Hello, is it possible that someone share with me the knowledge how DecimalDegreesCalculator transformer exactly is calculating the decimal degrees from Degrees Minutes Seconds (DMS)? Is this the formula for it?
Decimal Deg = Deg + Min / 60 + sec / 3600I think so, if the Deg is positive value. Why not confirm that with a workspace like this?
If you copy the transformer and paste it into a text editor, you can see the code (including typo in the comment!) that runs the conversion:
# Comvert to decimal and set the attribute
Tcl2 proc DecimalDegreesCalculator_dms2decimal {} { \
set deg [DecimalDegreesCalculator_fetchAndTrimOffLeading0s {ParkId}]; \
set min [DecimalDegreesCalculator_fetchAndTrimOffLeading0s {ParkId}]; \
set sec [DecimalDegreesCalculator_fetchAndTrimOffLeading0s {ParkName}]; \
if { [string index $deg 0] == {-} } { \
set decimalValue [expr $deg - $min/60.0 - $sec/3600.0]; \
} else { \
set decimalValue [expr $deg + $min/60.0 + $sec/3600.0]; \
}; \
FME_SetAttribute [FME_DecodeText {_decimal_degrees}] $decimalValue; \}So, yes, it's as you say, depending on whether it's positive or negative coordinates.