ArcGIS Web Development by Rene Rubalcava

By Rene Rubalcava

ArcGIS net improvement is an example-rich consultant that teaches you to take advantage of the ArcGIS JavaScript API to construct customized GIS internet functions. The ebook starts with easy-to-follow examples that introduce readers to the ArcGIS JavaScript API and exhibit how one can observe uncomplicated customizations. because the booklet progresses, you will discover a full-scale, web-mapping program. through the top it is possible for you to to construct net apps that experience positive factors you would in most cases look forward to finding simply in committed GIS functions. Written for net builders acquainted with JavaScript and simple GIS innovations. adventure with ArcGIS is beneficial, yet now not useful.

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You’ll complete the following steps: ■ ■ ■ Instantiate your map and create a SimpleMarkerSymbol to define the appearance of the results of your QueryTask. Create two functions. One is used for the successful completion of a query, and the other is used, in the event of an error, to display the error message in the debug console of the browser. When a population number is selected from the drop-down menu, create a new QueryTask pointing to the URL of a map service, which in this case is a service that contains the census tracts as points.

12). I’ll cover Base64-encoded image data in the next chapter. 12, this is a large amount of data for the map to display. Too much data can significantly impact the performance of your application. In this case, even though this image is fairly small, the browser still uses up memory to draw it on the screen. 3 Optimizing application performance To manage your application’s performance, you can set different modes for the FeatureLayer: ■ MODE_SNAPSHOT—Retrieves all data from the service and displays it on the ■ map.

The API reference pages can save you time when you’re stuck on how to work with a certain module. Esri, the company that supplies the ArcGIS API for JavaScript, also provides a collection of samples on its website that do a good job of introducing users to the basics of the API and some tools. com/js, as required reading along with this book. Now for the moment you’ve been waiting for: you’re going to dive right in and make a bare-bones mapping application. Get ready for it! 1 From data to map A map is a way to visualize data.

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ArcGIS Web Development by Rene Rubalcava
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