GIS coaching for territorial management.
It is not easy, in geomatics, to get a good grasp of the geodesy notions that underlie the manipulation of geographic data. Unfortunately, many users do not have a sound knowledge of these concepts. I have…
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In the previous article, ArcHydro: determination of the watersheds of a territory (1), we analysed points 1, 2, and 3. In this article, we will discussed the last three points: – Segmentation of the network flow…
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We will use ArcHydro to calculate the different whatersheds of a given territory. It is not only important to know the different steps to achieve the desired result, but also the assumptions we will be using.…
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ArcHydro Presentation ArcHydro is a set of data models and tools that work under ARCGis to support the data analysis of superficial water resources. You can use ArcHydro to delineate and characterize the watershed lines, define…
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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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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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