Restored maps / 1937 Army reprint · 1915 fieldwork
Croton area, 1937
Ten-foot contours, roads, buildings and water detail on the Army tactical-map reprint.
Full source and restored files are available below. JavaScript enables tiled zoom and comparison.
What changed
Adjusted paper tone and lightly strengthened existing ink at the scan’s native resolution. No upscaling or redrawn lettering.
This is the northern Croton-area excerpt. The linked GeoPDF includes the complete Tarrytown sheet and collar. The geographical atlas retains its existing map alignment.
Fading, scan grain and overlapping marks remain visible. Compare the original when a detail is uncertain.
Vector tracing is still being tested; this view uses the processed scan.
Source & inspection
Corps of Engineers, U.S. Army · USGS engravings · Library of Congress / USGS HTMC. Extracted from the official GeoPDF’s embedded images without resizing; complete original sheet linked below.
Independent review compared 18 areas at native scale, including nine tile boundaries. Additional lettering and dense-line samples were inspected. The processing record lists the exact scope and limits.
Original source catalogue ↗ · Source scan ↗
Native scan excerpt (67.0 MB) · Processed native excerpt (50.5 MB) · Processing & registration record ↗
Retained original checksum
4aa50d59378f28d2e0eea612cafd2d343595c8d3738a0ee44f0a938f4e33124d