June 2005
Intermediate to advanced
568 pages
24h 7m
English
Content preview from Mapping Hacks
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Chapter 6, Mapping on Your Desktop
#75 Share Your GRASS Maps with the World
HACK
HACK
#75
Share Your GRASS Maps with the World Hack #75
Export your carefully crafted GIS layers into human-compatible formats.
If you’ve worked through the GRASS hacks in this book, you might have
noticed a standard finale: “Now see “Share Your GRASS Maps with the
World”
[Hack #75] to export your maps to an image file.” Having got this far,
congratulations! Now the world can know of your triumphant ascent of the
GRASS learning curve.
The r.out set of GRASS functions provides many ways to export your raster
layers into different GIS-compatible formats, such as ESRI’s ArcInfo, binary
vector format, etc. However, the most useful formats to share map data in—
PNG for viewing on the Web, or PostScript for print publication—both
involve some fiddling.
Publish Raster Maps as PNG Images
In the simplest case, you might just have a raster layer in GRASS that you
want to export as a PNG image. r.out.png is ideal for these purposes:
GRASS:~ > r.out.png in=nations out=nations.png
rows = 2250, cols = 4500
Converting nations... 96%
Done.
You should note that r.out.png, like most GRASS raster functions, only
operates on the current region. Be sure to run
g.region rast=... first if you
want to export the whole raster layer.
Publish PNG Images via the Display Monitor
If you have a whole set of different layers you want to export together,
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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.