June 2017
Beginner
428 pages
10h 2m
English
Content preview from Practical GIS
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Removing columns
In the first example, let's delete some values from our administrative boundaries layer. If we inspect its attribute table, we can see some unnecessary columns. In my table, ID_0 and CCN_1 have constant values, which have absolutely no meaning to me. The CCA_1 and NL_NAME_1 columns are filled with null values, while VARNAME_1 is scarcely filled, therefore, I cannot use them. Let's pick every unnecessary column and remember their names. In the attribute table's toolbar, we can see some tools related to data management. We can add and remove columns; however, those options are disabled. We can enable them by starting an edit session by clicking on the first, Toggle editing mode button. With the editing options enabled, we can ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.