Ground Surface Freezing and Thawing Index Distribution in the Qinghai-Tibet Engineering Corridor and Factors Analysis Based on GeoDetector Technique

The land surface temperature obtained from remote sensing was widely used in the simulation of permafrost mapping instead air with rapid development technology. freezing and thawing index (LFI LTI), which is commonly regarded as ground (GFI GTI), can produce certain errors distribution on Qinghai–Tibet Plateau. This paper improved accuracy thermal condition soil Engineering Corridor (QTEC) by calculating LFI (or LTI) N-factors. environmental factors affecting spatial GFI GTI were detected GeoDetector model. Finally, multiple linear relationships between GTI) established. results 25 monitoring sites QTEC show that Nf (ratio to LFI) 1.088, Nt 0.554. explanatory power interaction elevation latitude for 79.3% 85.6%, respectively. regression model six variables established has good accuracy. study provide relatively accurate upper boundary conditions region.