Version 1.2 of the ArcGIS JavaScript API released

Version 1.2 of the ArcGIS JavaScript API is now available! You can begin referencing it in your code with this tag:

<script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.2"></script>

This release corresponds with the release of ArcGIS Server 9.3 Service Pack 1. However, the ArcGIS JavaScript API 1.2 can work with services from both ArcGIS Server 9.3 Final and 9.3 SP1.

This post details some of the most important new features in the ArcGIS JavaScript API 1.2. You can also find various samples in the online SDK that demonstrate these features.

Support for Image Services

You can add ArcGIS Server Image Services to the map using ArcGISImageServiceLayer. Image services represent file-based raster datasets or raster collections published with the ArcGIS Server Image extension. You can control the image type, compression type for JPG, image bands, and interpolation type.

Support for Dojo 1.2.

When you reference the ArcGIS JavaScript API in your code, you also have access to version 1.2 of the Dojo Toolkit. See the Dojo 1.2 Release Notes for migration information and a full list of improvements.

More flexibility with cached and dynamic layers

You can now define which tile levels of a cached service are exposed in the map. For example, you may want to use ArcGIS Online data for small scales only, then switch to your own cached data at large scales. Or you may want to make a cached service available at large scales only in order to focus the map on a certain geographic area.

You can also force dynamic maps to conform to the scale levels in a tiling scheme. This allows you to show a cached map at small scales, then easily switch to a dynamic map at large scales.

Refreshable map layers

Map service layers have a refresh() method. This is useful if back-end editors are modifying the data and you want to ensure the end user of the application sees the most recent data from the server.

Improved graphics performance

The performance of the graphics layer is improved when adding a large number of graphics to the map.

Projection of dynamic map services on the fly

Dynamic map services can be projected on the fly to match the spatial reference you set for the map. Previously, the spatial reference was defined by the base layer. Now the map can be defined using any spatial reference. Valid only with dynamic map layers.

New methods for the geometry service

GeometryService has new methods that allow for creating points in polygons for labeling purposes, and determining spatial relations of geometries. These geometries do not have to come from a map service; they can be geometries returned from a task or a query to a non-ArcGIS Web service.

Bug fixes

The following bugs have been fixed in version 1.2:

  • NIM034356 Double-click zoom is a default navigation type for the JavaScript API at version 1.2.
  • NIM036958 Style Attributes (STYLE_DASHDOTDOT and STYLE_NULL) of SimpleLineSymbol now work as expected.
  • NIM036833 Graphic.attribute names that contain decimal points (mytable.area) can be used in an InfoWindow through the Graphic.InfoTemplate.

We’d be happy to read your feedback about version 1.2 as comments to this post.

Contributed by the ArcGIS JavaScript API Team

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Explorer, GIS Day, and Geography Awareness Week

Yesterday was GIS Day, and we’ve still got a couple of days left in Geography Awareness Week. About.com informs us that:

Geography Awareness Week was established in 1987 when U.S. President Ronald Reagan signed legislation that established the third week in November as Geography Awareness Week. Geography Awareness Week is sponsored by the National Geographic Society and other geographic organizations at the national, state, and local level.

We’ve received some screenshots and descriptions of Explorer being used on GIS Day and throughout this week. If you have more examples that you’d like to share, let us know by sending a screenshot and description via e-mail to arcgisexplorerblog@esri.com

This first example is from Adam Pittman, who prepared a presentation for the fourth grade class at Cambridge Elementary School in San Antonio, Texas. The students are learning about explorers of North America, and ArcGIS Explorer was used to look at the explorations of Coronado, Lewis & Clark, and LaSalle.

Here’s a screenshot of the Lewis & Clark exploration ending up at Fort Clatsop, Oregon, where Capt. William Clark wrote in his journal “Ocian in view! O! the joy.” While they weren’t quite at the ocean, they were close, having reached the Columbia River estuary. Various camps are shown along the route.

Coronado travelled up from Mexico, heading to the Grand Canyon and then heading east through Texas and up to Kansas. He stopped just outside Lindsborg, Kansas, erecting a small fort on top of a hill, shown below. The fort has been rebuilt and can be seen in Explorer’s default map.

