Adding LAMDA filtering toolkit (#115)

* updates to plot_features.py

* add LAMDA filtering tools

* changed to functions

* pycodestyle issues

LAMDA/LAMDA_tools.py

@@ -0,0 +1,56 @@
+import numpy as np
+import pandas as pd
+
+
+def land_fraction(self, df):
+    """
+    Returns dataframe for only land data.
+    """
+    df = df[df['land_fraction'] > 0]
+
+    return df
+
+
+def water_fraction(self, df):
+    """
+    Returns dataframe for only water data.
+    """
+    df = df[df['water_fraction'] > 0]
+
+    return df
+
+
+def cloud_fraction(self, df):
+    """
+    Returns dataframe for only cloud data.
+    """
+    df = df[df['cloud_fraction'] > 0]
+
+    return df
+
+
+def vegetation_fraction(self, df):
+    """
+    Returns dataframe for only vegetation data.
+    """
+    df = df[df['vegetation_fraction'] > 0]
+
+    return df
+
+
+def ice_fraction(self, df):
+    """
+    Returns dataframe for only ice data.
+    """
+    df = df[df['ice_fraction'] > 0]
+
+    return df
+
+
+def snow_fraction(self, df):
+    """
+    Returns dataframe for only snow data.
+    """
+    df = df[df['snow_fraction'] > 0]
+
+    return df