About Skygauge

Given a coordinate or a locality, Skygauge returns three numbers and their delta:

• Theoretical ceiling. The maximum permissible top elevation derived from ICAO Annex 14 obstacle limitation surfaces (six per airport) for CSMIA, Juhu, and Navi Mumbai International Airport.
• Empirical band. The median permissible top of recently issued AAI NOCs in the neighborhood, recency-weighted, with the range and % restricted.
• DP height cap. The MCGM Development Plan 2034 height limit — an additional planning constraint layered on top of the aviation OLS.

All ingested data is public.

• Issued NOCs from AAI's NOCAS portal and Project Maitree's historical snapshot.
• Appellate Committee proceedings from AAI, with deep-links to the original minutes PDFs.
• MCGM DP 2034 contour + height layers (survey ground elevation, permissible/restricted height polygons).
• Site elevation via Google Elevation as a fallback.

We do not republish raw datasets — we surface derived insights with attribution and links back to the source documents. The NOC dataset refreshes daily via an automated scrape of the public AAI endpoint.

Skygauge is not a formal sanction. Per AAI's own disclaimer, height clearance is issued through the NOCAS portal. Use Skygauge for pre-application planning — it will tell you whether the site is likely permissible before you spend the fee.

The tool is indicative only. The engine's median delta versus real approvals is roughly ±15 m for restricted NOCs and ±24 m for unrestricted — mostly explained by case-by-case AAI approvals above the geometric surface (which no pure engine can predict) and instrument-procedure restrictions below (which the empirical layer is built to surface).