I am using ArcMap 10.4.1 reviewing some concepts of a projection. The data frame properties look like the below screen shots. Under the Standard Parallels is listed 2:34.83333 or 1:32.5. are these standard parallels meant to be read as degrees and minutes ?
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The visual rules
45.50000 Decimal degrees
45 30.000 degrees decimal minutes
45 30 30.0000 degrees minutes seconds
The integer portions break down denote major D M or S
the decimal number indicates what is not integer.
So in the case of decimal degrees above, there is no integer, hence it is decimal degrees
In the case of degrees decimal minutes, the minutes has the decimal a the degrees portion is an integer
In the case of degrees, minutes, seconds, the seconds have decimals and the degrees and minutes portions are integers
Variants exist, just remember that decimal degrees is what is needed in the digital world and all other variants must be converted to them. From there, you can introduce a projected coordinate system using the decimal degree data as inputs