Google Maps API 3

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CHAPTER 9 ■ DEALING WITH MASSIVE NUMBERS OF MARKERS Figure 9-1. Ten markers is no problem, but even when we increase the number to 50, there's a risk of overlap. Figure 9-2. Probably 100 markers is really unusable...not to mention 1,000 markers. Generally speaking, if you’re using fewer than 100 markers, you rarely have a problem. But if you have more, you have to ask yourself these questions: • Is the map slow? • Is it hard to get an overview of the map because of all markers? • Is it hard to make sense of the data being shown on the map? If the answer is no to all of these questions, you probably don’t have a problem. But if the answer is yes to any of them, you probably have to think about how to improve the way you’re visualizing the data. 178
CHAPTER 9 ■ DEALING WITH MASSIVE NUMBERS OF MARKERS Reducing the Number of Markers Being Displayed One obvious way of to get around this problem is to not display all the markers all the time. Before getting into how to code actual solutions to this problem, I’ll explain some possible approaches for reducing the number of markers being shown. Since v3 is still in beta at the time of writing this book, I’ve had problems finding relevant examples implemented with v3. So, the examples shown here are implemented using Google Maps API v2. These concepts can, however, just as well be implemented using v3. Also, since most of these solutions involve server-side coding, which is beyond the scope of this book, I’m not going to get into how to actually implement them. Let these first examples just serve as inspiration for how you can approach the too-many-markers problem. Searching One way of reducing the number of markers being displayed is to provide a search function. This way, even if you have thousands of locations, only the ones that match the search criteria are visible. One example of this is the search function in Google Maps. If you search for Starbucks, it will only display the Starbucks available in the visible map (see Figure 9-3). Figure 9-3. maps.google.com features a search function that searches the visible map and adds markers of the locations found. 179
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THE EXPERT’S VOICE ® IN WEB DEVE
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Beginning Google Maps API 3 Copyrig
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Contents at a Glance Contents......
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■ CONTENTS Creating a Map .......
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■ CONTENTS Automatically Adjustin
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■ CONTENTS ■ Chapter 8: Creatin
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■ CONTENTS MapCanvasProjection Ob
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About the Technical Reviewer ■ Ro
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Introduction This book started out
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CHAPTER 1 ■ INTRODUCING THE GOOGL
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CHAPTER 2 ■ TRANSFERRING FROM VER
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C H A P T E R 3 ■ ■ ■ Creatin
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CHAPTER 3 ■ CREATING YOUR FIRST M
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CHAPTER 4 ■ TAKING THE MAP FURTHE
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CHAPTER 5 ■ X MARKS THE SPOT Figu
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CHAPTER 5 ■ X MARKS THE SPOT List
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CHAPTER 5 ■ X MARKS THE SPOT Addi
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CHAPTER 5 ■ X MARKS THE SPOT What
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CHAPTER 5 ■ X MARKS THE SPOT List
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CHAPTER 6 ■ MARKER ICONS Changing
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CHAPTER 6 ■ MARKER ICONS Figure 6
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CHAPTER 6 ■ MARKER ICONS ■ Note
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CHAPTER 6 ■ MARKER ICONS Using Sp
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CHAPTER 6 ■ MARKER ICONS Origin t
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CHAPTER 6 ■ MARKER ICONS Google M
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CHAPTER 6 ■ MARKER ICONS Defining
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CHAPTER 6 ■ MARKER ICONS A Clever
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CHAPTER 6 ■ MARKER ICONS Adding D
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CHAPTER 10 ■ LOCATION, LOCATION,
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APPENDIX ■ API REFERENCE The Name
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APPENDIX ■ API REFERENCE Method R
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APPENDIX ■ API REFERENCE MapOptio
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APPENDIX ■ API REFERENCE Constant
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APPENDIX ■ API REFERENCE ScaleCon
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APPENDIX ■ API REFERENCE MapPanes
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APPENDIX ■ API REFERENCE Table A-
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APPENDIX ■ API REFERENCE Event Ar
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APPENDIX ■ API REFERENCE Property
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APPENDIX ■ API REFERENCE Geocoder
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APPENDIX ■ API REFERENCE LatLng C
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APPENDIX ■ API REFERENCE Method R
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APPENDIX ■ API REFERENCE MVCObjec
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• • • Index •A addDomListen
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•INDEX latency, 111 limits on dow
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•INDEX prime meridian, 4 x proper
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•INDEX addListener() see addListe
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•INDEX building address lookup we
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•INDEX handleError function build
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•INDEX size of, 137 v2/v3 compare
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•INDEX creating zoom-in link in I
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•INDEX adding rich content to Inf
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•INDEX maxZoom property, 209 mini
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•INDEX Map object, 247 Marker cla
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•INDEX creating donuts, 170 fillC
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•INDEX MapTypeId class, 51, 52, 2
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•INDEX src attribute, video eleme
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•INDEX streetViewControl, 59—61
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Google Maps API 3

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