As same as 図化, 変化点バッファ, 車線リンク or 端点, 出典整備 would be a technical term that has a specific meaning in the field or the software you are using, so the information is not enough yet to get the meaning correctly.
Anyway, judging from 出典整備/図化開始/終了位置は、…一つ手前/奥の端点を設定する, my wild guess is that 出典整備 is for reference points to indicate where the map is altered.