GIS tools were used to analyze terrain and view other layers of information that could have helped these early explorers, like weather, topography, vegetation, and others.

And Ray Carnes presented at the Highland (California) Library and Environmental Learning Center as part of a “See Highland Through Maps” GIS Day exhibit. Shown below is a part of the city with average household income information. Images like these helped visitors understand the characteristics of their local community.

 

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ArcGIS Developer Poll Results – The Visual Studio version winner is…

Of the individuals that participated, it’s clear that Visual Studio 2005 with .NET 2.0 is the most popular IDE for ArcObjects development today.  50% of the community are developing with this configuration.  The next most popular configuration is Visual Studio 2008 with .NET 3.5 at 32%.

A smaller percentage are taking advantage of the Visual Studio 2008 IDE improvements, but still building on top of the .NET 2.0 framework. This is surprising given that .NET 3.0 and 3.5 didn’t undergo any major architectural changes (still uses the .NET 2.0 CLR) and are considered an additive release.  We would be interested in hearing more feedback about this!

There are limitations, but another interesting fact was that very few (2%) of the respondents identified that they were using Visual Studio Express.  And of course, there are still a few (3%) implementing Visual Studio 6.0.

On that note, for all VB6 and VBA developers looking to transition to .NET, we are releasing a number blogs and videos on the migration process very soon.  Keep your eyes posted.  

In the mean time, let’s turn to the Java developers in the next poll and see what IDE they are using.

Thanks for the feedback!

 

 

 

 

 

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Podcast on Migrating to the Geodatabase now available

To follow up on our last post, this is just a heads up to tell you that Derek Law’s podcast for Migrating to the Geodatabase is now online. The podcast talks about how to migrate existing data into the geodatabase. Derek goes over migration details for 5 of the more common data types: tables, shapefiles, CAD, coverages and imagery.

The podcast is intended for GIS managers and GIS analysts who are new to working with geodatabases and would like to learn more about how to convert and use their existing GIS data in a geodatabase.

If you are interested in hearing the podcast or reading the transcript, you can find both HERE

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Using ArcGIS Online via direct connection

The ArcGIS Explorer default map, and maps and layers you can discover on the Explorer Resource Center, are created using ArcGIS Online services. Behind the scenes these have been authored using ArcGIS Desktop, and are powered by ArcGIS Server.

We’ve chosen a subset of all of the available ArcGIS Online services to include on the Explorer Resource Center, but you can connect directly to ArcGIS Online and shop around for more. Here’s how…

Go to File > Open, and choose Servers. You’ll see a list of the available connections you can make across the top. Choose ArcGIS Server (since the ArcGIS Online services are ArcGIS Server based) and type the following connection URL:

http://services.arcgisonline.com/arcgis/services

You’ll see a list of all of the available services, many of them organized into folders.

 

At the bottom left of Open Content you’ll see a link to the Help on Opening Content that includes a legend describing the icons you’ll see:

Since Explorer is a globe, the globe services will be optimal. Many of the listed services are intended for use in ArcGIS Desktop, but any services you find will work just fine.

In this example, let’s click to open the NASA CloudCover_World, and choose Space:

 

We’ve just added a cloud cover layer to our map. There lots of content to choose from, so try browsing for others you may find of interest.

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Developing scriptable controls with the .NET Web ADF

A key consideration when designing a custom web control is where the control’s logic will execute. While all the logic could be put in either the client or the web tier, the best approach is usually to place some logic in each tier. User interface data and operations should usually be situated in the client tier, while data retrieval and heavy computational logic should (and often must) reside in the web tier. Distributing the control in this way maximizes the use of client resources and reduces server load.

Additionally, in order to minimize network traffic, client tier functionality should initiate server tier logic only when necessary (for example, to query a database housed in the web tier). Adhering to this architecture enables the development of controls with rich and responsive user interfaces.

Given the advantages of this architecture, the question becomes one of implementation. How can you efficiently create an implementation that is intuitive, maintainable, extensible, and re-distributable? One effective approach is to create a scriptable ASP.NET server control that inherits from the Web ADF WebControl.

