+6I have a 2D point dataset with elevation information. They are not evenly distributed on the field. However, I would like to create a DEM based on the information I have. Which steps should I follow?
My final goal is to calculate the Surface Volume. Therefore I need to generate a DEM.
Thanks in advance.
Best answer by caracadrian
I would like to calculate the volume using the raster DEM. I have a base level from where the height will be calculating @caracadrian
You need to prepare your data for VolumeCalculator.
I recommend creating upper and lower surfaces, clipping them to the same footprint and using SolidBuilder to create a solid that FME can calculate volume on. You have to be careful on how you handle voids.
+47FME has a couple of options for this (DEM creation).
If you need a Raster DEM (e.g., GeoTIFF or ascii grid) then there is a tool called RasterDEMCreator, this lets you choose a tolerance and a output pixel size.
Alternatively if you want a triangulated mesh you can use the SurfaceModeller, this will output a TIN.
Alternatively if you just want regular points then you can use the DEMGenerator to get a grid of points to your desired resolution.
All option allow for the inclusion of breaklines if you have them.
+23Use 3DForcer to set Elevation to your elevation attribute values.
Input your 3d points to the Points/Lines port of DEMGenerator or SurfaceModeller, chose the Surface Tolerance, Interpolation Method and Cell Spacing.
Do what you need to do with your DEM.
+6Use 3DForcer to set Elevation to your elevation attribute values.
Input your 3d points to the Points/Lines port of DEMGenerator or SurfaceModeller, chose the Surface Tolerance, Interpolation Method and Cell Spacing.
Do what you need to do with your DEM.
I would like to calculate the volume using the raster DEM. I have a base level from where the height will be calculating @caracadrian
+6@caracadrian as you recommend it, I used 3DForcer to set the elevation. Then I wanted to use DEMGenerator however what should Breaklines be?
+23@caracadrian as you recommend it, I used 3DForcer to set the elevation. Then I wanted to use DEMGenerator however what should Breaklines be?
Breaklines are 3D lines that indicate a forced change of slope. For example the toe of a roadway or river edges.
They are very important when your points are not distributed evenly or to increase accuracy of your surface model.
+23I would like to calculate the volume using the raster DEM. I have a base level from where the height will be calculating @caracadrian
You need to prepare your data for VolumeCalculator.
I recommend creating upper and lower surfaces, clipping them to the same footprint and using SolidBuilder to create a solid that FME can calculate volume on. You have to be careful on how you handle voids.
