Desktop GIS: Mapping the Planet with Open Source Tools by Gary E. Sherman

By Gary E. Sherman

Desktop GIS explores the realm of Open resource GIS software program and gives a consultant to navigate the numerous concepts to be had. humans around the globe are effectively utilizing OSGIS for his or her day-by-day wishes. it's also possible to subscribe to the ranks and Desktop GIS will advisor you alongside the best way. become aware of what sort of GIS consumer you're and lay the root to judge the choices and judge what software program is healthier for you.

frightened approximately utilizing Open resource software program? Desktop GIS addresses this obstacle and others through analyzing the demanding situations linked to assembling and utilizing an OSGIS toolkit. concepts for selecting a platform, selecting the best instruments, integration, dealing with swap, and getting aid are awarded.

The survey of OSGIS computer purposes offers you a short advent to the various applications to be had. either GUI (Graphical person Interface) and command line are brought with examples to offer you a think for what's on hand.

after you have a seize of the OSGIS panorama, the e-book delves right into a specified examine the key machine functions, together with GRASS, Quantum GIS, uDig, spatial databases, GMT, and different command line instruments. ultimately the booklet exposes you to scripting within the OSGIS international, utilizing Python, shell, and different languages to accomplish GIS operations and create output.

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8 Don’t worry if you aren’t a SQL expert or don’t even know what it stands for—QGIS makes it easy, as we will see. Say, for example, we want to find all the cities in the world with more than 2 million people that are also capital cities. We can easily do this with the Search Query Builder. To access the builder, open the attribute table, and click the Advanced button. 19, on the following page. Now let’s take a look at how this dialog box works. The fields in the attribute table are listed on the left side of the dialog box.

6. 10 Next Step We’ve gotten much of the preliminaries out of the way, learned a bit about what OSGIS can do for us, and also looked at some of the things to keep in mind along the way. Now it’s time to get into some software and actually do something. If you want to get the “birds-eye” view of what’s available in the open source desktop GIS world, take a look at Appendix A, on page 269. Now let’s get going and view some data. 0 printing, August 2008) Chapter 3 Working with Vector Data In this chapter, we’ll start working with vector data (points, lines, polygons) by viewing, editing, and analyzing various datasets.

When searching, there are three options you can choose from: • Select: Select the features that match. • Select and Bring to Top: Select the features that match and promote them to the top of the attribute table display. • Show Only Matching: Show just the features that match. Which option you choose depends on the purpose for selecting the features. If you just want to select them so you can zoom the map to the selection set, then the first option is sufficient. If you want to view the attributes of the selection set, then the second option is the one you want.

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