Met with JSR and discussed the situation wrt geo plans and properties. Collected the remaining issues with missing plans and turned them into detailed requests for the NWLTO to go back to original titles and confirm/correct data to find them; sent this to JSR to forward. Also did stats on the problems generated by these issues; the number of affected titles is quite low, but we don't know what the number of affected "chains" is yet, because we don't know how chains should be constructed. However, I did make some progress on this. I've started some XSLT to build a spreadsheet of per-lot value histories per sq metre in 2016 dollars.

The next stage is to figure out how to continue the chain for an extinguished lot. My suggested approach is to analyse the potential overlap of all lots, in order to discover any pairs which overlap by more than 50% of the area of one of them; this should be sufficient to generate a link between them, and then any chain can be continued by following [one of] the lot[s] into which it was [de]composed. I think this can be done in JavaScript using Node and the Turf.js library, specifically turf intersect. I'll need to script and test this, then it'll run for many hours to generate all the required lists.