June 2005
Intermediate to advanced
568 pages
24h 7m
English
Content preview from Mapping Hacks
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Convert Geospatial Data Between Different Formats #68
Chapter 6, Mapping on Your Desktop
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323
HACK
gdal_translate and gdalwarp have plenty of other options, so don’t hesitate
to read their manpages!
Once More from the Top, with Vectors
That’s all well and good for raster data, but what about vector data? Fortu-
nately, the OGR half of the GDAL toolkit features a counterpart to gdalinfo
called ogrinfo. We can use ogrinfo to determine the features of a given vec-
tor data set as follows:
$ unzip tgr06075.zip
$ ls TGR*
TGR06075.MET TGR06075.RT4 TGR06075.RT7 TGR06075.RTC TGR06075.RTI TGR06075.
RTS
TGR06075.RT1 TGR06075.RT5 TGR06075.RT8 TGR06075.RTE TGR06075.RTP TGR06075.
RTT
TGR06075.RT2 TGR06075.RT6 TGR06075.RTA TGR06075.RTH TGR06075.RTR TGR06075.
RTZ
$ ogrinfo TGR06075.RT1
ERROR 4: Tiger Driver doesn't support update.
Had to open data source read-only.
INFO: Open of `TGR06075.RT1'
using driver `TIGER' successful.
1: CompleteChain (Line String)
2: AltName (None)
3: FeatureIds (None)
4: ZipCodes (None)
5: Landmarks (Point)
...
Here, we take the ZIP file from the Census Bureau’s download site contain-
ing the TIGER/Line data for San Francisco and unpack it into the current
directory. As you can see, the 2003 TIGER/Line data set contains 17 differ-
ent record types, plus a metadata file. ogrinfo shows the name of each layer,
along with the geometry type. If we give ogrinfo a specific layer name, it
returns the metadata ...
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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.