The SASM/GNC/SRC romanization of Tibetan, commonly known as Tibetan pinyin, is the official transcription system for the Tibetan language in the People's Republic of China for personal name and place names. It is based on the Lhasa dialect of Standard Tibetan and reflects the pronunciation very accurately, except that it doesn't mark tone. It is used within China as an alternative to the Wylie transliteration for writing Tibetan in the Latin script; for use within academic circles, Wylie transliteration is more commonly used.
Read more about Tibetan Pinyin: Single Syllable Orthography, Examples