified_gmt":"2016-03-18T14:21:15","slug":"program-of-the-month-sfmig2","status":"publish","type":"post","link":"https:\/\/ahay.org\/blog\/2016\/02\/18\/program-of-the-month-sfmig2\/","title":{"rendered":"Program of the month: sfmig2"},"content":{"rendered":"<p><a href=\"\/RSF\/sfmig2.html\">sfmig2<\/a> implements 2-D prestack Kirchhoff time migration. <\/p>\n<p>The program is using triangle antialiasing filters.<\/p>\n<blockquote>\n<p>J. F. Claerbout, 1992, Anti Aliasing: SEP-73, Stanford Exploration Project, 371-390.<\/p>\n<p>D. E. Lumley, J. F. Claerbout, and D. Bevc, 1994, Anti-aliased Kirchhoff 3-D migration: SEG Annual Meeting, Expanded Abstracts, 1282-1285. <\/p>\n<\/blockquote>\n<p>The following example from <a href=\"\/RSF\/book\/sep\/aal\/gulf.html\">sep\/aal\/gulf<\/a> shows migration applied to a near-offset section from the Gulf of Mexico.<\/p>\n<p><img decoding=\"async\" src=\"\/RSF\/book\/sep\/aal\/gulf\/Fig\/Gulfaa.png\" alt=\"\" title=\"\" \/><\/p>\n<p>The amount of antialiasing is controlled by <strong>antialias=<\/strong> parameter.<\/p>\n<p>A half-derivative waveform-correction filter (rho filter) is applied and is controlled by <strong>rho=<\/strong> parameter.<\/p>\n<p>The program has an adjoint flag <strong>adj=<\/strong> and can be used as a linear operator. The default value <strong>adj=y<\/strong> corresponds to migration, <strong>adj=n<\/strong> corresponds to modeling (demigration).<\/p>\n<p>An additional required input is <strong>vel=<\/strong> (time-migration velocity). An optional output is <strong>gather=<\/strong> (common-offset image gathers).<\/p>\n<h3 id=\"10previousprogramsofthemonth\">10 previous programs of the month:<\/h3>\n<ul>\n<li><a href=\"\/blog\/2016\/01\/16\/program-of-the-month-sfsort\/\">sfsort<\/a><\/li>\n<li><a href=\"\/blog\/2015\/12\/22\/program-of-the-month-sfdivn\/\">sfdivn<\/a><\/li>\n<li><a href=\"\/blog\/2015\/11\/16\/program-of-the-month-sfpldb-and-sfplas\/\">sfpldb and sfplas<\/a><\/li>\n<li><a href=\"\/blog\/2015\/10\/15\/program-of-the-month-sfisolr2\/\">sfisolr2<\/a><\/li>\n<li><a href=\"\/blog\/2015\/09\/14\/program-of-the-month-sfsimilarity\/\">sfsimilarity<\/a><\/li>\n<li><a href=\"\/blog\/2015\/07\/10\/program-of-the-month-sfmutter\/\">sfmutter<\/a><\/li>\n<li><a href=\"\/blog\/2015\/06\/10\/program-of-the-month-sfintbin\/\">sfintbin<\/a><\/li>\n<li><a href=\"\/blog\/2015\/05\/01\/program-of-the-month-sfbox\/\">sfbox<\/a><\/li>\n<li><a href=\"\/blog\/2015\/04\/21\/program-of-the-month-sfslant\/\">sfslant<\/a><\/li>\n<li><a href=\"\/blog\/2015\/03\/04\/program-of-the-month-sfgrey\/\">sfgrey<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>sfmig2 implements 2-D prestack Kirchhoff time migration. The program is using triangle antialiasing filters. J. F. Claerbout, 1992, Anti Aliasing: SEP-73, Stanford Exploration Project, 371-390. D. E. Lumley, J. F. Claerbout, and D. Bevc, 1994, Anti-aliased Kirchhoff 3-D migration: SEG Annual Meeting, Expanded Abstracts, 1282-1285. The following example from sep\/aal\/gulf shows migration applied to a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","activitypub_content_warning":"","activitypub_content_visibility":"local","activitypub_max_image_attachments":4,"activitypub_interaction_policy_quote":"","footnotes":""},"categories":[3],"tags":[],"class_list":["post-42019","post","type-post","status-publish","format-standard","hentry","category-programs"],"_links":{"self":[{"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/posts\/42019","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/comments?post=42019"}],"version-history":[{"count":5,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/posts\/42019\/revisions"}],"predecessor-version":[{"id":49036,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/posts\/42019\/revisions\/49036"}],"wp:attachment":[{"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/media?parent=42019"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/categories?post=42019"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/tags?post=42019"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}