The stereotype of an Indiana assessment update is a county employee with a clipboard measuring your deck. The 2026 reality increasingly looks like this: high-resolution aerial imagery flown over the county, software comparing this year's rooflines against last year's and against the sketches in the CAMA system, and a queue of flagged parcels — new outbuilding here, extended footprint there, pool where the imagery used to show grass — reviewed by staff at a desk.
This shift is legal, it's spreading, and it cuts both ways for taxpayers. Here's how the technology works in Indiana's process and how to respond when it touches your parcel.
The Legal Frame: Cyclical Reassessment
Indiana requires each county to physically review every parcel over a rolling four-year cycle — about 25% per year — under plans the DLGF approves; the current cycle runs 2026–2030, per the DLGF's cyclical reassessment plan memo. County reassessment contracts routinely specify that reviewers work from parcel maps, GIS, aerial imagery, property record cards, and permit lists — imagery is now standard equipment in the reassessment bid documents counties publish.
What the Software Actually Does
Vendors in this space — EagleView and Nearmap are the prominent names, and Indiana counties such as Warrick have publicly discussed using oblique imagery for desktop appraisal — sell assessors three capabilities:
- Change detection. Software compares imagery vintages and flags parcels where the built footprint changed — additions, new detached garages, pole barns, pools.
- Sketch verification. Automated comparison of imagery against the CAMA sketch catches structures that were never on the record card at all.
- Desktop review. Oblique (angled) imagery lets staff evaluate stories, condition, and features without a site visit — which is how counties actually cover 25% of parcels a year.
For the county, this is efficiency. For taxpayers, it changes the detection profile: the unpermitted deck that a windshield survey missed for a decade is now a pixel-diff away from the roll. As we covered in the home improvements guide, skipping permits never avoided assessment — imagery just shortens the delay.
Where Imagery-Driven Assessment Goes Wrong
The technology finds change; humans still interpret it, and the error patterns are predictable:
| Imagery says | Reality | Result if unchallenged |
|---|---|---|
| New structure | Temporary/seasonal item — carport canopy, above-ground pool since removed | Permanent improvement on the card |
| Larger footprint | Roof overhang, unheated porch, or shadow read as living area | Overstated square footage |
| Building present | Structure demolished after the flight date | You keep paying on it |
| Same house, "improved" | Re-shingled roof read as renovation | Condition/grade bump without interior basis |
The common thread: imagery sees roofs, not interiors and not quality. A desktop review can't verify an unfinished interior, a gutted-but-stalled project, or storm damage — categories where the damage reassessment process exists precisely because the outside view misleads.
Warning
If your AV jumps in a year you built nothing, pull the property record card first and compare it against the prior year. An imagery-cycle error announces itself as a specific new line item — added square footage, a new outbuilding, a changed grade. That specificity is your friend: factual record errors are the easiest appeals to win, and ground-level photos of what's actually there beat aerial pixels at the PTABOA table.
Your Playbook When the Desktop Review Finds You
- Watch the Form 11. Imagery-driven updates surface as assessment changes on the Form 11 notice, with the standard appeal window.
- Get the record card and the sketch. Ask the assessor what changed and on what basis — counties will tell you if the change came from imagery review, permits, or a field visit.
- Document reality. Dated ground photos, measurements, contractor invoices for what was (and wasn't) done.
- Report demolitions proactively. Change detection is asymmetric in practice — additions get flagged faster than removals. If you tore something down, tell the assessor; don't wait for the next flight.
- Appeal on the specifics. A Form 130 appeal contesting a concrete record error (that "addition" is an awning; that outbuilding is the neighbor's) is the strongest kind. Our appeal data guide covers evidence assembly, and the tax appeal service handles contested cases.
Track your own AV history the same way the county tracks your roofline: your parcel's year-over-year record is visible in our property lookup and the Indiana explorer — a jump you didn't cause is your cue to investigate, not absorb.
Imagery and change detection are the newest pieces of the county software layer — where they fit in the full stack of state portals, CAMA systems, and taxpayer tools is mapped in the complete Indiana property tax software guide.