June 2005
Intermediate to advanced
568 pages
24h 7m
English
Content preview from Mapping Hacks
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Find Your House on an Aerial Photograph #4
Chapter 1, Mapping Your Life
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15
HACK
Hacking Terraserver
The Terraserver web site generates URLs for images that look like this:
GetImageArea.ashx?t=1&s=10&lon=-122.842232&lat=38.411908&w=600&h=40
The t parameter indicates which type of base map you want. t=1 shows you
aerial maps, and
t=2 shows topographical maps published by the USGS.
The
s parameter represents a scale—from 10 for small-scale maps at 1-meter
resolution, to 19 for large-scale maps at 512-meter resolution.
Back in the day, the good people at ACME Maps provided their own, home-
hacked version of a programmatic interface to Terraserver. It allowed you to
post coordinates directly and get back map tiles neatly sewn together. It’s
still available at http://acme.com/mapper/.
Now the Terraserver developers have seen the light of making interfaces to
programs openly available over the Web, and they provide several web ser-
vice interfaces, including a Web Map Service, several WSDL interfaces, and
an API for the .NET framework. Learn more about what’s available at http://
www.terraserver-usa.com/webservices.aspx. For an example of what can be
quickly hacked together with the Terraserver WMS interface, check out http:
//hobu.biz/ and type your address into the “geocode” box on the bottom
right. This hack uses a smidgen of python to glue http://geocoder.us/ and
Terraserver together.
Figure 1-6. Aerial ...
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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.