Patent ID: 7840375

Claim:
A method of generating a library from a reference substrate for use in processing a product substrate other than the reference substrate, the method comprising: measuring substrate characteristics at a plurality of well-defined points of a reference substrate with a first metrology system; measuring spectra at a plurality of measurement points of the reference substrate with a second monitoring system other than the first metrology system to generate a plurality of measured spectra, the plurality of measurement points including points other than the well-defined points and the plurality of well-defined points including points other than the measurement points, there being more measurement points than well-defined points; for each measured spectrum of the plurality of measured spectra, determining in a processor at least one well-defined point from the plurality of well-defined points that is proximate to a measurement point of the measured spectrum; after measuring the substrate characteristics and measuring the spectra, for each measured spectrum of the plurality of measured spectra, in a processor, calculating a substrate characteristic based on a measured substrate characteristics of the proximate well-defined point; and for each measured spectrum of the plurality of measured spectra, storing in a memory the measured spectrum, the calculated substrate characteristic and an association of the calculated substrate characteristic with the measured spectrum to generate the library for use in processing a product substrate other than the reference substrate.