Artifacts from aps_linear

[ne...@nigs.upd.edu.ph]

Hi David,

First, thank you for your work, it is very much appreciated. I'm trying out TRAIN after doing the StaMPS processing. I initially used aps_linear, but it appears there are some artifacts with the result. I tried to follow the manual and tutorial, but I might be missing something. Attached is the output of v-dao. This is from ALOS 1, with 2 scenes combined. Not sure if those are relevant information though. Below are the parameters printed out from getparm_aps. I removed the full file paths for some of the variables.

Cheers,

Narod

                bperp_matfile: '.../INSAR_20090828/ps2.mat'

                    crop_flag: 'n'
                     dem_null: '-9999'
                      demfile: '.../DEM/SWLUZON/sw_luzon'
               drop_ifg_index: []
                era_data_type: 'ECMWF'
                 era_datapath: []
               gacos_datapath: []
                      heading: -12.1569
                  hgt_matfile: '.../INSAR_20090828/hgt2.mat'
               ifgday_matfile: '.../INSAR_20090828/ps2.mat'
                       lambda: 0.2361
                   ll_matfile: '.../INSAR_20090828/ps2.mat'
                   look_angle: '.../INSAR_20090828/la2.mat'
               meris_datapath: []
          meris_perc_coverage: 80
               merra_datapath: []
            modis_calibration: 0.9500
               modis_datapath: []
           modis_recalibrated: 'n'
                non_defo_flag: 'n'
                 phuw_matfile: '.../INSAR_20090828/phuw2.mat'
            powerlaw_DEM_corr: 'n'
           powerlaw_all_bands: 'y'
               powerlaw_alpha: 1.6000
                  powerlaw_h0: 10
                powerlaw_kept: 0
           powerlaw_n_patches: 50
       powerlaw_patch_overlap: 50
          powerlaw_plane_mode: 'y'
    powerlaw_ridge_constraint: 'n'
       powerlaw_spatial_bands: [16000 32000]
              powerlaw_xy_res: [30 30]
             region_lat_range: [12.9583 15.0417]
             region_lon_range: [119.9583 122.0417]
                   region_res: 0.0083
             save_folder_name: 'aps_estimation'
          small_baseline_flag: 'n'
                sounding_data: 'n'
                 sounding_dir: '.../INSAR_20090828/sounding_data'
            sounding_end_date: []
         sounding_error_promp: 'n'
                  sounding_h0: 0
       sounding_h_alpha_thres: 4
           sounding_ifg_dates: 'n'
              sounding_months: 1
         sounding_sensitivity: 'n'
          sounding_start_date: []
          sounding_time_stamp: [2x2 char]
    spectrometer_PIconversion: 6.2000
     spectrometer_scaleheight: 8340
             stamps_processed: 'y'
                 wrf_datapath: []

[David Bekaert]

I suspect that something might be wrong with the hgt information.

Perhaps plot the hgt and the unwrapped phase for an IFG and see if the APS correction for that IFG looks reasonable.

Cheers,

D.