{"id":692,"date":"2024-07-04T16:12:19","date_gmt":"2024-07-04T10:42:19","guid":{"rendered":"https:\/\/study.madeeasy.in\/?p=692"},"modified":"2025-07-16T14:55:32","modified_gmt":"2025-07-16T09:25:32","slug":"level-field-book","status":"publish","type":"post","link":"https:\/\/www.madeeasy.in\/study\/ce\/surveying\/level-field-book","title":{"rendered":"LEVEL FIELD BOOK"},"content":{"rendered":"<ul>\r\n<li style=\"text-align: justify;\">It is the book used for entering the staff readings and reduced levels of various points.<\/li>\r\n<li style=\"text-align: justify;\">For computation of reduced levels of various points, two methods are used :<br \/>(a) Height of instrument \/ height of collimation method.<br \/>(b) Rise and fall method<\/li>\r\n<\/ul>\r\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_1 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.madeeasy.in\/study\/ce\/surveying\/level-field-book\/#Height-of-Instrument-Method-Height-of-Collimation-Method\" >Height of Instrument Method (Height of Collimation Method)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.madeeasy.in\/study\/ce\/surveying\/level-field-book\/#Rise-and-Fall-Method\" >Rise and Fall Method<\/a><\/li><\/ul><\/nav><\/div>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Height-of-Instrument-Method-Height-of-Collimation-Method\"><\/span>Height of Instrument Method (Height of Collimation Method)<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<ul style=\"text-align: justify;\">\r\n<li>The height of collimation is determined by adding the staff reading, which must be a backsight to the known reduced level of the point on which the staff stands.<\/li>\r\n<\/ul>\r\n<table class=\"table table-striped table-bordered table-condensed\" style=\"margin: 0 auto; width: 99%;\">\r\n<tbody>\r\n<tr>\r\n<th colspan=\"7\" width=\"372\">HI Method\/ Height of collimation method<\/th>\r\n<\/tr>\r\n<tr>\r\n<th width=\"64\">Station (1)<\/th>\r\n<th style=\"text-align: center;\" width=\"49\">BS (2)<\/th>\r\n<th style=\"text-align: center;\" width=\"49\">IS (3)<\/th>\r\n<th style=\"text-align: center;\" width=\"50\">FS (4)<\/th>\r\n<th style=\"text-align: center;\" width=\"49\">HI (5)<\/th>\r\n<th style=\"text-align: center;\" width=\"49\">RL (6)<\/th>\r\n<th width=\"61\">Remarks (7)<\/th>\r\n<\/tr>\r\n<tr>\r\n<td width=\"64\">\r\n<p style=\"text-align: center;\">A<\/p>\r\n<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">1.350<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">\u00a0<\/td>\r\n<td style=\"text-align: center;\" width=\"50\">\u00a0<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">101.350<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">100<\/td>\r\n<td style=\"text-align: center;\" width=\"61\">BM<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"text-align: center;\" width=\"64\">B<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">\u00a0<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">\u00a0<\/td>\r\n<td style=\"text-align: center;\" width=\"50\">2.150<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">101.350<\/td>\r\n<td width=\"49\">\r\n<p style=\"text-align: center;\">99.2<\/p>\r\n<\/td>\r\n<td width=\"61\">\u00a0<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<ul style=\"text-align: justify;\">\r\n<li>The first reading is always back sight.<\/li>\r\n<li>The last reading is always fore sight.<\/li>\r\n<li>Station at which both BS and FS readings are taken implies that it a change point i.e. instrument is shifted after taking the BS.<\/li>\r\n<li><strong>Arithmetic check :<\/strong> After computation of all the levels, the following arithmetic check is applied :<\/li>\r\n<\/ul>\r\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-414 aligncenter\" src=\"https:\/\/study.madeeasy.in\/wp-content\/uploads\/2024\/07\/arithmetic-check.jpg\" alt=\"Arithmetic Check\" width=\"466\" height=\"72\" \/><\/p>\r\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Rise-and-Fall-Method\"><\/span>Rise and Fall Method<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<table class=\"table table-striped table-bordered table-condensed\" style=\"margin: 0 auto; width: 99%;\">\r\n<tbody>\r\n<tr>\r\n<th colspan=\"8\" width=\"434\">Rise and Fall Method<\/th>\r\n<\/tr>\r\n<tr>\r\n<th width=\"64\">Station (1)<\/th>\r\n<th style=\"text-align: center;\" width=\"49\">BS (2)<\/th>\r\n<th style=\"text-align: center;\" width=\"49\">IS (3)<\/th>\r\n<th style=\"text-align: center;\" width=\"50\">FS (4)<\/th>\r\n<th style=\"text-align: center;\" width=\"49\">Rise (5)<\/th>\r\n<th