Hacking Google Maps and Google Earth (ExtremeTech)

Chapter 9 — Using Overlays 175 } elsif(param(‘m’) eq ‘getmarkers’) { getmarkers(param(‘city’)); } sub citylist { my $sth = $dbh- ...

176 Part III — Google Map Hacks There are two elements here, both in separate functions. The citylist()function uses a SQL state ...

Chapter 9 — Using Overlays 177 FIGURE9-7: Restaurants in Ambleside. Finally, clicking a marker or restaurant name shows the info ...

178 Part III — Google Map Hacks FIGURE9-8: Sheila’s Cottage in Ambleside. FIGURE9-9: Going back to a list of cities. ...

Chapter 9 — Using Overlays 179 Wrapping Up As you have seen in this chapter it is the combination of the JavaScript, dynamic dat ...

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Overlaying Statistical Data W ith a map and some appropriate geographical information, you can plot statistical information (tha ...

182 Part III — Google Map Hacks The U.S. Census Data For the examples in this chapter the population of different cities in the ...

Chapter 10: Overlaying Statistical Data !/usr/bin/perl -w use strict; open(DATA,$ARGV[0]) or die “Couldn’t open file; did you fo ...

184 Part III — Google Map Hacks <city title=”Los Angeles, Calif.” lat=”34.052220” lng=”-118.242780”> <pop year=”2004” v ...

Chapter 10 — Overlaying Statistical Data 185 XML document, picking out the city information, latitude and longitude of each city ...

186 Part III — Google Map Hacks Centering and Deciding on a Zoom Level One of the problems with any map is ensuring that the vie ...

Chapter 10 — Overlaying Statistical Data 187 var newlng = lngpoints[0] + ((lngpoints[lngpoints.length-1] - ; lngpoints[0])/2); v ...

188 Part III — Google Map Hacks FIGURE10-1: A simple city marker map. Building an Internal Data Representation Before the statis ...

Chapter 10 — Overlaying Statistical Data 189 Now the population data can be extracted from the XML. A separate associative array ...

190 Part III — Google Map Hacks To keep the height of each bar consistent, you need a baseline to work from. Using a percent- ag ...

Chapter 10 — Overlaying Statistical Data 191 pointpair.push(new GPoint(points[i].x, secondlat)); var line = new GPolyline(pointp ...

192 Part III — Google Map Hacks FIGURE10-3: A close up of California population data for 2000. Adding a Circle Polylines, by the ...

Chapter 10 — Overlaying Statistical Data 193 } addmarker(points[i].x,points[i].y,titles[i] + ‘: ‘ + popdata[i][year]); } for(var ...

194 Part III — Google Map Hacks FIGURE10-5: California’s population data. Plotting Multiple Data Sets An alternative to plotting ...