Advanced Methods for Geospatial Image Analysis

This blog brings you results of geospatial image analysis methods, data and meta-data visualization and analytics methods, digital cartography and GIS projects, satellite imagery and beyond. It is maintained by Georgios K. Ouzounis. The opinions expressed in posts by the author are not those of the author's employer and/or volunteer affiliations.

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Atlas of Human Settlements

Inland Empire, CA, 2023

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The Atlas of Human Settlements (AHS) v4.0 is just out!

AHS is built-up basemap of global extent, delivered at 10m spatial resolution and updated annually, with legacy layers going back to 2016. Version 4.0 features many quality improvements and additional raster and vector layers. Check it out in the official Atlas AI website at https://www.atlasai.co/ .

The images show the Built-up Index layer of major cities across the world.

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Today, March 15th, is known as the “Ides of March” and infamously marks the assassination of Roman leader Julius Caesar. Here’s a gallery of Rome Overviews, featuring:

The Roman Colosseum

Rome along the Tiber River

Balduina, a residential neighborhood

Prati, a neighborhood in central Rome

Source imagery: Bachir Moukarzel / Maxar

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Today's Overview captures the sprawling metropolitan area of Athens, Greece — home to over 3.7 million people and spanning nearly 3,000 square kilometers (1,131 sq mi). With ancient landmarks like the Acropolis and the Parthenon amid bustling city streets, Athens has a unique blend of history, culture and modernity. Some municipalities captured in this Overview include Egaleo, Pireas, Kallithea and Glyfada.

37.981779°, 23.727256°

Source imagery: Maxar

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Shaded relief map of the Cyclades islands.

by @spiragio

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Population density map of North Korea.

by @researchremora

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Happy Pi Day! There are many circular sights to see from the Overview perspective. Here are a few of our favorites:

Pingyuan Reservoir, China

Nardò Ring, Italy

Apple Park, California, USA

Seville Solar Concentrator, Spain

Great Blue Hole, Belize

Source imagery: Maxar / Nearmap

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Texas population density map.

by @MrPecners

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beautiful visualization!

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2023 Turkey Earthquakes Building Damage Assessment Map is live on:

https://hasar.6subatdepremi.org/

10.2K buildings collapsed

5.71K Needs to be demolished

42.5K Heavily Damaged

140K Slightly Damaged

by @asturksever

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Beijing Daxing International Airport is one of two international airports serving Beijing, China. Its star-shaped terminal building, seen here, is the largest single-structure airport terminal in the world at about 700,000 square meters (7.5 million square feet). Daxing began operations in September 2019 and has served more than 50 million passengers since.

39.509040°, 116.411530°

Source imagery: Maxar

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Collapsed building detections in south-east Turkey following the Feb. 6, 2023 earthquake.

Automated proposals of collapsed buildings are generated by a rubble detector followed by spatial aggregation.

Original images are property of Maxar Technologies, and are made publicly available under the Open Data Program

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Syria, Atlas of Human Settlements, 2021

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Aleppo, Syria 2021 - Atlas of Human Settlements @ Atlas AI

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Atlas of Human Settlements @ Turkey & Syria

In response to the recent #turkeyearthquake & #syriaearthquake, we are proud to announce that our Atlas of Human Settlements (AHS) 2021 #datalayers for #Turkey and #Syria are now publicly available. The AHS data offers crucial intelligence for #crisismanagement bodies in their immediate efforts to respond to the #disaster, as well as to help inform the most #sustainableapproach to long-term rebuilding efforts.

Our AHS product is designed to help #response agencies answer questions such as: 1. Where were buildings clustered in the highest density before the incident? 2. Which clusters coincide with the highest population density? 3. How best to approach / access the densest built-up parts within settlements?

More information and free access to the AHS for #Turkey and #Syria can be found on #GoogleCloud’s Analytics Hub listing page at https://t.ly/MRWZ

You can read our full statement here: https://lnkd.in/dPUVxwFZ

Images above: Atlas of Human Settlements Map for Turkey (top), city of Aleppo in Syria, 2021

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Guangzhou is one of China’s fastest growing cities, its population more than tripling from 5 million in 1980 to 18.6 million in 2020. The city has seen a huge influx of migrants in recent years, spurred by its fast-growing economy and high labor demands. Guangzhou is at the heart of the Guangdong–Hong Kong–Macau Greater Bay Area, the most-populous built-up metropolitan area in the world with approximately 65.5 million residents.

23.130000°, 113.260000°

Source imagery: Google Timelapse

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Eratosthenes of Cyrene

He is best known for being the first person known to calculate the circumference of the Earth, which he did by using the extensive survey results he could access in his role at the Library; his calculation was remarkably accurate. He was also the first to calculate Earth’s axial tilt, which has also proved to have remarkable accuracy. He created the first global projection of the world, incorporating parallels and meridians based on the available geographic knowledge of his era..

Read more: https://en.wikipedia.org/wiki/Eratosthenes

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Road Network Extraction in Africa

The presence and state of road networks are key indicators in socioeconomic analyses using remote sensing data. At Atlas AI, we developed a low cost ROad SEgmentation (ROSE) method using state of the art deep learning technology that delivers primary, secondary and thryicary roads from 5m resolution monthly-issued basemaps of Africa - NICFI @ Planet.

The images above demonstrate some key results over Nairobi, Kenya for the year 2022. Segments in white, show the refined inference results (noise removed) and those in red are the results of our auto-complete algorithm

Disclaimer: The ROSE layer is not a commercial product. It is a research layer only.