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python地震数据可视化详解

更新时间:2020-07-07 02:36:01 作者:startmvc
本文实例为大家分享了python地震数据可视化的具体代码,供大家参考,具体内容如下参考源

本文实例为大家分享了python地震数据可视化的具体代码,供大家参考,具体内容如下

参考源码:seisplot

准备工作:

在windows10下安装python3.7,下载参考源码到本地。

1. demo绘图测试

demo绘图指令

cmd> python seisplot.py --demo

问题1)缺少依赖包


 File "D:/Desktop/python可视化/seisplot/seisplot.py", line 16, in <module>
 import yaml
ModuleNotFoundError: No module named 'yaml'
 
>pip3 install yaml
 Could not find a version that satisfies the requirement yaml (from versions: )
No matching distribution found for yaml

查看environment.yml:


channels:
- defaults
- conda-forge
dependencies:
- matplotlib
- numpy
- obspy
- pillow
- pyyaml

安装相关依赖包,如 obspy pillow pyyaml 

cmd> pip3 install obspy

出现proxy error, 添加选项 --proxy server:port

安装ok

问题2)配置文件的编码异常


D:\Desktop\python可视化\seisplot>python seisplot.py --demo
[91m
 Welcome to
 ┌─┐┌─┐┬┌─┐┌─┐┬ ┌─┐┌┬┐
 └─┐├┤ │└─┐├─┘│ │ │ │
 └─┘└─┘┴└─┘┴ ┴─┘└─┘ ┴
 Good luck[0m
Traceback (most recent call last):
 File "seisplot.py", line 421, in <module>
 cfg = yaml.load(f)
 File "D:\ProgramFiles\Python36\lib\site-packages\yaml\__init__.py", line 70, in load
 loader = Loader(stream)
 File "D:\ProgramFiles\Python36\lib\site-packages\yaml\loader.py", line 34, in __init__
 Reader.__init__(self, stream)
 File "D:\ProgramFiles\Python36\lib\site-packages\yaml\reader.py", line 85, in __init__
 self.determine_encoding()
 File "D:\ProgramFiles\Python36\lib\site-packages\yaml\reader.py", line 124, in determine_encoding
 self.update_raw()
 File "D:\ProgramFiles\Python36\lib\site-packages\yaml\reader.py", line 178, in update_raw
 data = self.stream.read(size)
UnicodeDecodeError: 'gbk' codec can't decode byte 0x99 in position 2003: illegal multibyte sequence

分析源码中参数传递情况:


def load(stream, Loader=Loader):
 """
 Parse the first YAML document in a stream
 and produce the corresponding Python object.
 """
 print(stream) ## debug by huanying03
 loader = Loader(stream)
 try:
 return loader.get_single_data()
 finally:
 loader.dispose()

打印结果如下:


<_io.TextIOWrapper name='config.yml' mode='r' encoding='cp936'>

编码不对?

65001  :UTF-8代码页

936 :默认的GBK

437 :是美国英语

仔细检查发现config.yml中有异常字符,更正config.yml中错误字符:ok

问题3)python调试打印语句

print ("value=%d"%value)

demo数据绘图结果

如下:

2. 本地数据绘图测试

应用指令

cmd > python seisplot.py data/my.sgy

问题1)数据道的采样值异常


filename data2/t10.sgy
seismic.py:104:dt=4000
seismic.py:104:ns=512
seismic.py:144:header=b'C 1 CLIENT'
n_traces 500
n_samples 512
dt 0.004
t_start 0
t_end 2.044
max_val inf
min_val -inf
clip_val 180462501764003194804057887685476352
Read data in 0.4 s
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
PLOTTING
plot width 17.00 in
plot height 11.00 in
Traceback (most recent call last):
 File "seisplot.py", line 442, in <module>
 main(t, cfg)
 File "seisplot.py", line 214, in main
 cfg)
 File "D:\Desktop\python可视化\seisplot\plotter.py", line 123, in plot_histogram
 y, x, _ = ax.hist(np.ravel(data), bins=int(100.0 / (clip_val / largest)),
OverflowError: cannot convert float infinity to integer

解决办法:将数据做归一化处理

问题2)数据文件的卷头异常


filename data2/marmousi_vel.segy.hdrs.sgy.cdp.sgy
seismic.py:104:dt=10000
seismic.py:104:ns=350
seismic.py:144:header=b'\xc3@\xf1@\xc3\xd3\xc9\xc5\xd5\xe3'
Traceback (most recent call last):
 File "seisplot.py", line 442, in <module>
 main(t, cfg)
 File "seisplot.py", line 40, in main
 s = Seismic.from_segy(target, params={'ndim': cfg['ndim']})
 File "D:\Desktop\python可视化\seisplot\seismic.py", line 164, in from_segy
 return cls.from_obspy(stream, params=params)
 File "D:\Desktop\python可视化\seisplot\seismic.py", line 147, in from_obspy
 x =np.array(list(stream.textual_file_header.decode()))
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc3 in position 0: invalid continuation byte

解决办法:重写3200字节的segy卷头

marmousi相关数据绘图

速度模型绘图结果如下:

marmousi模型正演的炮集数据绘图结果如下:

测试备忘

1

cygwin执行指令,可以看到反馈信息为彩色,分析信息很方便。

相比之下,cmd终端执行指令后的反馈信息可读性较差。

2

本地数据出现异常后,通过cwp中的segyread, sushw, sugain, segywrite等程序进行修改,满足绘图程序要求。

1)3200字节的卷头必须规范

2)道头字中的cdpt取值必须规范(xline)

3)道采样值最好归一化处理。

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

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