Additional file 1 of A method for correcting InSAR interferogram errors using GNSS data and the K-means algorithm
Creators: name: Yan, Huineng
name: Dai, Wujiao
name: Xu, Wenbin
name: Shi, Qiang
name: Sun, Kai
name: Lu, Zhigang
name: Wang, Rui
Publisher: name: figshare
Year: 2024
Subjects: subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Plant Biology
subject: FOS: Biological sciences

description: Additional file1: Figure S1. Example of t-distribution test for processing GNSS data. The first subfigure represents the fitting of GNSS data using the initial deformation eigenfunction, the second subfigure represents the fitting of GNSS data using the t-distribution test for the updated deformation eigenfunction, and the third subfigure represents the difference between the two. Figure S2. Processing results of deformation time series data of four GNSS sites. The blue dots indicate the deformation time series before error repair, and the red dots indicate the deformation time series after error repair. Figure S3. Comparison of the deformation rate values calculated in this paper (blue line) for the GNSS sites with the results calculated by the MIDAS algorithm (red line). Figure S4. Interferogram of 2020-05-10 to 2020-06-03 correction amount generation process (3 clusters). The three subfigures (a–c) in the first row represent the plane fitting results corresponding to the three clustering results of the GNSS data, where the red triangles represent the locations of the cluster centers, the black stars represent the locations of the GNSS stations, and the colors correspond to the values of the deformation corrections of the plane fitting. The second row of subfigures from left to right represent (d–g): the spatial clustering results of the InSAR interferograms (red triangles represent the locations of the cluster centers, and different colors represent different clusters), the deformation correction values generated according to the correspondence between the GNSS and InSAR cluster centers, the deformation correction values after Gaussian filtering, and the differences due to Gaussian filtering (the red ellipses mark the regions with significant differences). Figure S5 Error correction results for four interferograms with different number of clusters (one to four clusters) for 137A. The subfigures in each row from left to right represent the original interferogram, the amount of interferogram correction, and the corrected interferogram, respectively. Warm colors (i.e., positive values) indicate surface displacement toward the satellite, and cold colors (i.e., negative values) indicate motion away from the satellite. Circles represent locations of GNSS sites, and filled colors represent the deformation values. Figure S6. First order deformation trend term of 137A. Warm colors (i.e., positive values) indicate surface displacement toward the satellite, and cold colors (i.e., negative values) indicate motion away from the satellite. Figure S7. Numerical distribution of STD values and average absolute values, corresponding to the remaining signals after removing the first order deformation trend term from the corrected interferogram of 137A. Figure S8. Histogram of deformation RMSE between GNSS sites and 137A InSAR time series. Figure S9. Interferogram of 2019-03-23 to 2019-04-28 correction amount generation process (2 clusters). The three subfigures (a and b) in the first row represent the plane fitting results corresponding to the three clustering results of the GNSS data, where the red triangles represent the locations of the cluster centers, the black stars represent the locations of the GNSS stations, and the colors correspond to the values of the deformation corrections of the plane fitting. The second row of subfigures from left to right represent (c–f): the spatial clustering results of the InSAR interferograms (red triangles represent the locations of the cluster centers, and different colors represent different clusters), the deformation correction values generated according to the correspondence between the GNSS and InSAR cluster centers, the deformation correction values after Gaussian filtering, and the differences due to Gaussian filtering (the red ellipses mark the regions with significant differences). Figure S10. Error correction results for four interferograms with different number of clusters (one to four clusters) for 144D. The subfigures in each row from left to right represent the original interferogram, the amount of interferogram correction, and the corrected interferogram, respectively. Warm colors (i.e., positive values) indicate surface displacement toward the satellite, and cold colors (i.e., negative values) indicate motion away from the satellite. Circles represent locations of GNSS sites, and filled colors represent the deformation values. Figure S11. First order deformation trend term of 144D. Warm colors (i.e., positive values) indicate surface displacement toward the satellite, and cold colors (i.e., negative values) indicate motion away from the satellite. Figure S12. Numerical distribution of STD values and average absolute values, corresponding to the remaining signals after removing the first order deformation trend term from the corrected interferogram of 144D. Figure S13. Histogram of deformation RMSE between GNSS sites and 144D InSAR time series. Table S1. Statistics of t-distribution test for each parameter. Table S2. Number, name and latitude/longitude coordinates of the GNSS modeling sites used in 137A. Table S3. Number, name and latitude/longitude coordinates of the GNSS modeling sites used in 144D.