I added a line shapefile to a surface using the Arc map 10.3 In order to calculate the 3D length and slope of each feature line The result was as in the picture.

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What is the distinction or the unit of the number written in the slope field?

How can I read it or convert it to a slope degree?

closed as off-topic by PolyGeo Oct 2 '17 at 21:39

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As far as I know, slopes in ArcMap are always calculated in either degrees or percent. Since the highest a degree slope can be is 90 degrees, and your slope value is 587, yours must be in percent. I'm guessing you used the Add Surface Information tool, which according to the help produces slope results in percent:

Slope values are measured in percentage units (grade) and, for line features, get calculated at each segment along the line.

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