Monthly Archives: February 2011

Next update to ArcGIS Explorer Online coming soon

In a few days, Esri will release the next update to ArcGIS Explorer Online which includes an all new streamlined user experience with new capabilities and better integration with other ArcGIS applications. In this sneak peek video, Andy MacDonald from the ArcGIS Explorer Online team gives a preview of what you’ll see in this update.



Posted in ArcGIS Online, Services | Tagged , , , | Leave a comment

Hydrography Event Management Tool for ArcGIS 10

National Hydrography Dataset






The Hydrography Event Management (HEM) Tool Version 2.4 for ArcGIS 10 is now available!

The HEM Tool provides full functionality for adding and editing events in the National Hydrography Dataset (NHD).

Events are informational data linked to the NHD using a linear
referencing system on NHDFlowlines.  The use of events allows vast
amounts of scientific information to be linked to the NHD.

The HEM tool handles all linear referencing mechanics to make working with events easy.  It works on point, line, and area events and allows events to be located interactively, imported, or calculated.

A number of state and federal partners have adopted HEM: Environmental Protection Agency (EPA) incorporated HEM to meet Clean Water Act reporting requirements, the U.S. Forest Service incorporated HEM functionality into their National Resource Information System (NRIS) Aquatic Surveys application, Bureau of Land Management (BLM) incorporated HEM to support event creation for its Oregon/Washington Aquatic Resource Information Management System
and is evaluating its use for a national Riparian Database, and the HEM
Tool is used to georeference water quality data to the NHD, and this
information is then used for Section 303(d) water quality reports on impaired waters.

HEM effort is a unique collaboration between the BLM, U.S. Geological
Survey (USGS), and the EPA that results in ongoing tool development and
support to the expanding HEM user community.

The USGS provides basic to advanced HEM training with easy to follow exercises:

and additional user support in the Troubleshooting Guide.

OR you can request training and support on a specific HEM topic.

To find out more information visit USGS’s HEM site.

NHD Tools



Special thanks to Ariel Bates for providing the post. Questions for Ariel:

Posted in Hydro, Migrate | Tagged , , , , , , , | 2 Comments

Shadow Maps


At ArcGIS 10, we introduced the ability to create Volumetric Shadows over time. This allows you to visualize for example the shadow effect of a proposed building on neighboring buildings.


Visualization of shadows is important but the real power of ArcGIS shines in the ability to use these shadow volumes in 3D analysis workflows.

One example of a such a 3D analysis workflow is the creation of a so-called shadow map. This is a map showing areas of shadow / no shadow on a horizontal plane (ground) at a certain point in time.


And when we calculate a shadow map for a number of time steps and summarize, we get a good indication of the shadow effect on the horizontal plane (ground) over the course of the chosen time period.




Landscape planners might use these maps to decide where to plant certain plant species so they get enough sunlight or where to place park benches so they get enough shade in summer.

Have a look at the Shadow Map video to see it all in action.

We’ll publish a shadow map template soon here on the 3DGIS resource center so you can see how it is all done.

Gert van Maren

3D Product Manager


Posted in 3D GIS | Tagged , , , , | 1 Comment

DEM resolution, output map pixel density, and largest appropriate map scale

By Dr. A Jon Kimerling, Professor Emeritus, Oregon State University

DEM thumbnail

If you’ve used any raster DEM data to make maps you may have at one time or another asked yourself, “What is the appropriate map scale for the DEM I am using to make the map?” This question is tied closely to a basic principle of map compilation that you may have learned in your beginning cartography course: “Always compile your map from source materials of the same or larger map scales”. In our age of digital elevation models and other raster datasets, this basic principle of map compilation can be restated as: “Always create your raster map from data at the same or higher spatial resolution than the ground resolution of your map display grid cells”. The ground resolution of your map display grid cells will depend on the scale of your map. An equation you can use that relates map scale expressed as a representative fraction (1/x), DEM cell resolution, and map display resolution is:

Continue reading

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Come meet the Raster team at the 2011 Developer Summitt

This year’s Developer Summitt will take place from March 7th to March 10th at the Palm Springs Convention Center.
        More information about the 2011 Developer Summitt
        View the Agenda

Come by and meet the members of the Raster Team, whether you have a question, or just want to meet some of the team. There are several way to meet us: you can come by the Showcase Area, you can attend our Technical Workshop, you can attend our Demo Theaters, or you can join us at the Meet the Team event. 

Esri Showcase
The Raster team will be located at the Desktop Island and also at the Server Island. 
The Esri Showcase has the following hours:
Mon      11:00 a.m.–7:00 p.m.
Tue       12:30 p.m.–6:00 p.m.
Wed      10:00 a.m.–6:00 p.m.

Technical Workshop
Working with Image Services    
Thursday March 10th 8:30am
Catalina/Madera (Renaissance Hotel)

Demo Theater
Using Mosaic Datasets to Manage Imagery
Tuesday March 8th 2:00pm
Demo Theater 1 – Oasis 1 (Palm Springs Convention Center)

Developing and Extending ArcGIS Raster Capabilities
Tuesday March 8th 5:00pm
Demo Theater 1 – Oasis 1 (Palm Springs Convention Center)

Meet the Teams
Tuesday March 8th 6:00 p.m.– 8:00 p.m.
by the pool


Submitted by: Melanie Harlow


Posted in Developer, Imagery | Tagged , , , | Leave a comment

Background Geoprocessing and Spatial Statistics

When it comes to the Spatial Statistics tools in Version 10.0, there are a couple of things that you need to keep in mind when using background geoprocessing.  Many of the Spatial Statistics tools have textual output that can be viewed from the progress dialog box and the Results window when the tools are run in the foreground.   When the tools are run in the background, you must rely on the Results Window to give you all of that important information (and save it for future use). 

