Temporal fabric / Saigon
Each plane is a source map independently georeferenced onto the same ground. Its image remains visible; traced blocks appear only where that extraction exists.
This is an evidence sketch, not a causal model. The stack precedes the later addition of contemporary building fabric and dated POI histories.
Drag to rotate. Click a year to isolate its source image; select a name to trace an adjacent-sheet match.
Depth is calendar time
One plane per source map, positioned from its own ground controls.