A Great Map project
Project sources
The project separates geographic evidence and optional population context from editorial scenario interpretation. These records explain each role without blending them.
11 records- 01Natural Earth 4.1.0 / world-atlas 2.0.2
- 02Base geography2025, 1:500,000
2025 States Cartographic Boundary File
State geometry and identities; coverage geometry for population is exactly 50 states plus Washington, D.C.
- 03Base geography2025, 1:500,000
2025 Counties Cartographic Boundary File
County geometry and identities when County mode is active.
- 04Present-day state capitals and Washington, D.C.
- 05Visible thematic data2025 estimate; Global2 R2025A v1 alpha; constrained total population; 30 arcsec
WorldPop Global2 R2025A v1 U.S. constrained population, 1 km
Only displayed population context at every zoom when enabled.
- 06MethodologyCurrent release; WorldPop 2025 at 1 km
General United States population-density methodology
Shared current WorldPop-only display, validation, and limitation methodology.
- 07Project interpretationProtected template revision 1
Current Reality protected-template methodology
Current Reality scenario methodology.
- 08Project interpretationDonor baseline 023aaa6
Original Post-USA protected-template methodology
Original Post-USA scenario methodology.
- 09Validation only2025 modeled epoch; R2023A; WGS84 30 arcsec; V1.0
GHS-POP R2023A 2025 epoch, WGS84 30 arcsec
Numerically compared on the US-E equal-area grid; never displayed or blended.
- 10Validation only2020 count; Revision 11; adjusted to 2015 UN WPP country totals
GPWv4 Revision 11 2020 population count adjusted to 2015 UN WPP totals
Adjusted GPW baseline used for US-E validation only.
- 11Validation only2020 decennial Census; tabulation-block geography
2020 Census P.L. 94-171 block population and geography
Official 2020 national, state, and block evidence used for validation only.