Let’s use the Spatial Autocorrelation (Moran’s I) tool as an example.  The Spatial Autocorrelation tool returns five values: the Moran’s I Index, Expected Index, Variance, z-score, and p-value.  These values are accessible from the Results window and are also passed as derived output values for potential use in models or scripts.  Right-clicking on the Messages entry in the Results window and selecting View will display the results in a Message dialog box (as illustrated below).  If you execute this tool in the foreground, output values will also be displayed in the progress dialog box.


     Optionally, the Spatial Autocorrelation tool will create an HTML file with a graphical summary of the results.  In previous versions, you could choose to have a graphic pop up tell you whether your results are clustered, random, or dispersed.  A similar graphic summary of your results is still available, but now it is actually saved as an HTML output.  This will help us as we share and review our findings in the future.  Double-clicking on the HTML file in the Results window will open the HTML file in your default Internet browser.


     Also keep in mind that if you are running model tools that you created in ModelBuilder, you will have to make sure that you set the output files (like HTML pages) as Model Parameters.  That way they will show up in the Results window.

     So, make sure that you remember how important the Results window is for many of the Spatial Statistics tools!  And for more resources on using the Spatial Statistics tools, check out our resources page at

Posted in Analysis & Geoprocessing | Tagged , | Leave a comment

ArcGIS API for iOS v1.8 Beta is live!

The iOS development team has just released an open, public beta for the next release of the ArcGIS API for iOS. It is available for download from our beta community site now! Sign up for the ArcGIS Beta Community at and click on the “ArcGIS API for iOS” link to join!

The 1.8 beta release builds upon the success of our 1.0 release and introduces the following new capabilities:

  • a Sketch layer to easily create and edit geometries
  • a magnifier for the map
  • a high-performance, native, Geometry Engine to perform sophisticated geometric operations locally on the device
  • support for web maps
  • a new Route Task to generate point-to-point routes and driving directions using Network Analyst services.
  • support for map to wrap around the dateline
  • enhanced callout customization including the ability to display custom views in the callout
  • much more…

We are looking forward to having you join our beta program and more importantly using the ArcGIS API to build new and exciting applications for the iPhone, iPad, and iPod Touch devices!

Mobile Team

Posted in Mobile | Tagged , , , , , | 1 Comment

Join Adobe Developer Evangelist Kevin Hoyt at the DevSummit

Flex Developers take note! Kevin Hoyt, Adobe Developer Evangelist, will be presenting on a timely topic: Mobile development with Adobe Flash. Kevin has presented at both the DevSummit and the Esri User Conference before and he always has great content, so make sure you at least stop by and introduce yourself.

Kevin tells us that he’s going to be “…talking about why developers should be interested in deploying across multiple screen types in the first place, as well as looking at the constraints and factors that developers should consider.” He’s also including a series of concrete examples of taking geo data and putting it on a few different screens.

Title: Maps on Screens…Everywhere

When: Tuesday, 5pm, Demo Theater 2, Oasis 1

Here’s the session description:

It used to be simple – build for the desktop. That might mean as a native application, or in the browser, but historically, that has presented a fairly concise set of requirements. Times they are a changing however, and now you have to think about smartphones, tablets, and even televisions – each with their own display resolutions, input methods, and processing constraints. In this session, you will see firsthand how to deploy to each of these form factors. Along the way, get an introduction to user experience design considerations for the multi-screen revolution.


- EDN Team

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Defense and Intelligence workshop at the 2011 Esri Developer Summit


The ArcGIS for Defense and Intelligence team will be at the 2011 Esri Developer Summit this March 7th to 10th in Palm Springs, CA. On Thursday we will be presenting a technical workshop showing what is available to developers and what is coming next.

What: ArcGIS for Defense/Intel – A Developer’s Guide
When: Thursday, March 10, 2011, 8:30am-9:45am
Where: Palm Springs Convention Center, Mesquite GH
Description: Developers can build defense and intelligence products and solutions using the ArcGIS software stack. The focus of this session will be on demonstrating how to leverage key elements of ArcGIS to develop focused defense and intelligence applications. Topics of this session will include real-world examples of constructing military features, building planning and intelligence templates, and creating a situation awareness Web application. Patterns, frameworks, and practices that will help defense and intelligence developers easily build, test, and maintain applications will be discussed.

Prerequisites: ArcObjects, .NET experience

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Public Safety Common Operational Picture Template v. 2.2 Released

The February 7, 2011 release of the Public Safety Common Operational Picture template for ArcGIS 10 addresses the following:

New Functionality

1. Added support for the ArcGIS Viewer for Flex 2.2

2. Added support for the dynamic Legend Widget and removed the static Legend contained in About link

3. Updated symbology for incident point, line and polygon features

4. Added a custom pop up widget to display feature information (aliases, field formatting, etc.)

5. Converted imagery hybrid basemap in to a web map that now includes the World Imagery ArcGIS Online service and a reference overlay from the local government geodatabase

Resolved Problems


Known Issues


Also note that a video on How to use the Public Safety COP Template for ArcGIS 10 has been posted to the Local Government Video Gallery.

Posted in Public Safety | Tagged , , , , , | 1 Comment