The data has been collected through open sources and cross-referenced using a wide range of information. These include local and international news agencies and media reports; social media accounts, including Twitter, Facebook, YouTube and other video footage, and WhatsApp; reports from international and national NGOs; official records from local authorities; and reports by international human rights groups. Where independent reporting is not available, the data has been cross referenced with sources from opposing sides to the conflict as to ensure the reporting is as accurate and impartial as possible.
The dataset lists target category and subcategory for each incident, apart from incidents where no information on the target is available. The target category chosen for each incident refers to the original use of the target, e.g. a school hit by an airstrike is referred to as a school building, with no further assessment on its use at the time of the airstrike or the circumstances that led to the airstrike.
As the data is collected using open sources and as there is a general lack of transparency from the parties to the conflict, as well as a lack of independent reporting on the ground, the data presented has been verified and cross-referenced to the extent possible. It is important to note, however, that due to the context of the current situation in Yemen there are significant challenges in accessing independent sources for verification of incidents. The data presents our best current understanding of the incidents included and are reported in good faith.
The data has been collected with the purpose of creating a statistical overview of the impact of the aerial bombardments in Yemen, especially in regard to geographical spread and its targeting. The data does not include casualty figures, neither combatants nor civilian, as in the current context of Yemen casualty monitoring presents significant challenges. There is a wide variation in the quality of casualty recording, much of which is highly politicised, and it has not been possible to independently verify such claims.