Book Image

QGIS By Example

By : Daria Svidzinska
Book Image

QGIS By Example

By: Daria Svidzinska

Overview of this book

If you are a beginner or an intermediate GIS user, this book is for you. It is ideal for practitioners, data analysts, and application developers who have very little or no familiarity with geospatial data and software.
Table of Contents (12 chapters)
11
Index

Step 4 – Analyze and prepare the data


There are three main approaches to primary data analysis. These depend on the initial data type and available attributes:

  • Rasterizing and ranking categorized vector layers: These are the layers that already contain all the necessary values, and at the preparation stage, all of them should be rasterized to the similar extent and resolution. Also, their categories should be ranked properly, with the highest values for the most suitable areas and vice versa. Examples of these layers are hurricane_evacuation_zones, hurricane_inundation_zones, and so on.

  • Ranking density rasters: These are raster heat maps that should be converted from continuous coverages to categorized values where the highest value symbolizes the most appropriate area, and the lowest is related to the least suitable area. Examples of these layers are noise_heatmap and tree_density.

  • Generating and ranking proximity rasters: This is the most tedious workflow. Vector layers should be rasterized...