There are four broad sections of the gap filling engine that need to be completed for the initial build of the engine. - [x] Integrate Google Earth Engine calls into the gap filling engine - [x] Build and implement a core set of look up tables for gap filling - [x] Design and write the functions build the gap filled JSON files - [x] Build a set of tests for each gap-filling model Remaining task for this epic (25 March): - [x] Refactor crop residue models (issues hestia-gap-filling-engine#55, hestia-gap-filling-engine#49, hestia-gap-filling-engine#43, hestia-gap-filling-engine#39) - [x] Fix soilTotalNitrogenContent gap-filling model (hestia-gap-filling-engine#42) - [x] ~~Add remaining gap-filling model (nursery, unproductive and fallow periods for orchard crops hestia-gap-filling-engine#48)~~ - [x] Ensure Nutrient content gap-filling works on crop residue products, following the glossary changes (hestia-gap-filling-engine#50) - [x] ~~Add uncertainty estimates (hestia-gap-filling-engine#54)~~ - [x] Ensure the gap-filling results for the seven cycles (hestia-calculation-engine#119, hestia-calculation-engine#120, hestia-calculation-engine#121, hestia-calculation-engine#122, hestia-calculation-engine#123, hestia-calculation-engine#124, hestia-calculation-engine#125) match the gap-filling in Poore & Nemecek spreadsheet.