2024-09-12 18:48:58 +08:00
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### 变磁化参数化极（DRTP）
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#### 简介
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drtp程序可计算变磁化参数（磁偏角与磁倾角）的化极磁异常，适用于大陆磁异常数据的化极处理。程序可计算或读入标准IGRF程序生成的主磁场参数，并计算相应的化极磁异常。程序适用于网格化的总场磁异常数据的处理，网格文件的格式为netCDF格式。
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#### 程序用法
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如下所示，drtp程序可通过命令行调用，参数为配置文件的名称（包含路径）。
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```cxx
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./drtp <config-file>
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```
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配置文件为普通文本文件，注释行以`#`号开始。文件中每一行包含一条选项配置，格式为：
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```shell
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<key> = <value>
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```
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##### 选项列表
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如下为程序可识别的选项键值与相应的选项格式：
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```shell
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# Directory to the netcdf file of the deltaT anomalies
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input-grid = <file>
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# Directory to the output netcdf file
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output-grid = <file>
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# Names of data attribute of the netcdf file. The default is x,y,z.
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grid-para = <x-axis>,<y-axis>,<data>
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# Directory to the executable of the geomag.exe program
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geomag-exe = <exe>
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# Parameters needed by the geomag.exe program
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geomag-para = <para>
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# Directory to the output file of the geomag.exe program
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geomag-output = <file>
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# Directory to the IGRF model file
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IGRF = <file>
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# Call the geomag.exe program to calculate the geomagnetic parameters
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call-geomag = yes|no
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# Use a set of mean geomagnetic parameters defined by the user. Use this option to run a non-differential RTP process.
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mean-geomag = <inc>/<dec>
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# Differential orders of the taylor series. Must be between 1 and 5. The default order is 2.
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taylor-order = <order>
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```
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不同计算流程所需的选项如下：
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1. 非变参数化极（普通化极）
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```shell
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input-grid mean-geomag output-grid(optional) grid-para(optional)
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```
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2. 变参数化极（无IGRF参数文件）
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```shell
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input-grid output-grid(optional) geomag-exe geomag-para geomag-output IGRF call-geomag(yes) taylor-order(optional) grid-para(optional)
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```
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3. 变参数化极（有IGRF参数文件）
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```shell
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input-grid output-grid(optional) geomag-output call-geomag(no) taylor-order(optional) grid-para(optional)
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```
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