9.5. GIS Book: Contour creation
Contours are lines connecting points of equal value that represent continuous phenomena (Huisman & A. de By, 2009). Contours are called isolines, but may also have specific terms depending on … Read more
dem
9.3. GIS Book: Creation of slope maps
Slope is the main factor that determines and differentiates the shapes of the relief. Given two points of different altitudes, the slope of the terrain is understood to be the … Read more
9.2. GIS Book: Digital elevation models
A Digital Elevation Model (DEM) is a raster representation of a continuous surface. It usually refers to the earth’s surface, using a set of points whose X, Y and Z … Read more
Manipulating raster data in QGIS
I was encouraged to make this publication as a result of a consultation I had. Sometimes when we work with raster data, we need to modify some of its values, … Read more
Demarcation of endorheic basins in ArcGIS
Endorheic basins (internally drained) have no surface outlet (to a river) and lose water through evaporation and sometimes underground. In the traditional method of watershed delimitation, these internal drainage areas … Read more
Integrating a dike into a DEM in QGIS 3
In this case we developed a case study using tools available in QGIS 3. It will show how to alter a Digital Elevation Model (DEM) using the Raster calculator, specifically … Read more
Building a QGIS 3 Digital Elevation Model
On this occasion we will see how to generate a Digital Elevation Model (DEM) that reflects the shapes of the terrain using various vector entities. In QGIS 3 it is … Read more
3D Flood Simulation in ArcGIS
In ArcScene you can simulate floods to know which parts would be affected if a flood were to occur. Although it is only visual, it gives you a general idea … Read more
Download a free Digital Elevation Model (DEM)
Digital Elevation Models (DEM) have multiple applications. It is possible to download a DEM from anywhere in the world for free from the ASTER GDEM, page, registration is required, although … Read more
View the relief of a satellite image in ArcGIS
If it is required to display the relief or altitude of a satellite image (as shown in the Google Earth application) the first requirement is to have a digital elevation … Read more
Zonal Statistics with ArcGIS
The zonal statistics tool allows you to calculate various statistics for one or more previously defined zones, based on the data of an existing raster image. For example, in a … Read more