Method for characterizing a product by means of topological spectral analysis

Method of characterization of a target product, said method comprising of the following steps:

• (1) formation of a spectral database comprising samples, their spectra and their measured characteristics,
• (2) spectral analysis of the target product and comparison of the spectrum obtained with the spectral data of the database,
• (3) identification of close neighbor points of the target product, and
• (4) calculation by topology of the characteristic of the target product as a function of the corresponding characteristics of the close neighbor points,
• wherein the calculation of step (4) is based on a weighting associated with an inverse of a distance between the target product and the close neighbor points,
• (5) determining, based upon the calculation, characteristic of the target product;
• and using the determined characteristic of the target product to determine the target product.