Building permits are the standard dataset for tracking development pipelines. Every CRE analyst pulls permit data. But permits only capture what’s officially filed — and the reality on the ground is often 15–20% ahead of the paperwork.
The Satellite Layer
Axiom Locus cross-references municipal permit data with Sentinel-2 satellite imagery and NLCD land cover change data. When these three sources agree, confidence is high. When they diverge, the divergence itself is the signal.
Sentinel-2 satellites pass over every US metro every 5 days, providing multispectral imagery that can detect construction activity, land clearing, and building footprint changes. We process this alongside NLCD (National Land Cover Database) data that tracks annual land use transitions — agricultural to urban, open space to developed, low-density to high-density.
Where the Gap Appears
The permit-satellite gap is widest in three scenarios: adaptive reuse projects (converting warehouses to lofts without new construction permits), speculative site prep (land clearing and grading before permits are filed), and phased developments where early phases begin before later phases are permitted.
The Land Cover Delta
NLCD data shows a consistent 2–3% annual densification rate in growth corridors across our 22 metros, compared to 0.1% in stable established areas. This data captures the macro trend — where the urban boundary is expanding and where infill is intensifying. Combined with point-level satellite detection and permit records, it creates a three-layer development pipeline that’s significantly more complete than any single data source.
| Data Layer | Update Frequency | Captures | Misses |
|---|---|---|---|
| Permits | Monthly | Official filings, values | Pre-permit work, unpermitted changes |
| Satellite (Sentinel-2) | 5-day revisit | Active construction, clearing | Interior renovations |
| Land Cover (NLCD) | Annual | Macro densification trends | Small-scale changes |
CRE Implications
The real development pipeline is 15–20% larger than permit data alone suggests. This matters for competition analysis (more supply coming than the market thinks), timing decisions (satellite detects activity 2–6 months before permits reflect it), and neighborhood trajectory assessment (land cover deltas show where densification pressure is building). Our Development Pipeline signal group (12% of composite weight) blends all three data layers to give a more complete picture than any single source.
For investors: if your competitor analysis relies solely on permit data, you’re underestimating supply by 15–20%. Satellite confirmation isn’t optional — it’s the difference between accurate and incomplete pipeline analysis.