Question
coordinate system transformation
+3- Contributor
When using the Reprojector transformer FME logs the transformation in the log file. Below is an example from a log file: Reprojector: Using transformation `NAD27_to_NAD83_Canada_FME,Forward(Grid File Interpolation,EPSG:1313)' when reprojecting from LL-27 to EPSG:4326 Is there any way to ``capture`` the transformation used in an attribute or anything that can be written out? Thanks, CA
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Hi,
This may not be an ideal solution, but it's possible to collect only the messages which match with a specific condition using Python.
A PythonCaller with this script, for example, provides a functionality to collect every message which starts with "Reprojector:".
----- import fmeobjects g_messageList = [] # Callback function to collect every message # which starts with "Reprojector:". def collectMessages(severity, message): if message.startswith('Reprojector:'): g_messageList.append(message) class LogCallbackSetter(object): def __init__(self): # Set the callback function to log file object. logger = fmeobjects.FMELogFile() logger.setCallBack(collectMessages) def input(self, feature): self.pyoutput(feature) def close(self): pass
-----
Insert the PythonCaller before the Reprojector, then you can refer to the messages stored in "g_messageList" using Shutdown Python Script or another PythonCaller.
Example 1: This shutdown script writes the messages into a text file.
----- f = open('C:/tmp/messages.log', 'w') for msg in g_messageList: f.write('%s\\n' % msg) f.close()
-----
Example 2: A PythonCaller with this script adds the messages to each feature as a list attribute. In this case, a FeatureHolder should be inserted between the Reprojector and this PythonCaller in order to complete collecting messages.
-----
import fmeobjects class MessageExtractor(object): def __init__(self): pass def input(self, feature): feature.setAttribute('messages{}', g_messageList) self.pyoutput(feature) def close(self): pass
-----
Takashi
Correction: There is no need to use a FeatureMerger in Example 2.
Example 3: This script can be used instead of Example 2.
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import fmeobjects def setMessages(feature): feature.setAttribute('messages{}', g_messageList) -----
Takashi
+22- Safer
You could also just read the log file and extract the info, that is if you dont need it for the same translation.