How slopes are computed in Global Mapper ???

phoebekephoebeke Global Mapper UserPosts: 2
edited January 2011 in Technical Support

Could someone explain how slopes are computed in Global Mapper?
I loaded elevation data (xyz file) and exported the corresponding slopes (File=>Export Raster & Elevation Data=>Export Float/grid file & check the box "Export slope values instead of elevations".
But I haave no idea what the result does represent...
I assume a mean of slopes computed in a given number of directions over a certain distance to each point of interest... it is possible to get more details ?
I would like to receive a detailled answer :-)

Thank you very much in advance for your help !



  • global_mapperglobal_mapper Administrator Posts: 17,238
    edited January 2011

    The slope is defined as the square root of the sum of squares of the slope along the x axis and the slope along the y axis. Basically if your pixel is at (x,y), Global Mapper calculate the slope from (x-1,y) to (x+1,y) and makes this the x slope, then the slope from (x,y-1) to (x,y+1) and make this the y slope. The slope for the point is then defined as the square root of the sum of the squares of the calculate x slope and y slope.

    Let me know if I can be of further assistance.


    Global Mapper Support
  • phoebekephoebeke Global Mapper User Posts: 2
    edited January 2011
    Very clear !
    Thank you for your fast reaction.

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