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
raster
9.4. GIS Book: Reclassifications
The Reclassify tool allows the values of a raster to be reclassified; that is, it replaces the current values of each cell with new information. Data can be reclassified from … Read more
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
6.6. GIS Book: Define projection of a layer
At certain times when loading new layers into ArcMap, a warning message (“The following data sources you added are missing spatial reference information. This data can be drawn in ArcMap, … 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
Introduction to the use of SpatiaLite and Geopackage in QGIS 3
In addition to the traditional raster and vector files QGIS 3 also allows the implementation of Spatial Databases such as PostGIS, as well as light alternatives such as Spatialite and … Read more
Tools for spectral and multitemporal analysis in QGIS 3
The study of land cover using satellite images requires tools that facilitate their interpretation, especially those that can integrate multiple raster, allowing the evaluation of the spectral behavior of the … Read more
How to calculate Land Surface Temperature with Landsat 8 satellite images
The Land Surface Temperature can be estimated or calculated using the Landsat 8 thermal bands. It simply requires applying a set of equations through a raster image calculator (ArcMap, ArcGIS … 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
Extract values from a raster to a table with ArcGIS
To extract values from one or more raster images to a table, the Extract Multi Values to Points tool is the one indicated. The operation is simple, extracts the values … Read more