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How-to Calculate a Slope

Introduction

This How-to will walk through how to create a slope calculation and how to interrogate the data.

Creating a slope calculation 

To be able to calculate a slope you will first need to open either a project containing a surface or create a scene containing a surface.

For more information on these processes, see https://qpssoftware.scrollhelp.site/fledermaus/slope-calculations-algorithm

Step-by-step

Step 1: Creating a slope calculation

  1. Select the surface you wish to use for the slope calculations

  2. Either using the right click menu or the operations menu select the Slope... option 

    image2020-7-14_16-3-16.png


    Figure 1: Operations menu

  3. The calculate slope window will then launch

    image2020-7-14_16-13-23.png


    Figure 2: Calculate Slope window

  4. There are several options available here, for more information please click here for the information in our reference manual. 

  5. Once the options have been selected Click OK 

Step 2: Colouring surfaces by slope

  1. In the Scene Objects window select the colour by option

  2. Select the Attached Scalar option

    image2020-7-14_16-44-1.png


    Figure 3: Color by options

  3. This will give you a different view of the surface

image2020-7-14_17-10-20.png
Figure 4a: Color by height

image2020-7-14_17-13-9.png
Figure 4b: Color by scalar

Step 3: Interrogation of the slope

  1. To view the actual slope value for a cell it is possible just to scroll over the surface and observe the bottom left of the screen. 

    image2020-7-14_17-16-25.png


    Figure 5: Surface information with Scalar value

  2. It is also generally better to use a fixed value color map to view the slope values quickly. Please see the How To: Colormap page for this. 

Additional Information