Tag Archives: ArcGIS Online

What is orthorectified imagery?

Using elevation to enable accurate image georeferencing

Imagery has an amazing amount of information, but raw aerial or satellite imagery cannot be used in a GIS until it has been processed such that all pixels are in an accurate (x,y) position on the ground. Photogrammetry is a discipline, developed over many decades, for processing imagery to generate accurately georeferenced images, referred to as orthorectified images (or sometimes simply orthoimages). Orthorectified images have been processed to apply corrections for optical distortions from the sensor system, and apparent changes in the position of ground objects caused by the perspective of the sensor view angle and ground terrain.

A view captured from an oblique angle (for example, 25°, left) must be corrected for relief displacement caused by terrain to generate the orthorectified view (looking straight down, right). Orthoimagery is produced by calculating the nadir view for every pixel.

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New Orleans at Esri UC – a Behind the Scenes Look and Repeatable Solutions

This year the City of New Orleans showcased their great work at the Esri User Conference Plenary. A major theme of their presentation was citizen engagement and creating a real two-way engagement enabling citizens to take in civic responsibility. New Orleans is doing outstanding work, and all of the solutions are configurations that can be repeated for any local government.

The first demonstration was the Property Survey solution in which we have enlisted User Conference attendees to help survey their properties for blight at https://propertysurvey.nola.gov/photosurvey/ This solution can be useful for a variety of applications such as code enforcement, emergency management assessment or tax appraisers. The Photo Survey Solution from the Esri Solutions gallery will allow you to process geo-tagged photos and an application to set up randomized surveys as New Orleans has done. Since 16,000 UC attendees were enlisted to help assess properties and shared on social media, Esri Managed Services was used to make sure the underlying infrastructure was ready for reliability and scalability.

New Orleans Property Survey

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What Makes an Enterprise GIS Successful?

As the 2016 Esri User Conference approaches, I have been thinking about the essence of what makes an enterprise GIS successful and offer these thoughts…

A successful GIS implementation requires more than just technology. Whether or not a GIS is successful, largely depends upon motivated people that are committed to managing change, and effectively applying the technology in a sustainable manner, while following best practices. An assistant City Manager once told me, “…whether or not our GIS implementation is successful is not a technology problem, it’s a people problem…”

Two of the key elements of a successful GIS are vision and leadership – if you are a GIS Manager, you need to be more than just a manager, you need to be a leader in your organization. You need to awaken your organization, and the public, to the capabilities and benefits of the use of GIS. This means you need to market the benefits of GIS to colleagues and the public. Let them know that GIS can do more than make maps, that it can be used easily by anyone, and that spatial analysis can provide insight that is not accessible with any other technology. This critical insight can help anyone make better decisions, be more efficient, and therefore, save money and time.

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The Expansive Reach of Web GIS

Across organizations and beyond

The geographic organizing aspect of GIS has been part of GIS thinking from the beginning, but now factor in the impact of the web. The new Web GIS provides an online infrastructure for making maps and geographic information available throughout an organization, across a community, and openly on the web. This new vision for Web GIS fully complements, integrates, and extends the work of existing GIS professionals.

Web access to data layers is straightforward: every layer has a web address (a URL) making it easy to locate and share online. And since every layer is geo-referenced, Web GIS becomes an engine of integration that facilitates the access and recombination of layers from multiple providers into your own apps.

This is significant. Millions of professionals in the GIS community worldwide are building layers that serve their individual purposes. By simply building and then sharing these layers back into the GIS ecosystem, they are adding to a comprehensive and growing GIS of the world. Each day, this resource grows richer and is tapped by ArcGIS users and shared on the web. Web GIS truly has become “the nervous system of the planet.”

Web GIS extends the reach of the work of GIS professionals to others inside of their organization and to their constituents and beyond.

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Web GIS, Simply

I’m often speaking about, demonstrating, writing about, or using Web GIS. And I’m frequently asked things like “What exactly is Web GIS?” and “Why is Web GIS important to me?” To answer these and other common questions, here’s how I describe Web GIS, simply.

What is Web GIS?

Simply put, Web GIS is a pattern, or architectural approach, for implementing a modern GIS. It’s powered by web services—standard services that deliver data and capabilities, and connect components.

Web GIS can be implemented in the cloud (using ArcGIS Online), on-premises (using ArcGIS Server), or more typically as a hybrid combination, leveraging the best of both worlds.

Web GIS isn’t new, in fact it’s been evolving for a long while. But we’ve reached, actually passed, a tipping point where innovation in GIS and related technologies have made Web GIS not only possible, but essential.

Web GIS has been evolving for a long while, and has been influenced by innovation in many areas.

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What Runs Behind the Scenes at the Boston Marathon

By Jessica Wyland

Runners (and race fans) take your mark. Today is the 2016 Boston Marathon, held every April on the Massachusetts holiday Patriots’ Day, which commemorates the start of the American Revolutionary War. It’s a spirited race, one that attracts about 30,000 runners, half a million spectators, and international media coverage.

Amid all the excitement, and new shoes, lurk safety concerns.

Take yourself back to spring 2013, the 117th running of the Boston Marathon. That day two bombs exploded at the finish line killing three people and wounding 260.

The following year marked record-high participation from runners and spectators under the rally cry: Boston Strong. By 2015, the Massachusetts Emergency Management Agency had produced the Boston Marathon Dashboard, an online map that tracks every aspect of the event as it happens.

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Living Atlas Resources for Earth Science Week and Beyond

Bioclimates in and around the Eastern Himalayas

It is Earth Science Week! Since October 1998, the American Geosciences Institute has organized this national and international event to help the public gain appreciation and understanding of Earth Sciences and to encourage stewardship of the Earth. We want to … Continue reading

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Map Gives New Insights into Global Population

Esri’s World Population Estimate, a new probability surface that estimates the location and count of people throughout the world, is now available in ArcGIS Online.

Esri has been producing a global population estimate in ArcGIS Online for several years. This data is in the form of point features with population counts and characteristics assigned to each point; and it is used behind the scenes in apps such as Business Analyst Online, Community Analyst, and Esri Maps Apps. That may sound simple, but those points are big data; with nearly a billion locations represented. The Geographic Data Enrichment tools depend on those points as the basis for describing the characteristics of local populations in countries lacking a census or countries that do not make detailed census data available.

World Population Estimate map for Jakarta, Indonesia.

Based on this earlier point data work, Esri released the World Population Estimate (WPE) in December 2014. WPE takes the form of a raster surface, which is far easier to make available in ArcGIS Online and use in analysis models than the previous point data. Continue reading

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Speaking the “Language” of Spatial Analysis via Story Maps

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Last update: July 6, 2016 Spatial analysis has always been a hallmark of GIS, the “numerical recipes” which set GIS apart from other forms of computerized visualization and information management. With GIS we can pose questions and derive results using … Continue reading

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Story Maps for “Bread and Butter” Applications

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Story Maps are fun, easy, and informative. Their popularity is documented by the many interesting examples you will find at the Story Maps Gallery. An enduring favorite of mine is not the most sophisticated, or provocative, or one that required … Continue reading

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