Very high-resolution (<1m) aerial and satellite imagery is crucial in pre- and post-disaster scenarios. However, the licenses associated with these images often restrict their use, making them legally inaccessible for most purposes. This document aims to provide you, the GIS professionals, disaster response organizations, and individuals seeking access to very high-resolution aerial and satellite imagery, with a guide to imagery sources that offer licenses, allowing for a wide range of use cases, especially during a crisis. We focus on very high-resolution imagery, as it is usually required to digitize physical features for maps like OpenStreetMap.
Caution
Disclaimer: Each use is a different intellectual, geopolitical, and economic case. There is no guarantee that the guidance is valid for your case. And yes, surprise, it's not legal advice.
Note
Feel free to add your experience and tips for countries and use cases in the details section.
Currently, there are many providers for very high-resolution imagery (via satellites, aerial vehicles, drones, etc). Governments or private companies (in close relations with governments), such as Airbus, Vantor (formerly Maxar), Planet, and many others, operate in space or in the air. Both governments and private companies usually distribute data with 3rd-party companies or institutions. It's not easy to access them without the distributors. There are also community-driven initiatives such as OpenAerialMap, where people publish their proprietary imagery under free licenses or as already free-licensed data.
During disasters, many satellite providers contact International Disaster Charter to align on imagery acquisitions. Although you can see the images acquired on the activations, the charter does share data with you if you meet the criteria mentioned here. Governments, local initiatives, and international NGOs also operate imaging with aerial vehicles and drones. Most of the images are under proprietary rights, limiting many of the use cases for public initiatives. Batu gave a talk about this here.
There is now Common Space, which strives to solve this problem for Humanity. The authors of this document think strictly that we are all Humans.
Depending on your use case, in which part of the Earth you are, your budget, and many other entangled legal and bureaucratic systems, you are not free to use the imagery you see on your screen. For our scope, this guidance and this article are a nice summary of the issues related to legal and economic boundaries. If you use imagery without proper rights, it's up to the providers to claim copyright infringement.
Usually, Creative Commons licenses enable people to create derivative works based on the imagery and publish them publicly. Recommended types are listed by GEO Data and Knowledge Working Group in this guide Imagery providers are encouraged to publish their data with such licenses so that the people can take action with minimal legal concerns. If the imagery does not have such a license, it's best to specify your use case in the permit.
Only in some places. The sources below are usually the only ones if your government does not share imagery with the public.
During disasters, HOT representatives usually use the OAM base map to collaboratively edit OpenStreetMap Point of Interest (POI) data thanks to the mosaic layer provided by Kontur. OAM is another development round by Development Seed, as announced here.
There is now a good tool called GeoLibre integrated this data source, as explained here.
Vantor used to be called Maxar.
Some governments already provide imagery to OpenStreetMap editors or have open data programs. If you don't have an open data program, you'll likely need to handle complex communication steps to obtain access. It's worth mentioning new providers such as Umbra, which is now manipulating the industry with courageous licensing offerings.
During disasters, it's best to sync with Humanitarian OpenStreetMap Team representatives to determine which license is required for imagery to edit POIs and upload to OpenStreetMap. For other use cases, you can find further details in wiki for resources.
Germany is probably the best country advocating free data. You can find aerial images in OSM if you'd like to edit. Bundesamt für Kartographie und Geodäsie contributes to OSM (wiki page). You can find their open data center here. If you'd like to download the images, you probably need to find the responsible body within a province. For example, Bayerische Vermessungsverwaltung releases 40cm orthophotos in here.
The Turkish government doesn't have an open imagery program, and it's also not very easy to access data. Feel free to contact the members of Yercizenler for further guidance.