Scriptable server controls offer a framework for combining server and client logic into one easily re-distributable control. This framework allows for the partitioning of client and server logic as described above while keeping that logic housed in one control and adherent to object-oriented programming standards. Furthermore, inheriting from the Web ADF WebControl will automatically package the Microsoft ASP.NET AJAX and Web ADF JavaScript Libraries with the control, making these available to client tier operations.

This is the approach we used when implementing the Web ADF controls, and we recently added a tutorial to the online help describing how to develop scriptable controls. The tutorial illustrates implementing a MapCoordinateDisplay control, which displays the current position of the mouse cursor over a buddied Map control.

Contributed by the ArcGIS Server .NET software development team

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The shakedown on the ShakeOut

Yesterday nearly 5 million Californians living near the San Andreas fault participated in an earthquake disaster preparedness drill called the ShakeOut, which we mentioned in our post yesterday. The earthquake scenario included a 7.8-magnitude earthquake along a 190-mile stretch of the fault starting at the Salton Sea and stretching northwest.

To understand the demographics of the most impacted areas in the scenario, we opened the USGS earthquake simulation shake intensity map (published as a KML) and added it to Explorer. Here’s the view of the quake intensity map looking north along the southern California Coast. The red areas are the areas with the highest predicted intensity.

We used the Business Reports task (powered by ESRI’s Business Analyst Online), available on the Explorer Resource Center, to delineate the boundary around the highest intensity areas. We used that boundary to generate the report, shown here:

The graphic demographic profile is the one we chose, and there are many different kinds of reports to choose from (some are free, some require a subscription). The report showed that over 6 million households are located in the high intensity area, roughly evenly distributed by age and income, with %50 of the owner occupied homes having a value greater than $400,000, and %40 having a value of greater than $500,000.

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Restricted color ramp

By Aileen Buckley, Mapping Center Lead

Trees

We recently got a question on Ask a Cartographer that related to the use of a restricted color ramp. The person asked, “Is there an easy way that I can make all the counties in one state variations on one hue, but each state a different colour so that the map readers can easily distinguish between states and counties?” The solution is a restricted color ramp and it can be used in many different situations. Continue reading

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World Street Map 3D service updated

11/14/08—The World Street Map 3D map service, ESRI_StreetMap_World, was updated on November 13 to
include more recent street data, enhanced cartography, and additional
coverage and levels of detail. Updates include:

  • Recent Tele Atlas data and AND mapping data for North America,
    Europe, and other areas.
  • Enhanced cartography (i.e., better hill shading, labeling, symbology,
    and colors).
  • Expanded coverage for international areas,
    including Eastern Europe, Southern Africa, and selected cities, such
    as, Ankara, Athens, Istanbul, Jakarta, Moscow, and St. Petersburg.
  • Additional level of detail for large parts of Europe and
    selected urban areas in North America, Europe, and elsewhere.

If you have previously used the ESRI_StreetMap_World
service may need to clear your map cache in order to see the updates.

How to clear the cache in ArcGIS Explorer:

  1. Click Tools > Options.
  2. Expand Cache and click Disk Cache.
  3. Under Cache Clean Up, select All Caches.
  4. Click the Delete Cache button, and click Yes to confirm. ArcGIS
    Explorer will need to restart as part of this process.

How to clear the cache in ArcGlobe:

  1. Right-click the service in the ArcGlobe table of contents.
  2. Click Refresh. It may take several seconds for the cache to be
    cleared.
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How to create a mobile application

Sabine Barrera is a senior product engineer on the ArcGIS Mobile development team. You may recognize her name from the many postings she has made to the mobile forums or you may have seen her in a recent webcast on ArcGIS Mobile 9.3.

Well Jim Barry from the EDN team caught up with Sabine and recorded a video wherein Sabine walks us through the 5 easy steps to creating a mobile application with the ArcGIS Mobile SDK and deploying it to either a Windows Mobile Device or an emulator.

Click on the picture of Sabine to watch the video…

 

Mobile Team

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