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Update scene_io.py #72

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28 changes: 23 additions & 5 deletions src/scene_io.py
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Original file line number Diff line number Diff line change
Expand Up @@ -765,7 +765,8 @@ class GMTSAR(SceneIO):
Expects:

* Displacement grid (NetCDF, :file:`*los_ll.grd`) in meter
(in case use "gmt grdmath los_cm_ll.grd 0.01 MUL = los_m_ll.grd')
(in case use "gmt grdmath los_cm_ll.grd 0.01 MUL = los_m_ll.grd').
If grid file is in netCDF4 format, the python library netCDF4 is needed.
* LOS binary data (see instruction, :file:`*.los.enu`)

Calculate the corresponding unit look vectors with GMT5SAR ``SAT_look``:
Expand Down Expand Up @@ -809,12 +810,29 @@ def _getDisplacementFile(self, path):

def read(self, path, **kwargs):
from scipy.io import netcdf
import subprocess

path = op.abspath(path)
c = self.container

grd = netcdf.netcdf_file(self._getDisplacementFile(path),
filename = self._getDisplacementFile(path)
command = "ncinfo " + filename
subtext = subprocess.Popen(command,
stdout=subprocess.PIPE,
shell=True)
(ncinfo, err) = subtext.communicate()
ncinfo = str(ncinfo)
if ((ncinfo.find('netCDF4')>0) & (ncinfo.find('NETCDF3')<0)):
print('GMTSAR grid in netcdf4')
from netCDF4 import Dataset
grd = Dataset(self._getDisplacementFile(path), 'r')
else:
print('GMTSAR grid in netcdf3 classic')
grd = netcdf.netcdf_file(self._getDisplacementFile(path),
mode='r', version=2)
grd = netcdf.netcdf_file(self._getDisplacementFile(path),
mode='r', version=2)

displ = grd.variables['z'][:].copy()
c = self.container
c.displacement = displ
shape = c.displacement.shape
# LatLon
Expand All @@ -834,7 +852,7 @@ def read(self, path, **kwargs):
n = los[4::6].copy().reshape(shape)
u = los[5::6].copy().reshape(shape)

phi = num.arctan(n/e)
phi = num.arctan2(n,e)
theta = num.arcsin(u)
# phi[n < 0] += num.pi

Expand Down