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I tried to set up MapServer SOS and could run GetCapabilities and DecsribeSensor perfectly. But I faced a problem regarding to GetObservation: the SOS doesn't return anything. You may see the map file I have created below:
SIZE 400 300
EXTENT -180 -90 180 90
IMAGECOLOR 255 255 255
Although I put 6 observations into the shapefile but the SOS doesn't return any. I have also tested it by retrieving data from PostGIS and it did not work. Would you please let me know what I should do to resolve the problem?!