The SASM/GNC/SRC romanization of Standard Tibetan, commonly known as Tibetan pinyin or ZWPY, is the official transcription system for the Tibetan language in China. It is based on the pronunciation used by China National Radio's Tibetan Radio, which is based on the Lhasa dialect. It has been used within China and international cartographic products as an alternative to the Wylie transliteration for writing Tibetan in the Latin script since 1982.