Tourism regionalization in the Yangtze River Delta based on accessibility

Regionalization has been one of the core issues in geographical research.Taking the Yangtze River Delta as an example,with accessibility spatial expression technology and systemic classification of point element and line element,we calculated service range of A-grade tourist districts,high-grade(4A and 5A) tourist districts,county-level towns and prefecture-level cities through accessibility.Based on this,we divided the Yangtze River Delta into five regions,27 sub-regions and 85 minor regions through service ranges with different time thresholds and deep analysis of tourist districts distribution pattern.Furthermore,we appraised tourism development potential of each minor region synthetically from an angle of tourism demand and supply elements.Based on development potential,we established the hierarchy of tourism service centers in the Yangtze Delta Delta.