populationSlice = _(population)
.map(d => ({ ...d,
sliceLatNumber: latSlices[d.lat].populationSlice,
sliceLatAlternate: latSlices[d.lat].populationSlice % 2,
sliceLongNumber: longSlices[d.long].populationSlice,
sliceLongAlternate: longSlices[d.long].populationSlice % 2,
}))
.value()