General boundaries vs fixed boundaries in cadastral surveying
Anyone who has sat through a land registry's legal framework review has hit this question: does the system record exactly where a boundary runs, or does it record roughly where it runs and leave the exact line to be settled on the ground if a dispute ever comes up. That's the whole distinction between a general boundary and a fixed boundary, and it shapes almost every decision a tenure programme makes downstream, from survey budget to how much a first adjudication pass can lean on remote imagery.
The general boundary rule, plainly
Under the general boundary rule, the cadastral map shows a line that corresponds approximately to physical features: a hedge, a wall, a fence, the edge of a path, a ditch. The registered boundary is understood to run somewhere within that feature, not at a surveyed coordinate to the millimetre. England and Wales run on this basis for most registered titles. So do a lot of African and Southeast Asian land administration systems that were built to register occupation and use rather than to pin down survey-grade geometry everywhere at once.
The practical upside for a land agency is speed. You don't need a licensed surveyor on every parcel before you can put a boundary in front of a community for adjudication. A fence line visible on a VHR pass is good enough to start the conversation. The cost is that two neighbors can still argue about the three feet of grass between the fence and the registered line, but that argument happens case by case, not as a blocker to registering the other 20,000 parcels in the programme.
Fixed boundary cadastre, and why most places don't run one
A fixed boundary cadastre records the boundary as an exact, surveyed line, usually with coordinates tied to a control network, and that line is what the law protects regardless of where the fence happens to sit. This is closer to what a classic Torrens-style land title system aims for, and it's genuinely useful where land value is high enough that a few centimetres of encroachment matters, or where boundary disputes are already common and the registry needs a line the courts can rely on without re-surveying.
The catch is cost and time. Fixing every boundary to survey standard means a licensed crew walking every parcel, which is exactly the bottleneck that stalls tenure regularization programmes in informal settlements. If the mandate is to get an unsurveyed area of a few thousand structures onto a registrable map within a programme cycle, insisting on fixed boundaries from day one usually means the programme doesn't finish, or finishes a fraction of the area it was funded to cover.
Which rule fits a first adjudication pass
Most tenure regularization work in informal settlements starts under a general boundary approach, for the reason above: it lets a programme put a drawable line in front of every household this year instead of a survey-grade line in front of a tenth of them. The sequence that tends to work is general boundaries first, community adjudication next, then targeted fixed-boundary survey only where a dispute or a high-value transaction actually requires it later.
That first map has to be close enough to the ground truth to anchor a community walk-through: structure footprints and plausible plot lines drawn straight from current imagery. Cadastre Update delineates exactly that layer from a VHR pass over an unsurveyed area, structure polygons plus candidate plot boundaries, ready to load into the cadastral GIS the adjudication team is already using.
If your programme is still deciding how to get from a blank map to something a community can argue over field by field, that's the gap this is built to close.