Layers
Methodology & data status
Three independent maps
Category I: Figure 207A.5-1C (page 2-40). Category II: Figure 207A.5-1B (page 2-39). Categories III, IV and V: Figure 207A.5-1A (page 2-38). Assignments follow the supplied figure captions.
Reviewed contours only
No wind speeds are inferred from longitude, basemap colors, city names, or nearby contours. The scanned maps are not yet georeferenced. No approved geographic wind dataset is currently published.
Engineering interpretation
The supplied notes describe 3-second gust speeds at 10 m above ground for Exposure C and permit linear interpolation between contours. Any digital interpolation model requires independent engineering validation. Special terrain and wind regions require additional assessment.
Basemap: OpenFreeMap, OpenMapTiles and OpenStreetMap contributors. Geographic labels are separate from the NSCP wind dataset. Search shortcuts and wind calculations run in your browser; the basemap provider receives normal tile requests. Source scans are not publicly redistributed.