June 2005
Intermediate to advanced
568 pages
24h 7m
English
Content preview from Mapping Hacks
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Make Free Maps of the United States Online #14
Chapter 2, Mapping Your Neighborhood
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57
HACK
Mapping a List of Points
It gets even better. What if you want to display more than one marker on the
map at a time? See the text field labeled Marker URL? It turns out that if you
make a list of waypoints, you can put it on the Web somewhere and use the
Marker URL field to tell the TIGER server to fetch it and map it. Here are
the first six entries in a list of geysers in Yellowstone National Park, taken
from the GNIS
[Hack #85] and rendered in the TIGER Map Server’s ad hoc
Marker URL “format”:
# Excerpted list of GNIS geyser features from Park County, WY
-110.4347,44.6203:red5:Black Dragons Cauldron
-110.6833,44.7000:red5:Fearless
-110.8167,44.7167:red5:Jet
-110.7528,44.6833:red5:Monument
-110.4333,44.6247:red5:Mud Volcano
-110.7067,44.7056:red5:Porkchop
The first line is a comment, as indicated by the hash mark (#) at the begin-
ning of the line. For the remainder of the file, each line is a waypoint, with
three colon-separated fields. The first field is
longitude, latitude, separated
by a comma. The next field is the marker type, which we’ll get into more
detail about in a minute. Finally, the last field is just the name of the way-
point. This particular file contains a total of nine entries. If we post the file
at http://mappinghacks.com/data/geysers.txt, we can put that URL into the
TIGER Map Server web
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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.