Deep Oʻahu builds one record for each of ≈326,000 Oʻahu properties out of four separable layers: what a public authority published, the geometry and the aerial capture, what follows deterministically from those two, and the measurements of the physical property itself. Every layer says which one it is.
They are kept apart on purpose. A field somebody else published, a calculation we ran, and an observation a model made are three different kinds of claim, and the page tells you which one you are reading.
Seven public-record sources and seventeen datasets, fused by TMK into one record per property. Around 320 fields, each kept with the date its source published it, and none of them rewritten into a score.
Every parcel on Oʻahu as a mapped boundary, under the county's own 2024 aerial capture — self-hosted, served from our own tiles, and attributed wherever it appears.
Reproducible geometry over the layers beneath it. Two boundaries either overlap or they do not; the same inputs give the same answer every time, and we will show you which two shapes were compared.
See a derivation →Measuring what a record cannot describe: what can be seen from a property, how steep it is, what could be built beside it, and what has physically changed. Each measurement carries the evidence it was drawn from.
See the whole intelligence layer →One flight, flown in 2024, self-hosted and served from our own tiles — not a stitched mosaic of somebody else's basemap.
At the deepest level the capture resolves 7.94 cm per pixel, which is close enough to read a driveway, a hedge line and a lānai apart. Parcel boundaries are drawn over it from the State's Oʻahu parcel layer, so what you are looking at and what the record describes are the same object.
Open the mapEvery capture is attributed to the authority that flew it and dated to the year it was flown, so a measurement drawn from imagery can always be placed in time.
Every derivation on this layer is geometry over a published boundary, and the page names both shapes it compared.
Whether a property sits in a flood zone is not a judgement. It is whether its parcel boundary intersects a FEMA polygon, and if it does, which zone that polygon carries. The same holds for the State's 3.2 ft sea-level-rise inundation area, for the mapped cesspool inventory, and for resolving which of ≈326,000 properties sit on which of ≈172,000 parcels.
When a property fails one of the five Hawaiʻi checks, the product says which rule it failed rather than dropping it silently — so a result you did not expect is something you can argue with.
An overlap between a parcel boundary and a hazard polygon is a fact about two maps. It is not a statement about a building, a person, a meter or an insurance outcome, and we do not write it as one.
The intelligence layer, on top of the record and the geometry.
Public records describe a property on paper. They do not say what can be seen from it, how steep it is, what could be built beside it, or how exposed its outdoor space is. Deep Oʻahu measures those things from geospatial evidence and publishes each one with the evidence class it belongs to and the inputs it was computed from.
A measurement is not a record, and the page never sets them in the same type. Each one carries its class, its confidence where a model produced it, and the date of the inputs behind it.
The open sector from a chosen point on the property, with the structure or terrain that closes the rest of it named.
The same measurement recomputed against a modelled neighbouring buildout, so you can see what a plausible building next door would take away.
Slope across the building site and along the access to it.
Roof area, pitch, orientation and complexity, and the building footprint under it.
How exposed the outdoor space is to roads, neighbouring structures and elevated ground.
Modelled sun and shadow across a parcel through the day and through the year.
What the zoning envelope allows on the parcel, read against the ground it actually sits on.
What has changed on the ground, read across the aerial record for the parcel.
The capture record for the parcel, so a structure can be placed in time rather than only in space.
Condition observed from imagery, published as an observation with its confidence and the evidence it was drawn from.
Which class of evidence produced it, which inputs it was computed from, and when those inputs were published.
Four classes of evidence, kept apart on every page, so you always know which kind of claim you are reading.
Fields published by an identified public authority — the county assessment roll, the State's parcel and zoning layers, FEMA's flood mapping, the Department of Health's cesspool inventory, the county permit record. We keep every field a source publishes, and we keep its date.
Reproducible geometry: whether this parcel intersects the sea-level-rise area, how far the nearest traffic counter is, which properties sit on this parcel. The same inputs give the same answer, every time, and the inputs are named.
Model inferences, such as classifying what is visible in imagery. Each carries a confidence value and the evidence it was drawn from, and each is labelled an observation rather than a fact.
Which class of evidence produced this number, which source it came from, and when that source last published. If you disagree with a field, the county's own record is one click away.
Leasehold
A decoded county field. It is not a title opinion, and it says nothing about the ground-lease term, rent or buyout.
Zone AE · Special Flood Hazard Area
An overlap between two mapped shapes, and a regulatory designation. It is not a risk assessment and it is not an insurance determination.
Open ocean sector, partially obstructed
Published as an observation, in the fixed pattern: "Model observation · confidence 0.7 · not a verified fact."
Deep Oʻahu is a research tool, not a survey, appraisal, title report, or legal opinion. Verify anything material with the authoritative source or a licensed professional.
Open the map and look up a property you already know. Every line you find has a source and a date beside it, and the county's own record is one click away.