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My DEM raster coordinates are in WGS84: 45.4763884,-121.5736061 and vertical units are in feet I believe. I want to do a slope analysis. Do I need to add scale factor?

I have been seeing different answers all over and am confused.

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marked as duplicate by Andre Silva, whyzar, xunilk, aldo_tapia, BERA Jan 3 '18 at 11:02

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    Point some different answers you have seen. – user30184 May 15 '17 at 18:29
  • on a different forum, one person said to use 111120 and then another person said not to because that is only valid a equator. – MrCarbon May 15 '17 at 18:48
  • gis.stackexchange.com/a/95344/96925 This answer says to use 370400. – MrCarbon May 15 '17 at 18:48
  • I also tried calculating my own using this answer's suggested formula for vertical units in "feet" gis.stackexchange.com/a/95397/96925 – MrCarbon May 15 '17 at 18:50
  • Actually I just found out my DEM has vertical units in Meters. – MrCarbon May 15 '17 at 20:25

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