python地震数据可视化详解

2019-11-25 12:43:27

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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 yamlModuleNotFoundError: 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-forgedependencies:- 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[0mTraceback (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.sgyseismic.py:104:dt=4000seismic.py:104:ns=512seismic.py:144:header=b'C 1 CLIENT'n_traces 500n_samples 512dt   0.004t_start 0t_end  2.044max_val infmin_val -infclip_val 180462501764003194804057887685476352Read data in 0.4 s ++++++++++++++++++++++++++++++++++++++++++++++++++++++++PLOTTINGplot width 17.00 inplot height 11.00 inTraceback (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.sgyseismic.py:104:dt=10000seismic.py:104:ns=350seismic.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：