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fmeobjects.FMECoordSysManager() not working in defining a coordinate system in FME 2024.

  • February 9, 2026
  • 2 replies
  • 19 views
aguan
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I dug out one of my old FME 2014 workbenches. It has this PythonCaller defining a local CRS. It had worked beautifully for years.

import pyfme

#define custom CRS
myCSMan = pyfme.FMECoordSysManager()
fmeParams = {}
fmeParams['CS_NAME'] = "local_polyconic_cs"
fmeParams['DESC_NM'] = "Dynamic CS"
fmeParams['DT_NAME'] = "WGS84"
fmeParams['PROJ'] = "PLYCN"
fmeParams['UNIT'] = "FOOT"
fmeParams['X_OFF'] = 0.0
fmeParams['Y_OFF'] = 0.0
fmeParams['MAP_SCL'] = 1.0
fmeParams['SCL_RED'] = 0.9996
fmeParams['SOURCE'] = "HESS"
fmeParams['QUAD'] = 1
fmeParams['ZERO_X'] = 0.0001
fmeParams['ZERO_Y'] = 0.0001

surf_lat = float(feature.getAttribute('surf_lat'))
surf_long = float(feature.getAttribute('surf_long'))
        
fmeParams['PARM1'] = str(surf_long)
fmeParams['ORG_LAT'] = str(surf_lat)

myfmeCS = myCSMan.defineCoordSys(fmeParams, "myfmeCS")

 

Now I am at FME 2024 where pyfme has been replaced by fmeobjects. So I made the changes like below:

 

import fmeobjects

myCSMan = fmeobjects.FMECoordSysManager()

…

#defineCoordSys only takes one parameter

myfmeCS = myCSMan.defineCoordSys(fmeParams)

 

The last line gives this error:

Message Type: fme::internal::_v0::py::Exception
Python Exception <TypeError>: Could not convert Python coord system parameters.
Error encountered while calling method `input'
PythonCaller_5 (PythonFactory): PythonFactory failed to process feature
 

Any idea?

 

Allen

Best answer by david_r

The problem is that the method defineCoordSys() has changed, it now takes only coordSysParms (a dict[str, str] or pairwise list[str]).

Try something like this:

import fmeobjects

# Define custom CRS
myCSMan = fmeobjects.FMECoordSysManager()

# Static parameters
fmeParams = {
    'CS_NAME': 'local_polyconic_cs',
    'DESC_NM': 'Dynamic CS',
    'DT_NAME': 'WGS84',
    'PROJ':    'PLYCN',
    'UNIT':    'FOOT',
    'X_OFF':   '0.0',
    'Y_OFF':   '0.0',
    'MAP_SCL': '1.0',
    'SCL_RED': '0.9996',
    'SOURCE':  'HESS',
    'QUAD':    '1',
    'ZERO_X':  '0.0001',
    'ZERO_Y':  '0.0001',
}

# Dynamic parameters
fmeParams['PARM1'] = str(feature.getAttribute('surf_long'))
fmeParams['ORG_LAT'] = str(feature.getAttribute('surf_lat'))

# defineCoordSys now takes a single arg and returns the unique CS name
cs_name = myCSMan.defineCoordSys(fmeParams)

See also https://docs.safe.com/fme/html/fmepython/api/fmeobjects/_coordsys/fmeobjects.FMECoordSysManager.defineCoordSys.html#fmeobjects.FMECoordSysManager.defineCoordSys

2 replies

david_r
Celebrity
  • david_rCelebrity
  • Best Answer
  • February 9, 2026

The problem is that the method defineCoordSys() has changed, it now takes only coordSysParms (a dict[str, str] or pairwise list[str]).

Try something like this:

import fmeobjects

# Define custom CRS
myCSMan = fmeobjects.FMECoordSysManager()

# Static parameters
fmeParams = {
    'CS_NAME': 'local_polyconic_cs',
    'DESC_NM': 'Dynamic CS',
    'DT_NAME': 'WGS84',
    'PROJ':    'PLYCN',
    'UNIT':    'FOOT',
    'X_OFF':   '0.0',
    'Y_OFF':   '0.0',
    'MAP_SCL': '1.0',
    'SCL_RED': '0.9996',
    'SOURCE':  'HESS',
    'QUAD':    '1',
    'ZERO_X':  '0.0001',
    'ZERO_Y':  '0.0001',
}

# Dynamic parameters
fmeParams['PARM1'] = str(feature.getAttribute('surf_long'))
fmeParams['ORG_LAT'] = str(feature.getAttribute('surf_lat'))

# defineCoordSys now takes a single arg and returns the unique CS name
cs_name = myCSMan.defineCoordSys(fmeParams)

See also https://docs.safe.com/fme/html/fmepython/api/fmeobjects/_coordsys/fmeobjects.FMECoordSysManager.defineCoordSys.html#fmeobjects.FMECoordSysManager.defineCoordSys

    aguan
    Supporter
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    • aguanSupporter
    • Author
    • Supporter
    • February 9, 2026

    ​@david_r That seems to work, thanks a lot.

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