style=\"text-align: center;\" width=\"50\">Fall (6)<\/th>\r\n<th style=\"text-align: center;\" width=\"61\">RL (7)<\/th>\r\n<th width=\"61\">Remarks (8)<\/th>\r\n<\/tr>\r\n<tr>\r\n<td width=\"64\">\r\n<p style=\"text-align: center;\">A<\/p>\r\n<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">1.350<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">\u00a0<\/td>\r\n<td style=\"text-align: center;\" width=\"50\">\u00a0<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">\u00a0<\/td>\r\n<td style=\"text-align: center;\" width=\"50\">\u00a0<\/td>\r\n<td style=\"text-align: center;\" width=\"61\">100<\/td>\r\n<td style=\"text-align: center;\" width=\"61\">BM<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"text-align: center;\" width=\"64\">\r\n<p style=\"text-align: center;\">B<\/p>\r\n<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">\u00a0<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">\u00a0<\/td>\r\n<td style=\"text-align: center;\" width=\"50\">2.150<\/td>\r\n<td style=\"text-align: center;\" width=\"49\">\u00a0<\/td>\r\n<td style=\"text-align: center;\" width=\"50\">0.8<\/td>\r\n<td style=\"text-align: center;\" width=\"61\">99.2<\/td>\r\n<td width=\"61\">\r\n<p style=\"text-align: center;\">\u00a0<\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<p style=\"text-align: justify;\"><strong>\u00a0<\/strong><\/p>\r\n<ul style=\"text-align: justify;\">\r\n<li>The first four and last two columns are exactly same as HI method.<\/li>\r\n<li>Here instead of column for HI, two columns of rise and fall are there.<\/li>\r\n<li>Here rise or fall of each station is determined w.r.t. previous station.<\/li>\r\n<li><strong>Arithmetic check :<\/strong> After computation of all the levels, the following arithmetic check is applied :<\/li>\r\n<\/ul>\r\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-416 aligncenter\" src=\"https:\/\/study.madeeasy.in\/wp-content\/uploads\/2024\/07\/formula.jpg\" alt=\"Formula\" width=\"303\" height=\"34\" \/><\/p>\r\n<p style=\"text-align: justify;\"><strong>Note:<\/strong><\/p>\r\n<p style=\"text-align: justify;\"><strong>Use of Inverted Staff<\/strong><\/p>\r\n<p style=\"text-align: justify;\">When the point, whose elevation is to be found, is much above the line of collimation (e.g. projection from the face of a building, underside of beams, girder and arches etc.), the staff is placed inverted with its zero end tou<img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-417 alignright\" src=\"https:\/\/study.madeeasy.in\/wp-content\/uploads\/2024\/07\/use-of-inverted-staff.png\" alt=\"Use of Inverted Staff\" width=\"198\" height=\"184\" \/>ching the point.<\/p>\r\n<p style=\"text-align: justify;\">The inverted staff reading is booked in the relevant column of the level book with a negative sign such that when reducing this reading from the height of collimation of the level we get,<\/p>\r\n<p style=\"text-align: justify;\">R.L of soffit = 67.3 \u2013 [\u20133.25] = 70.55 m<\/p>\r\n\r\n<p style=\"text-align: center;\"><a class=\"btn btn-danger\" role=\"button\" href=\"https:\/\/study.madeeasy.in\/ce\/surveying\/reciprocal-levelling\/\" target=\"_blank\" rel=\"noopener\">&lt;&lt; Previous<\/a> | <a class=\"btn btn-success\" role=\"button\" href=\"https:\/\/study.madeeasy.in\/ce\/surveying\/types-of-errors\/\" target=\"_blank\" rel=\"noopener\"> Next &gt;&gt;<\/a> <br \/><strong> Must Read: <\/strong> <a href=\"https:\/\/study.madeeasy.in\/subjects\/what-is-surveying\/\" target=\"_blank\" rel=\"noopener\"><strong>What is Surveying?<\/strong><\/a><\/p>\r\n<p>&nbsp;<\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>It is the book used for entering the staff readings and reduced levels of various points. For computation of reduced<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[203,2],"tags":[232,233,234],"class_list":["post-692","post","type-post","status-publish","format-standard","hentry","category-surveying","category-ce","tag-height-of-instrument-method","tag-rise-and-fall-method","tag-use-of-inverted-staff"],"_links":{"self":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts\/692","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/comments?post=692"}],"version-history":[{"count":0,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts\/692\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/media?parent=692"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/categories?post=692"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/tags?post=692"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}