Author: Atilio Francois

KML: Getting Started

KML(Keyhole Markup Language) is an XML data format used to display information in a geographical context. Just as Web browsers read and display HTML files,  land-based browsers such as Google Earth read and display KML files. KML is a language readable byeveryone , composed of text and punctuation . It can be created and edited through a basic text editor, saved, and then previewed in a land-based browser . You do not need to be a wizard to master the basics of KML, and you’ll notice than this knowledge will make it possible to create powerful presentations that depict your geographical data and images on the numerous land-based free browsers such as : Google Earth, Microsoft…

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Make a  topographic map with QGis

Thanks to the SRTM project we can access to a comprehensive world coverage of land elevation data. It has become very simple to create one’s own  topographic maps with QGis . We will discuss here : Download elevation Data To download the  elevation data  of your area of interest , go on page http://viewfinderpanoramas.org/dem3.html This video  shows you   the progress of the download . The data available  corresponds…

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The spatial-temporal cube of ArcGis : 2- Hot and Cold Spots

In the previous article (Le Cube spatio-temporel d’ArcGis : 1- découverte) we discussed how to create a spatial-temporal cube from a cloud of XYZ points.   The points are grouped into ” boxes ” (bins) corresponding to 3D pixels. We have discussed how to depict them in an ArcGis Pro 3D scene. In this article we will discuss how to analyze the…

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The spatial-temporal cube of ArcGis : 1- discovery

One of the domains of GIS where still remains a lot to be done is the field of temporal analysis  . While almost all the available tools focus on the spatial evolution of a phenomenon, we are left helpless when trying to visualize or analyse a phenomenon that changes as a function of time as well. For some time, we have…

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