The majority of localization research, and the majority of deployed systems, assume a structured world. Walls create lateral constraints. Corners and edges provide distinctive geometric features. Floors and ceilings define the vertical extent. This structure is so pervasive in the environments where most systems are developed that many design decisions are made around it without being recognized as assumptions.
In agricultural fields, forests, construction sites, open-pit mines, and natural terrain, that structure is absent. The environment is irregular and continuously varying. The ground is uneven. Vegetation presents geometry that changes with seasons and growth. There are no walls to bound lateral position uncertainty and no architectural landmarks to distinguish one location from another across a span of several hundred meters.
Standard assumptions break here in predictable ways. Planar motion models are wrong on uneven ground: a vehicle climbing a slope or traversing a berm is not moving in a plane, and a 2D localization estimate will accumulate error immediately. Feature extractors designed for architectural environments return few or no reliable matches in terrain without sharp edges or consistent planes. The localization system, calibrated against structure that doesn't exist, degrades or fails.
If your deployment involves non-architectural environments, the choice of localization architecture is the decision that determines whether the system works. We can walk through the options for your specific terrain.
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