python地震数据可视化详解
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。
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