What is peptide mapping?
Shimadzu explains peptide mapping as follows:


  Peptide mapping involves selectively cleaving the individual target [proteins] using an appropriate enzyme or chemical and analyzing the peptide fragments obtained using HPLC [high-performance liquid chromatography] or another suitable method. [... I]dentification of the peptide fragments separated by LC [...] [can be done] using amino acid composition analysis, N-terminal amino acid sequence analysis, or mass spectrometry.


As such, it does not provide a sequence of amino acids. Instead, you get a specific set of peptides of different sizes, dependent on the method used, that in turn can be used for protein fingerprinting.