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14.2 Slope versus Horizontal Map Distance <br />Map distance is found by multiplying slope distance by the map scale. This is not techni- <br />cally correct, but because of the many variables that exist in the real world, the difference <br />between slope distance and horizontal distance is not critical. The Slope vs horizontal <br />map distance tool (Figure 66) is provided to make a conversion of slope map distance <br />to horizontal map distance in case you want to make the correction before you plot a dis- <br />tance on a map. (The tool requires slope input as a percentage and gives the associated <br />value in degrees.) <br />CaledaaedMap Dislavice (m, cm) <br />Madnesm qw- Seery. Knee N <br />qp <br />Caludak <br />M= Slops Skelmse(dogrow) <br />1.6 <br />Upslopo, 0 Draees <br />1.9 <br />15 Degeee hvm Updepe <br />1.4 <br />30 Domes from 1Updape <br />1.9 <br />4STJWP-fmmUpdW_ <br />-4 <br />60 Dcg—fro® UpslOpc <br />2.0 <br />75 Dag= fmm Upslope <br />P-6- <br />7q-Cross-depe. <br />Cron-A".90 Dap oes <br />FO <br />P Future P Heb <br />j <br />fmd I Laeme <br />-I Y <br />Slept vs <br />It ITririzantal Map <br />Distanee Tool <br />Whom I*cctheopeonDwaVOLOW <br />dWawww +tel "made from 60 W" <br />Set a on ditdop. the Nowb¢ Age distances <br />($e distance onthe gov4 are courarb" b <br />aryv disLar:ea <br />. Swfice spread didmce ISPR ADI <br />• <br />Crown spread distaffie [LRCM q <br />sForw"*read disboce.711 ►.J <br />Figure 66 --The Slope vs horizontal map distance tool converts a calculated map distance on <br />the slope to a horizontal distance given the maximum slope steepness and various directions with <br />respect to upsiope. <br />14.3 Slope from Map Measurements <br />Slope steepness can be directly entered into a SURFACE worksheet, or it can be calcu- <br />lated from map measurements by changing the input option on the Slope tab (Figure 67). <br />The Slope Outputs tab lets you select the calculated slope and intermediate values as <br />outputs. Because BehavePlus builds a worksheet that requests only required input values, <br />you can build a simple slope calculation worksheet by selecting only the above input op- <br />tion and slope output variables (Figure 67). Conversely, you can use the Slope from map <br />measurements tool if slope steepness is the only desired output (Section 14.5). <br />s0 USDA Forest Service Gen. Tech. Rep. RMRS-GTR-249.2010 <br />