topic Re: Determining the difficulty/grade of hiking tracks/trails in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/determining-the-difficulty-grade-of-hiking-tracks/m-p/444776#M6296 <HTML><HEAD></HEAD><BODY><P>definitely one way... you could also incorporate the concept of the length of a slope as well ... it will be more difficult to follow a 10 deg slope for 1 km than one that is only 10 meters.</P></BODY></HTML> Wed, 30 Aug 2017 21:09:04 GMT DanPatterson_Retired 2017-08-30T21:09:04Z Determining the difficulty/grade of hiking tracks/trails https://community.esri.com/t5/arcgis-spatial-analyst-questions/determining-the-difficulty-grade-of-hiking-tracks/m-p/444773#M6293 <HTML><HEAD></HEAD><BODY><P>So I have mountain trails/tracks as polylines and I want to determine their difficulty/grade: easy, medium, difficult. In order to do that I have to work with slopes and elevation. I am using ASTER SRTM for that manner. I followed <A href="https://blogs.esri.com/esri/supportcenter/2012/03/09/calculating-the-slope-of-a-hiking-trail/">these instructions</A>&nbsp;but the values I'm getting for the slopes are weird (see the picture).<IMG __jive_id="369215" alt="" class="image-1 jive-image j-img-original" src="https://community.esri.com/legacyfs/online/369215_wrong.png" style="width: 620px; height: 372px;" /></P><P>What am I doing wrong here? Is there any other way for me to find the difficulty of the tracks?</P><P></P><P>Thanks in advance.</P></BODY></HTML> Wed, 30 Aug 2017 19:01:59 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/determining-the-difficulty-grade-of-hiking-tracks/m-p/444773#M6293 PetarTraykov 2017-08-30T19:01:59Z Re: Determining the difficulty/grade of hiking tracks/trails https://community.esri.com/t5/arcgis-spatial-analyst-questions/determining-the-difficulty-grade-of-hiking-tracks/m-p/444774#M6294 <HTML><HEAD></HEAD><BODY><P>how are you calculating slope?&nbsp; And by the looks of your shape_length field, I suspect that you aren't using projected data but your coordinates are in decimal degrees and your elevations are in meters.&nbsp; Project your file to a suitable projection so that all your positional values are in planar units.&nbsp; Once you have fixed that, then make sure you decide whether to record slope as either a percentage or in degrees...&nbsp;</P></BODY></HTML> Wed, 30 Aug 2017 19:07:26 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/determining-the-difficulty-grade-of-hiking-tracks/m-p/444774#M6294 DanPatterson_Retired 2017-08-30T19:07:26Z Re: Determining the difficulty/grade of hiking tracks/trails https://community.esri.com/t5/arcgis-spatial-analyst-questions/determining-the-difficulty-grade-of-hiking-tracks/m-p/444775#M6295 <HTML><HEAD></HEAD><BODY><P>Thank you! You saved me <IMG src="https://community.esri.com/legacyfs/online/emoticons/happy.png" />&nbsp;</P><P>Do you think this is the proper method for determining the difficulty of the trails?</P></BODY></HTML> Wed, 30 Aug 2017 19:15:25 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/determining-the-difficulty-grade-of-hiking-tracks/m-p/444775#M6295 PetarTraykov 2017-08-30T19:15:25Z Re: Determining the difficulty/grade of hiking tracks/trails https://community.esri.com/t5/arcgis-spatial-analyst-questions/determining-the-difficulty-grade-of-hiking-tracks/m-p/444776#M6296 <HTML><HEAD></HEAD><BODY><P>definitely one way... you could also incorporate the concept of the length of a slope as well ... it will be more difficult to follow a 10 deg slope for 1 km than one that is only 10 meters.</P></BODY></HTML> Wed, 30 Aug 2017 21:09:04 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/determining-the-difficulty-grade-of-hiking-tracks/m-p/444776#M6296 DanPatterson_Retired 2017-08-30T21:09:04Z