STAC: Creating an Ecosystem of SpatioTemporal Assets — Azavea

The SpatioTemporal Catalog (STAC) is an open standard for exchanging catalogs of raster and vector data. The goal of the standard is to increase “ the interoperability of searching for satellite imagery.” The potential applications of the analysis of satellite imagery are far-reaching. Yet, few are engaging with the multitude of data available.

A major impediment is the difficulty of searching and working with the data-the variety of formats and descriptions can flummox even the most experienced of users.


Join STAC Sprint #5 + OGC API — Features hackathon November 5–7

The past couple of years has seen some major steps forward on geospatial interoperability. The trend in OGC towards open collaboration, JSON + REST focus, and OpenAPI specs that started with WFS 3 is sweeping through most all the core specifications. They recently held a successful hackathon, which resulted in agreement on the core ‘building blocks’ that form the ‘OGC API,’ with WFS 3 evolving to become the ‘OGC API — Features’ specification. As the core pieces settle, there is still lots of interesting work happening with the spec, in extensions that enable implementors to match the functionality of previous WFS versions, like Filters, advanced Queries, reprojection, transactions and more.

Community Voices

Hamed Alemohammad: Addressing global challenges with models that are faster

It is our pleasure to introduce Dr. Hamed Alemohammad, Chief Data Scientist with Radiant Earth Foundation. Dr. Alemohammad is a technical leader and researcher with extensive expertise and knowledge in remote sensing and imagery techniques, and statistical and machine learning models for geospatial and big data analytics. With a proven record of developing new algorithms for multi-spectral satellite and airborne observations and analyzing them to infer actionable insights, he is spearheading Radiant MLHub’s open repository of Earth observation training data and ML models.

Radiant MLHub is democratizing ML data and models, and, diversifying EO applications. At its core, Radiant MLHub provides an open source “Hub” for discovery and access of thematic training data and models, which are necessary to innovate for sustainable development globally.


Exploiting Multi-Region Data Locality with Lambda@Edge


Dreams do come true: STAC Sprint #4 Recap

A couple of weeks ago, the core SpatioTemporal Asset Catalog (STAC) community gathered in San Francisco (and virtually) to advance the ecosystem and specification, in our fourth in-person sprint. We decided to focus more on the tools and data this time, dedicating the first day to building catalogs and software. Since the start of STAC, there have been two milestones that I’ve been dreaming of — a QGIS plugin and an interactive Javascript image browser; and amazingly, we had huge progress on both, which are now available for everyone.

Machine Learning

Refocusing Radiant Earth Foundation’s Efforts to Impact Global Development with Machine Learning

Data drives decisions. Whether it’s the number on a scale signaling the need to diet or a satellite image showing the extent of flooding for disaster response, data, imagery, and the resulting analyses they enable guide valuable insights and actions.

Radiant Earth Foundation was founded on the premise that much of the world’s best data and imagery was difficult to find and even more difficult to use because of access issues, making these valuable assets stranded and underutilized.

Tech Innovation

STAC 0.7.0 Release and New Website

Chris Holmes is pleased to share two pieces of news about the SpatioTemporal Asset Catalogs Spec. The first is that we now have a website! The goal of the website is to be a much more approachable set of explanations than the specification itself. Having the specification live on GitHub was done on purpose to make it more accessible to developers, but it can be intimidating to non-developers. Putting up the website is indeed a milestone, signaling that STAC is maturing enough to welcome a wider audience.

A big thanks goes to David Gavin of Digital Earth Australia for doing all the initial website copy and styling at the 3rd STAC Sprint, with his ‘outreach’ group. We are hoping to have another outreach group do comparable tasks at the 4th Sprint, though the group at the last sprint set a very high bar.

Thought Leadership

Geo-Diverse Open Training Data as a Global Public Good

As part of the Amazon Sustainability Data Initiative, Hamed Alemohammad, Chief Data Scientist at Radiant Earth was invited to share how the organization is using open data and the Amazon Web Services (AWS) Cloud to support the global development community.

Machine learning in support of the SDGs
To effectively leverage open EO data and analytics in support of the SDGs, we turn raw EO data into insights that can guide the decisions required to create a sustainable future. Machine learning is an important part of that process but has one major drawback – the lack of geo-diverse training datasets. Radiant Earth is actively working to fill that gap.

Tech Innovation

Join STAC Sprint #4!

Things have been moving along well in the SpatioTemporal Asset Catalog community, but we’ve decided it’s been far too long since our last sprint. While STAC is primarily an online collaboration, the in-person sprints are where we’ve always made our most substantial progress. After our initial inception at a sprint in Boulder, we paired our next two sprints with other groups — the second with WFS 3.0, and the third with Analysis Ready Data. It was great to have the interchange between related groups, but for this sprint, we’ve decided to make it all about STAC.