Ling inside the middle and low latitudes must be further investigated.Author Contributions: Information curation, H.L.; formal analysis, Y.M.; investigation, G.X.; methodology, Y.M.; software, Z.L.; validation, H.L.; writing–original draft, Y.M.; writing–review and editing, Z.L. All authors have study and agreed for the published version with the manuscript. Funding: The project was financially supported by the Guangdong Standard and Applied Fundamental Investigation Foundation (Nos. 2021A1515012600) and the Shenzhen Science and Technologies Program (Nos. KQTD20180410161218820). Data Availability Statement: ECMWF reanalysis information can be obtained in the following site: https://apps.ecmwf.int/datasets/ (accessed on 29 April 2021). The Exendin-4 GPCR/G Protein meteorological data of sounding stations might be downloaded in the following link: ftp://ftp.ncdc.noaa.gov/pub/data/igra/ (accessed on 29 April 2021). The IGS item data files could be downloaded in the following web-site: ftp://geodesy.noaa.gov/ (accessed on 29 April 2021). Acknowledgments: The authors would like to thank the ECMWF and Integrated trans-Ned 19 Autophagy international Radiosonde Archive (IGRA) for providing the meteorological data as well as the IGS for delivering the tropospheric delay items of IGS stations. Conflicts of Interest: The authors declare no conflict of interest.Appendix A For the reader to be able to replicate the models are described, the data utilized in every stage plus the course of action of building the model are additional described, as shown in Figure A1. The modeling course of action in detail is as follows:Remote Sens. 2021, 13,16 ofFirst, determined by ERA-5 data from 2015 to 2019, the ZTD value is solved by Equation (1). Contemplating the influence of altitude on tropospheric delay, the tropospheric delay grid data is uniformly corrected for the grid information determined by imply sea level by Equation (5), including ZTD0 along with the corresponding altitude correction coefficient . Then, based on the global grid information (ZTD0 and ), the international tropospheric spherical harmonic coefficient set (SH_set) is established through the spherical harmonic function (Equation (6)). Final, we decompose the SH_set by the EOF process (Equations (8) and (9)) to get the basis vectors (U) and corresponding coefficients (Ai (h)). The EGtrop model is established by time fitting (Equation (12)) the EOF coefficients (Ai (h)). The reconstruction with the SH coefficients could be realized by utilizing Equation (7). Only by giving doy and Hod, the user can get tropospheric SH coefficients. Then, the worldwide tropospheric delay based on the imply sea level can be obtained by using the SH function and coefficients. The global altitude correction coefficient is obtained by the identical technique. Ultimately, the ZTD at the specified position is obtained by Equation (five).Figure A1. Flowchart of EGtrop model building.Remote Sens. 2021, 13,17 of
remote sensingReviewHigh-Precision 3D Reconstruction for Small-to-Medium-Sized Objects Using Line-Structured Light Scanning: A ReviewBin Cui , Wei Tao and Hui Zhao Division of Instrument Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; [email protected] (B.C.); [email protected] (W.T.) Correspondence: [email protected]; Tel.: +86-021-3420-Abstract: Three-dimensional reconstruction technology has demonstrated broad application possible within the industrial, building, health-related, forestry, agricultural, and pastural sectors in the last handful of years. High-quality digital point cloud facts exists to help researchers to know objects and.