iono_split_spectrum: hardwire dset while inverting for iono TS (#1239)

+ iono_split_spectrum:
   - hardwire dataset name to "unwrapPhase" while inverting for iono TS
   - remove the template file input, so it can ignore the template inputs, such as the "unwrapPhase_bridging" if one turns on the PU error correction.

+ defaults.smallbaselineApp.cfg: update correct_ionosphere reference, to be consistent with iono_split_spectrum.py help message.

src/mintpy/defaults/smallbaselineApp.cfg

@@ -206,7 +206,10 @@ mintpy.solidEarthTides = auto #[yes / no], auto for no
 
 ########## 7. correct_ionosphere (optional but recommended)
 ## correct ionospheric delay [need split spectrum results from ISCE-2 stack processors]
-## reference: Fattahi et al. (2017, IEEE-TGRS); Liang et al. (2017 IEEE-TGRS; 2018 IEEE-TGRS)
+## reference:
+##   ISCE-2 topsApp/topsStack: Liang et al. (2019, IEEE-TGRS)
+##   ISCE-2 stripmapApp/stripmapStack: Fattahi et al. (2017, IEEE-TGRS)
+##   ISCE-2 alos2App/alosStack: Liang et al. (2018, IEEE-TGRS)
 mintpy.ionosphericDelay.method        = auto  #[split_spectrum / no], auto for no
 mintpy.ionosphericDelay.excludeDate   = auto  #[20080520,20090817 / no], auto for no
 mintpy.ionosphericDelay.excludeDate12 = auto  #[20080520_20090817 / no], auto for no

src/mintpy/iono_split_spectrum.py

@@ -35,9 +35,10 @@ def run_iono_split_spectrum(inps):
     reference_point.main(cmd.split()[1:])
 
     # 3. estimate iono time-series
+    # hardwire "--dset unwrapPhase" to ignore dataset name change from unwrapping error correction options
     print('\n'+'-'*80)
     print('Estimate ionospheric delay time-series via ifgram_inversion.py ...')
-    cmd = f'ifgram_inversion.py {inps.iono_stack_file} -t {inps.template_file} -w no --update'
+    cmd = f'ifgram_inversion.py {inps.iono_stack_file} --dset unwrapPhase --weight-func no --update'
     print(cmd)
     ifgram_inversion.main(cmd.split()[1:])