Bernese提供了生成该大气负荷文件的工具,位于:
Menu >Service >Coordinate tools >Extract atmospheric tidal loading coefficients
需要注意的是,输入文件包括2个:
第一个:s1_s2_def_ce.dat,已经在 "${X}/GEN" 目录中了。
第二个:站信息表,也就是需要指明那些站计算大气负荷,当然这个程序会根据站名自动去寻找该站的经纬度。
下图是S1和S2大气潮汐的径向表面位移
https://geophy.uni.lu/atmosphere/tide-loading-calculator/
以下翻译自官方文档:
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Bernese GNSS软件,版本5.2,最新版本:2012年10月3日
安装S1 / S2大气潮汐荷载网格文件
S1 / S2位移网格的来源
在全球地球物理流体中心(GGFC)的网站上
http://geophy.uni.lu/ggfc-atmosphere/tide-loading-calculator.html
大气潮汐负荷位移网格
-CE:固体地球的中心
(在这种情况下,也可以用作“ CF:图形中心”)
-CM:重心
提供。
根据Ray和Ponte模型[2003]给出了更正
加入IERS 2010大会。
文件“s1_s2_def_ce.dat”与Bernese GNSS一起分发
“${X}/GEN”目录中的软件。
重要的提示:
如果您还打算针对大气非潮汐载荷进行校正,则可以
使用一致的潮汐荷载贡献必不可少。格式
预期网格文件的内容在本文档的最后一部分中进行了描述
文件。
置换网格的实现
S1/S2负载系数存储在伯尔尼战役。
使用以下程序GRDS1S2
菜单>服务>坐标工具>提取大气潮汐负荷系数
为给定的一组站点坐标生成“.ATL”文件
伯尔尼格式的坐标文件。
程序GRDS1S2.f是程序grdintrp.f的派生自
上述网站。它已适应环境
的GNSS GNSS软件可以按预期的方式读写文件-
垫子(由卢森堡大学的Tonie van Dam提供)。
使用替代的大气潮汐网格
在文件的开头,可以给出数据的简短描述
复制到生成的伯尔尼语格式的“ .ATL”文件中。这些
该行的开头用“ $$”表示注释。
数据部分由14列带实数的列组成(无列
宽度是预定义的,但必须至少用一个空格分隔
字符):
-1/2:经度,纬度
-3/4:径向上S1的余弦和正弦项
-5/6:径向上S2的余弦和正弦项
-7/8:北向S1的余弦和正弦项
-9/10:北方向S2的余弦和正弦项
-11/12:S1向东的余弦和正弦项
-13/14:S2向东的余弦和正弦项
如果您引入的分辨率高于1度的网格
必须增加MXLON和MXLAT定义的数组
$FG/GRDS1S2.f(或%FG:\GRDS1S2.f)。
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英文文档:
Bernese GNSS Software, Version 5.2 Last mod.: 03-Oct-2012
Installation of the S1/S2 atmospheric tidal loading grid files
Source of the S1/S2 displacement grids
On the web site of the Global Geophysical Fluid Center (GGFC)
http://geophy.uni.lu/ggfc-atmosphere/tide-loading-calculator.html
the atmospheric tidal loading displacement grids refering either to
- CE: center of the solid Earth
(can be used in this context also as "CF: center of figure") - CM: center of the mass
are provided.
The corrections are given for the Ray and Ponte model [2003] according
to the IERS 2010 conventions.
The file "s1_s2_def_ce.dat" is distributed with the Bernese GNSS
Software in the "${X}/GEN" directory.
IMPORTANT NOTE:
If you plan to correct also for atmospheric non-tidal loading, it is
essential to use a consistent tidal loading contribution. The format
of the expected grid file is described in the last section of this
file.
Implementation of the displacement grids
S1/S2 loading coefficients are stored in the STA directory of a
Bernese campaign.
Use the program GRDS1S2 from
Menu >Service >Coordinate tools >Extract atmospheric tidal loading
coefficients
to generate the ".ATL" file for a set of station coordinates given in
a Bernese formatted coordinate file.
The program GRDS1S2.f is a derivative of the program grdintrp.f from
the above mentioned web-site. It has been adapted for the environment
of Bernese GNSS Software to read and write files in the expected for-
mats (courtesy to Tonie van Dam, University of Luxembourg).
Using alternative atmospheric tidal loading grids
At beginning of the file a short description of the data may be given
that is copied into the resulting Bernese formatted ".ATL" file. These
comments are indicated by "$$ " at the beginning of the line.
The data part consists of 14 columns with real numbers (no column
width is predefined but they must be seperated by at least one blank
character):
- 1/ 2: longitude, latitude
- 3/ 4: cosine and sine terms for S1 in the radial direction
- 5/ 6: cosine and sine terms for S2 in the radial direction
- 7/ 8: cosine and sine terms for S1 in the north direction
- 9/10: cosine and sine terms for S2 in the north direction
- 11/12: cosine and sine terms for S1 in the east direction
- 13/14: cosine and sine terms for S2 in the east direction
If you introduce a grid with a higher resolution than 1-degree you
have to increase the arrays defined by MXLON and MXLAT in
$FG/GRDS1S2.f (or %FG:\GRDS1S2.f).
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