QGIS Raster Interpolation

In this video we use interpolation application to create new raster layers from vector layers. We'll create a DEM from 5m contour lines and a groundwater quality raster from borehole data.
Timestamps
1:10 Open project
2:17 Add 5m contours
3:19 Processing tools
4:05 TIN Interpolation
06:45 Styling the DEM
11:34 Slope Analysis
12:55 Slopes as degree of inclination
13:24 Calculate slopes of 1:5
15:00 Identifying slopes with the Raster Calculator
17:43 Converting a raster to a polygon
20:26 Hillshade
22:46 IDW Interpolation
26:40 Styling the Electrical Conductivity raster
QGIS - qgis.org
Spatial Modelling Solutions - www.smsgis.co.za

[@gregmoorcroft247]

Thanks Ian, that all worked really well. Also love your square-lipped rhino picture!

[@raretapes8057]

Super helpful! Thank you.

[@PaigeMTL]

Good stuff

[@benjaminl3084]

Is creating a DEM possible from two sets of contours? I have a topo map and bathymetric lake depth contours. Can I list both in the contour height values? Topo would be positive and lake negative?

[@visualimpactconsultant5672]

When using the vector layer, should I first set z values or can you use the height attribute as is? Should height be 'real"?

[@mra4955]

Thanks for the great tutorial. My height attribute is labelled 'elevation'. I cannot seem to select elevation under 'interpolation attribute' when creating the tin for some reason. Not all the values are showing up. Any ideas? Thanks in advance

[@Qtips1]

It is possible that your elevation field is a string and not a number.

[@binodbhatta3491]

Hey, I have LiDAR DEM data, but which represent only water surface elevation along the river channel. So I've to edit/interpolate my DEM with RTK points to make or capture the real elevation of Ground points along the river channel. Do you have any suggestions? How to do this??/

[@Hometmc]

Which tutorial are you referencing?

[@Qtips1]

Hi Tim, many of the tutorials referenced won't be posted to KZbin as they are from my client GIS training workshops.

[@user-qy6di2fr1v]

isolines in Qgis ????