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If I understand correctly, most land lots are in local coordinate systems and use ground-based anchors as reference, not geographical coordinates (sky, GPS). Wh
by culebron21 2y ago
If I understand correctly, most land lots are in local coordinate systems and use ground-based anchors as reference, not geographical coordinates (sky, GPS). When there's a slip, the only difficulty is to re-mark the zigzag.
That works very well for Australia that moves northwards at 10 cm per year, IIRC.
- pfdietz 2y agoAustralia as a whole moves northward? That wouldn't alter local relationships. The concern would be when land moves on a fault and plots become distorted, like those well known pictures of roads and streams jogging sideways on the San Andreas fault.
- culebron21 2y agoI meant that if Australia had geographical coordinates in the land lots definitions, they'd have become very incorrect in a couple of decades.
- foobarian 2y agoThe point is that if our properties are defined using survey markers (like my deed, which literally spells out in English where the plot starts, how many feet this way and that) this will stand up to ground shifting. It will be the mapmakers' problem to redraw the maps though.
- lazide 2y agoIt doesn’t stand up to shifting, often, because one landmark at one corner may move relative to another. If the fault is through the middle of the property.
- potato3732842 2y agoYes, it does. The square footage of a particular parcel would be what changes. This frequently comes up when parcels are defined as being bounded by a river or something. 999x/1000 it's a non-issue.
- plorg 2y agoI assume the conflict would arise if two adjacent parcels defined by fixed size borders were defined by different survey markers that moved relative to each other, creating a space that is unclaimed, a space that is claimed under both deeds, or some of both. Probably in the course of resolving this conflict the parties who owned the conflicted land would get new surveys performed and perhaps have additional survey markers installed to define the new border for both parcels. The point of conflict here being that not every vertex of a parcel is necessarily defined by a survey marker.
- ben_w 2y agoSure, but the ground is moving relative to other ground, so ground anchors can be in conflict. Also, IIRC San Andreas is a transform fault? So conservative? But not all are. Or are ridges and subduction limited to oceanic crust?
- mattpallissard 2y agoThis is how it works where I live in the US. When a river channel moves someone gains and someone loses.