# How slopes are computed in Global Mapper ???

phoebeke
Global Mapper UserPosts:

**2**
Hello,

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 !

Patrick

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 !

Patrick

## Comments

17,238The 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.

Thanks,

Mike

Global Mapper Support

support@globalmapper.com

2Thank you for your fast reaction.

Patrick