python绘制地震散点图

Python  /  管理员 发布于 7年前   159

本项目是利用五年左右的世界地震数据，通过python的pandas库、matplotlib库、basemap库等进行数据可视化，绘制出地震散点图。主要代码如下所示

from __future__ import divisionimport pandas as pdfrom pandas import Series,DataFrameimport numpy as npfrom matplotlib.patches import Polygon chi_provinces = ['北京','天津','上海','重庆',     '河北','山西','辽宁','吉林',     '黑龙江','江苏','浙江','安徽',     '福建','江西','山东','河南',     '湖北','湖南','广东','海南',     '四川','贵州','云南','陕西',     '甘肃','青海','台湾','内蒙古',     '广西','西藏','宁夏','新疆',     '香港','澳门'] #list of chinese provinces  def is_in_china(str): if str[:2] in chi_provinces:  return True else:  return False def convert_data_2014(x): try:  return float(x.strip()) except ValueError:  return x except AttributeError:  return x def format_lat_lon(x): try:  return x/100 except(TypeError):  return np.nan df = pd.read_excel(r'C:/Users/GGWS/Desktop/shuju/201601-12.xls')df = df.append(pd.read_excel(r'C:/Users/GGWS/Desktop/shuju/201201-12.xls'),ignore_index = True)df = df.append(pd.read_excel(r'C:/Users/GGWS/Desktop/shuju/shuju.xls'),ignore_index = True)df = df.append(pd.read_excel(r'C:/Users/GGWS/Desktop/shuju/201501-12.xls'),ignore_index = True)df_2014 = pd.read_excel(r'C:/Users/GGWS/Desktop/shuju/201401-12.xls') #have to introduce statics of 2014 independently because the format and the type of data of specific column in this data set are different from othersdf['longitude'] = df['longitude'].apply(convert_data_2014)df['latitude'] = df['latitude'].apply(convert_data_2014) df_2014['longitude'] = df_2014['longitude'].apply(convert_data_2014)df_2014['latitude'] = df_2014['latitude'].apply(convert_data_2014)df = df.append(df_2014,ignore_index = True) df = df[['latitude','longitude','magnitude','referenced place','time']] #only save four columns as valuable statics df[['longitude','latitude']] = df[['longitude','latitude']].applymap(format_lat_lon) #use function "applymap" to convert the format of the longitude and latitude staticsdf = df.dropna(axis=0,how='any') #drop all rows that have any NaN valuesformat_magnitude = lambda x: float(str(x).strip('ML'))df['magnitude'] = df['magnitude'].apply(format_magnitude)#df = df[df['referenced place'].apply(is_in_china)] lon_mean = (df['longitude'].groupby(df['referenced place'])).mean()lat_mean = (df['latitude'].groupby(df['referenced place'])).mean()group_counts = (df['magnitude'].groupby(df['referenced place'])).count() after_agg_data = pd.concat([lon_mean,lat_mean,group_counts], axis = 1 )after_agg_data.rename(columns = {'magnitude':'counts'} , inplace = True) #aggregate after grouping the data after_sorted_data = after_agg_data.sort_values(by = 'counts',ascending = False)new_index = np.arange(len(after_sorted_data.index))after_sorted_data.index = new_indexpaint_data = after_sorted_data[after_sorted_data['counts']>=after_sorted_data['counts'][80]]  import matplotlib.pyplot as pltfrom mpl_toolkits.basemap import Basemap plt.figure(figsize=(16,8))m = Basemap()m.readshapefile(r'C:/Users/GGWS/Desktop/jb/gadm36_CHN_1', 'states', drawbounds=True)ax = plt.gca()'''for nshape,seg in enumerate (m.states): poly = Polygon(seg,facecolor = 'r') ax.add_patch(poly)'''m.drawcoastlines(linewidth=0.5)m.drawcountries(linewidth=0.5)m.shadedrelief()  for indexs in df.index:  lon2,lat2 = df.loc[indexs].values[1],df.loc[indexs].values[0]  x,y = m(lon2,lat2)  m.plot(x,y,'ro',markersize = 0.5)      #获取经度值'''for indexs in after_sorted_data.index[:80]: lon,lat = after_sorted_data.loc[indexs].values[0],after_sorted_data.loc[indexs].values[1] x,y = m(lon,lat) m.plot(x,y,'wo',markersize = 10*(after_sorted_data.loc[indexs].values[2]/after_sorted_data.loc[0].values[2]))'''plt.title("Worldwide Earthquake") plt.show()  #indexs-len(df.index)+80

效果如下

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