檢視水准点的原始碼

[[File:水准点.jpg|缩略图|[https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E6%B0%B4%E5%87%86%E7%82%B9%20%E7%BC%96%E8%BE%91&step_word=&hs=0&pn=0&spn=0&di=15400&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=2538049060%2C4134438606&os=2351224087%2C3721395836&simid=26443286%2C846455981&adpicid=0&lpn=0&ln=1308&fr=&fmq=1620134388780_R&fm=&ic=undefined&s=undefined&hd=undefined&latest=undefined&copyright=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fnewoss.zhulong.com%2Ftfs%2Fpic%2Fv1%2Ftfs%2FT1f_J_B4bg1RCvBVdK.jpg%26refer%3Dhttp%3A%2F%2Fnewoss.zhulong.com%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Djpeg%3Fsec%3D1622726393%26t%3Dded63b52669f21238548eb12b2c52850&fromurl=ippr_z2C%24qAzdH3FAzdH3Fkkf_z%26e3Bzi7s5g2_z%26e3Bv54AzdH3F1jpwtsdalm8nbm_z%26e3Bip4s&gsm=1&rpstart=0&rpnum=0&islist=&querylist=&force=undefined 原图链接][https://bbs.zhulong.com/102030_group_200700/detail20961386/ 来自筑龙岩土工程论坛]]]
'''水准点'''（Benchmark，简称BM）是用水准测定高程的点。为了满足工程建设的需要，测绘部门已在全国各地测定了许多水准点。在水准测量之前应做好点的标志。水准点一般分为永久性和临时性两大类。国家水准点一般做成永久点。永久水准点一般由混凝土制成，深埋到冻土线下，标石的顶部埋有耐腐蚀的半球状金属标志。有时水准点也可设在稳定的墙角上。临时水准点可用大木桩打入地下，顶面钉一铁钉，也可利用地面突出的坚硬岩石。<ref>[http://www.chinanews.com/ny/2013/06-17/4934731.shtml  天津曾发过多少次大水 百年老屋记录“水准点” ]中国新闻网</ref>