N 36°03'

Orange County, North Carolina  ·  Est. 1752

ChiltonMaps

Cartographic tools & historical research for the landscapes that shaped us

N S E W

— Portfolio of Works —

I Live Wm. Courtney Robt. Hogan 1752 – 1800

Historical Web Map

Old Orange Land Grants

Over 8,000 colonial and early federal land grant polygons reconstructed from original survey records — the cadastral fabric of Orange County from its founding in 1752.

II Live 1. RaDB 1/1 2. RaDB 1/2 3. RaDB 1/3 1. CDB A/1 2. CDB A/1 3. CDB A/3 MC 7 counties · 28,000+ entries

Deed Abstract Database

Deed Books of Old Orange County

Full-text searchable abstracts of the earliest deed books of Orange County and the six of counties later erected from it (down to about 1805) — over 28,000 individual land transactions, indexed by name and place.

III Live Eno River Little River Flat River New Hope Cr. N ca. 1752 hydrology

Historical Web Map · Hydrology

Historic Waterways of Orange County

All named rivers, creeks, and branches within Orange County's original boundaries (as it was in 1752) — reconstructed from colonial surveys, old maps, and occasionally personal interviews.

IV Live Ayr Mount 160m 840m N Periwinkle Project · 2026

GIS Field Research Tool

The Periwinkle Project

Using LiDAR terrain analysis and geodesic viewshed modeling to locate forgotten enslaved burial grounds in Orange County — a phone-based field tool for cemetery prospecting in the plantation landscape.

V Live N

Web Mapping Application

Orange County Explorer

An interactive LiDAR hillshade mapping tool for historical field research — land grants, cemeteries, geomorphons, and the hidden landscape of Orange County.

VI Live the color line UNC N

Historical Web Map

Chapel Hill's Color Line

Winner of the 2025 UNC GIS Day Map Contest. A geographic history of residential segregation, environmental racism, and Jim Crow in Chapel Hill, NC.

VII Live Ayr Mount ODB 8/251 ODB 22/150 ODB 22/416 N 1799 – present

Historical Web Map · Deed Research

Ayr Mount

The Kirkland family's historic homeplace in Hillsborough, mapped through its original deed chain — with biography pages documenting the enslaved people, free people of color, and white families whose lives intersected on this landscape.

VIII Live Control Points RMSE: 2.3m Points: 12 Transform N

Georeferencing Tool

Map Georeferencer

A browser-based tool for georeferencing historical maps — align scanned plats and survey maps to modern coordinates using control points and affine transformation.

IX Live GPS · EXIF · field documentation N

Field Documentation Tool

PhotoMap

A browser-based map displaying features collected from geotagged photos taken in the field — linking images to place.

X Live sub-solar meridian equinox, Sept. 2026 θ = 0° at 8.5°E r = colatitude, S. Pole origin N FirstLight25 · FL25 · k=25

Coordinate System

FirstLight25

A global (r, θ) coordinate system with no arbitrary or colonial origin — anchored at the South Pole, with its prime meridian derived astronomically from the sub-solar point at equinox rather than inherited from any national survey.

XI Live 24 30° low-distortion band N slippypoles · rotated Mercator

Cartographic Engineering

Slippypoles

A custom slippy map that rotates through twenty-four Mercator projections to keep every point on Earth — the poles included — inside a low-distortion band, with a hand-built compass rose and a tile system that halves its own storage by deriving one hemisphere's tiles from the other's.

XII Forthcoming TERRA INCOGNITA

In Development

More Work to Come

New cartographic and historical research projects are in progress — including spatial analysis of Free People of Color communities, historical deed mapping, and PhD research on the spatial organization of slavery.

MC
Mark Chilton
Orange County

Former Register of Deeds for Orange County, North Carolina, now a doctoral student in Geography at UNC Chapel Hill. For thirty years I have been reconstructing the cadastral landscape of this corner of the Piedmont — tracing land grants and deeds, trying to connect freedom papers, sales & other legal records of enslaved people, and indigenous geographies through the language of metes and bounds. These maps are an attempt to make that history visible.