{"id":321,"date":"2013-03-10T21:03:00","date_gmt":"2013-03-10T21:03:00","guid":{"rendered":"http:\/\/ahay.org\/blog\/?p=321"},"modified":"2016-02-03T19:34:57","modified_gmt":"2016-02-03T19:34:57","slug":"program-of-the-month-sfpow","status":"publish","type":"post","link":"https:\/\/ahay.org\/blog\/2013\/03\/10\/program-of-the-month-sfpow\/","title":{"rendered":"Program of the month: sfpow"},"content":{"rendered":"<p><a href=\"\/RSF\/sfpow.html\">sfpow<\/a> multiplies the input data by a gain function of the form<br \/>\n$$G(x_1,x_2,\\ldots,x_n)=x_1^{p_1}\\,x_2^{p_2} \\cdots x_n^{p_n}$$<br \/>\nThe powers $p_1,p_2,\\ldots,p_n$ are given by <strong>pow1=<\/strong>, <strong>pow2=<\/strong>, etc. parameters. <\/p>\n<p>For backward compatibility, <strong>sftpow tpow=<\/strong> is an alias for <strong>sfpow pow1=<\/strong>. <\/p>\n<p>The following example from <a href=\"\/RSF\/book\/geo391\/hw1\/tpow.html\">geo391\/hw1\/tpow<\/a> shows an application of <strong>sfpow pow1=2 <em>*to a shot gather. The gain of *<\/em>pow1=2<\/strong> for seismic data was <a href=\"http:\/\/sepwww.stanford.edu\/data\/media\/public\/sep\/\/prof\/iei\/dspr\/paper_html\/node6.html\">advocated by Jon Claerbout<\/a>. <\/p>\n<p><img decoding=\"async\" src=\"\/RSF\/book\/geo391\/hw1\/tpow\/Fig\/tpow.png\" alt=\"\" title=\"\" \/> <\/p>\n<p>To estimate an appropriate power gain from the data, you can try <a href=\"\/RSF\/sffpow.html\">sffpow<\/a>. <\/p>\n<h3 id=\"10previousprogramsofthemonth\">10 previous programs of the month<\/h3>\n<ul>\n<li><a href=\"\/blog\/2013\/02\/09\/program-of-the-month-sfpwd\/\">sfpwd<\/a><\/li>\n<li><a href=\"\/blog\/2013\/01\/08\/program-of-the-month-sfricker1\/\">sfricker1<\/a><\/li>\n<li><a href=\"\/blog\/2012\/12\/23\/program-of-the-month-sfhalfint\/\">sfhalfint<\/a><\/li>\n<li><a href=\"\/blog\/2012\/11\/03\/program-of-the-month-sfbandpass\/\">sfbandpass<\/a><\/li>\n<li><a href=\"\/blog\/2012\/10\/03\/program-of-the-month-sfkirmod\/\">sfkirmod<\/a><\/li>\n<li><a href=\"\/blog\/2012\/09\/03\/program-of-the-month-sfiwarp\/\">sfiwarp<\/a><\/li>\n<li><a href=\"\/blog\/2012\/08\/01\/program-of-the-month-sfpick\/\">sfpick<\/a><\/li>\n<li><a href=\"\/blog\/2012\/07\/02\/program-of-the-month-sffft3\/\">sffft3<\/a><\/li>\n<li><a href=\"\/blog\/2012\/06\/02\/program-of-the-month-sfdip\/\">sfdip<\/a><\/li>\n<li><a href=\"\/blog\/2012\/05\/01\/program-of-the-month-sfderiv\/\">sfderiv<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>sfpow multiplies the input data by a gain function of the form $$G(x_1,x_2,\\ldots,x_n)=x_1^{p_1}\\,x_2^{p_2} \\cdots x_n^{p_n}$$ The powers $p_1,p_2,\\ldots,p_n$ are given by pow1=, pow2=, etc. parameters. For backward compatibility, sftpow tpow= is an alias for sfpow pow1=. The following example from geo391\/hw1\/tpow shows an application of sfpow pow1=2 *to a shot gather. The gain of *pow1=2 [&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":"","activitypub_max_image_attachments":4,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":""},"categories":[3],"tags":[],"class_list":["post-321","post","type-post","status-publish","format-standard","hentry","category-programs"],"_links":{"self":[{"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/posts\/321","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=321"}],"version-history":[{"count":4,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/posts\/321\/revisions"}],"predecessor-version":[{"id":42017,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/posts\/321\/revisions\/42017"}],"wp:attachment":[{"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/media?parent=321"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/categories?post=321"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ahay.org\/blog\/wp-json\/wp\/v2\/tags?post=321"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}