Defining a Topography
It is not necessary to define a topography to model in Leapfrog Geo, but a defined topography can be used as an upper boundary for all models built in the project.
A key advantage of defining a topography is that it provides consistent elevation data for objects imported to and created in the project. The quality of elevation information can be poor compared to X- and Y-coordinates, which can create problems when using objects to build a model. A topography can be created from the most reliable elevation data, and other objects can have elevation set from this topography.
An important consideration when defining the topography is ensuring that it is large enough to encompass the models you will be building in the project. If you create a small topography but then later create a model that extends outside the topography, you will need to enlarge the topography, which can result in considerable reprocessing of all objects in the project that use the topography as a boundary.
The topography can be created from:
- An imported elevation grid
- Points data, including the collars in imported drillhole data
- GIS data
It is not necessary to decide on a single source of information, as information can be combined. Once the topography has been defined, additional height data can be added by right-clicking on the topography and selecting from the options available. See Adding Height Data to the Topography for more information. You can add and remove data as required.
If you don’t have any data suitable for creating a topography, you can set a fixed elevation. See Fixed Elevation Topography.
Once defined, you can export the topography as a mesh or as an elevation grid. See: