We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
A Case Study of the 3D Water Vapor Tomography Model Based on a Fast Voxel Traversal Algorithm for Ray Tracing.
- Authors
Hu, Heng; Liu, Min; Zhong, Jiqin; Deng, Xin; Cao, Yunchang; Fang, Peng
- Abstract
A fast voxel traversal algorithm for ray tracing was applied to build a 4 × 4 × 20 tomography model using the observation data of 11 ground-based Global Navigation Satellite System (GNSS) meteorology (GNSS/MET) stations in Hebei Province, China. The precipitation water vapor (PWV) observed at 05 a.m. (Universal Time Coordinated: UTC) on 10 December 2019, was used to reconstruct three-dimensional (3D) water vapor density fields over the test area. The tomographic results (GNSS_T) show that the water vapor density above this area is mainly below 25 g/m3 and is concentrated between the first to the fourth layers. The vertical distribution conforms to the exponential characteristics, while the horizontal distribution shows a decreasing trend from southwest to northeast. In addition, the results of the 0.25° grid dataset generated by the Global Forecast System (GFS) of the National Center for Environmental Forecasting (NCEP) (GFS_L) were interpolated to the height of the tomographic grid, which is in good agreement with the tomographic results. GFS_L is larger than GNSS_T on the first floor at the surface, with an average deviation of 0.19 g/m3. In contrast, GFS_L from the second floor to the top of the model is smaller than GNSS_T, with the average deviations distributed between −0.08 and −0.15 g/m3.
- Subjects
HEBEI Sheng (China); CHINA; RAY tracing algorithms; WATER vapor; GLOBAL Positioning System; VAPOR density; TOMOGRAPHY
- Publication
Remote Sensing, 2021, Vol 13, Issue 12, p2422
- ISSN
2072-4292
- Publication type
Article
- DOI
10.3390/rs13122422