Google Maps API 3

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CHAPTER 9 ■ DEALING WITH MASSIVE NUMBERS OF MARKERS Also notice that the markers are displayed with labels that correspond to the search result to the left of the map. This is a great way to enhance the maps usability since it makes it possible to understand which marker is which. Filtering Another way of reducing the number of markers displayed on the map is by offering a filtering function. STF (which is a Swedish Tourist Association with more than 400 hostels, mountain stations, and alpine huts) offers a map where you can find all of their accommodations as well as other things to see and do (see Figure 9-4). To make the map easier to use, they provide a filter function with which you can filter the map. This is done by marking options in the filter area to the left of the map. Figure 9-4. STF offers a map that enables you to filter what is shown on the map by marking items in the filter area to the left of the map. The map is found at http://tinyurl.com/36ug6jw. STF is also utilizing another great way of increasing the usability of the map, and that is by having different marker icons for different types of locations. This technique alone makes scanning the map a lot easier. 180
CHAPTER 9 ■ DEALING WITH MASSIVE NUMBERS OF MARKERS Don’t Always Use Markers This might sound like a no-brainer, but sometimes we get so focused on using markers for everything that we forget that we have other tools at our disposal. Don’t forget that we also have polylines and polygons in our toolbox. If the thing you want to mark in the map is a road stretch or an area, use polylines or polygons instead. They are much better suited for the job. Clustering A common solution for handling the lots-of-markers-problem is to cluster them. What this means is that instead of displaying each individual marker at each time, clusters of markers are displayed. When you zoom in on a cluster, it will break up into smaller clusters or in individual markers. Using a cluster will significantly increase the performance of the map as well as making it easier to understand (see Figure 9-5). Figure 9-5. The difference between displaying 1,000 markers on a small map and using clusters to do it Grid-Based Clustering Grid-based clustering is probably the most common approach for clustering markers. It will divide the map into a grid and group all markers within each square into a cluster. Although an efficient technique, it has some obvious limitations since it can lead to unwanted results. Two markers that are really close together but in separate squares will, for example, not be grouped into the same cluster. See Figure 9-6. 181
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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 Figu
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CHAPTER 5 ■ X MARKS THE SPOT List
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CHAPTER 5 ■ X MARKS THE SPOT A Si
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CHAPTER 5 ■ X MARKS THE SPOT coul
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CHAPTER 5 ■ X MARKS THE SPOT The
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CHAPTER 5 ■ X MARKS THE SPOT }; }
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CHAPTER 5 ■ X MARKS THE SPOT Addi
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CHAPTER 5 ■ X MARKS THE SPOT Nest
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CHAPTER 5 ■ X MARKS THE SPOT for
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CHAPTER 5 ■ X MARKS THE SPOT What
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CHAPTER 5 ■ X MARKS THE SPOT Auto
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CHAPTER 5 ■ X MARKS THE SPOT List
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CHAPTER 5 ■ X MARKS THE SPOT }; }
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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 6 ■ MARKER ICONS Benefits
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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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