Tilth stands on open maps and open data. This page names them and their licences, because several of them ask for it, and because being straight about where the numbers come from matters.
Satellite imagery is Esri World Imagery: imagery © Esri, Maxar, Earthstar Geographics and the GIS User Community, used under Esri's terms of use.
The street map is OpenStreetMap: map data © OpenStreetMap contributors, available under the Open Database Licence.
Field boundaries and land parcels come from the Rural Payments Agency, through Defra's Data Services Platform. NVZ zones and other environmental layers come from the Environment Agency and Defra. Both contain public sector information licensed under the Open Government Licence v3.0.
The plant health layer uses Copernicus Sentinel-2 satellite imagery. It contains modified Copernicus Sentinel data, processed through Sentinel Hub.
The farm forecast uses data from Open-Meteo.com, licensed under CC BY 4.0.
The map is drawn with Leaflet. The app is built with Next.js and React. Field areas are measured with Turf, boundaries are read from shapefiles with shpjs, and your data export is packed with JSZip. Thanks to everyone who makes these free to use.