Sunburst with ordered nodes based on hierarchical clustering: a visual analyzing method for associated hierarchical pesticide residue data

"Twelfth Five Year Plan'' National Science and Technology Support Program [2012BAD29B01-2]; open funding project of State Key Laboratory of Virtual Reality Technology and Systems, Beihang University [BUAA-VR-14KF-04]; Funding Project for Innovation on Science, Technology; Graduate Education in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality [PXM2014_014213_000043]