pybsrnqc 0.1.33

Package to study BSRN data and their quality control

PyBsrnQC

A library for BSRN Quality Control (QC)

Repository github with the source code : https://github.com/LE2P/PyBsrnQC

Installation

Using pip

pip install pybsrnqc

Quick use

Put your solar data in a directory (dataset for example). Data is registered in CSV files, there is a value each minute.

The data has to have at least the following columns in the header :

timestamp	global2_avg	direct_avg	diffuse_avg	downward_avg	temperature
2019-08-01 00:00:00	145.1	665.300	69.340	365.65	25

Example :

Data under the form YYYYMM_brut.csv with a csv file per month gathered in a directory dataset.

- dataset/
  - 201906_brut.csv
  - 201907_brut.csv
  - 201908_brut.csv
  - ...

You can then study this data :

• Calculate the BSRN coefficient of a certain Quality Control chosen
• Create the flagged data file associated with your datas and the coefficients selected
• Visualize the datas

BSRN coefficient calculation

Use the coef_calculator module.

from pybsrnqc import coef_calculator as cc 

name_coef, coef = cc.compute('./dataset')

You can then load your coefficient to your configuration file. Thus, your automatic control will take into account the new specific coefficient calculated.

from pybsrnqc import config

config.load(name_coef, coef)

If your QC have a maximum and a minimum limit (QC5 for instance) you can use the following code :

from pybsrnqc import coef_calculator as cc 
from pybsrnqc import config

name_coef, coef, name_coef_min, coef_min = cc.compute('./dataset')
config.load(name_coef, coef, name_coef_min, coef_min)

Quality Control tool

Use the automaticQC module in order to generate the flagged data :

from pybsrnqc.automaticQC import generateQCFiles

generateQCFiles('./dataset/201908_brut.csv')

Be careful : when you generate your files, it is in the same directory than you brut data. Don't forget to move your generated files if you want to continue to study your brut data.

If you want to visualize the QC of your data and your data use :

• plotQCFiles

  from pybsrnqc.automaticQC import plotQCFiles
  
  plotQCFiles('./dataset/201908_brut.csv')
  

• plotBSRN from visualPlot

   from pybsrnqc.visualPlot import plotBSRN
  
   plotBSRN('./dataset/201908_brut.csv')
  

Visualization tools

You can use other functions of the pybsrnqc packages to plot and visualize the data.

• Access to data

  Inquire the path of your directory (you can select the time period over which you want to observe the data). If the period isn't specified all the files are opened.

  from pybsrnqc import open_data as od
  
  df = od.open_all('./dataset')
  

  If you want to specify the period, put your data under the form YYYYMM_brut.csv and inquire the period as[YYYYMM, YYYYMM].

   # Example to select data from June to December 2019
  
   df = od.open_all('./dataset',period=['201906','201912'])
  

• You can plot the data over the time period chosen with the current limits.

  import json 
  from pybsrnqc import plot_limits as pl
  from pybsrnqc import qc_functions as qcf
  
  # Get data conf from JSON file
  with importlib.resources.path("pybsrnqc", "qcrad_conf.json") as data_path:
  with open(data_path, 'r') as f:
      coefs = json.load(f)
  
  # Plot the limits for the QC chosen (here QC1)
  pl.limit_plot(df, qcf.QC1(), coefs)
  

• Plotting limits with differents coefficient values

  # Plot the limits for the QC chosen (here QC1)
  pl.multiplot_coef(df, qcf.QC1(), coefs)
  

• Plotting the 3D histogram of the data

  # Plot the histogram for the QC chosen (here QC1)
  pl.hist_data(df, qcf.QC1())
  

Density analysis

• Computation of the data density Compute the density of each elements over the dataset given

   # Calculation of the KDE for a dataset
   log_kernel = pl.kde_computing(df, qcf.QC1())
  

• Time series plotting Zoom on a certain period of time : plot on sza or time with density values.

  # Time series plotting and density
  pl.plot_series_kde(df, log_kernel, QC, begin, end)
  

• Coefficient indicators Plot the evolution of certain values according to he coefficient Return a dataframe containing the indicators values

  from pybsrnqc import coef_study as cs
   
  # Indicators plotting
  df_var = cs.coef_variation(df, log_kernel, qcf.QC1())
  

• Getting the coefficient This function give the best coefficient giving a density threshold defined as the outlier limit. Return the score dataframe and the best score with the linked coefficient.

  # Coefficient calculation
  df_score, score = cs.calc_coef(df, log_kernel, qcf.QC1(), threshold=-15)