In a previous post I showed a hypothetical floodplain map of St Helena, Trinidad. This is a lot of flooding! St Helena is one of those areas that are notorious for flooding whenever rain starts to fall in the area. But why? The answer is mainly its location. St Helena lies between two rivers: CaroniContinue reading “St Helena Trinidad, Flooding Causes”
Tag Archives: Terrain
Maracas Watershed 3D Map – Take 2
I wanted to revisit the 3D map of the Maracas watershed I did a few weeks ago, but this time using the Shaded Relief symbology that I experimented with. This map uses the default hillshade parameters. It wasn’t necessary to accentuate the vertical features as this is a more localised area. This map shows theContinue reading “Maracas Watershed 3D Map – Take 2”
Hillshade Testing
When I was putting together the map showing the Topography of the Caroni River Basin, I go up to speed on 3 important parameters when generating a Hillshade: Z Factor, Azimuth, and Angle. Here is a quick comparison of these factors. The Z factor is used to exaggerate the vertical features of the terrain byContinue reading “Hillshade Testing”
Caroni Watershed Topography
A map showing the topography of the Caroni River Basin. Topography is the study of the land surface, which includes its physical features such as hills and valleys. This one isn’t too bad and I learnt a few things about hillshade which I will hopefully share in a future post. The purpose of this mapContinue reading “Caroni Watershed Topography”
Create a Terrain
Now that we have a project setup and a projection defined, we can import the terrain. It is recommended that you clip the terrain raster to a buffer of the basin boundary. I used a buffer of 1km because if any part of 2D mesh extends beyond the terrain, the model will not run. IContinue reading “Create a Terrain”
Mapping T&T 