13.4.1 — Refugee Support — maturity: live

Camp Population Estimation

Using very-high-resolution optical and SAR satellite imagery to count structures, estimate occupancy and derive accurate population figures for refugee and IDP camps.

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Governments and humanitarian coordinators cannot plan water, food, health or shelter delivery without knowing how many people they are serving. Ground-based census methods in large, rapidly expanding camps are slow, politically contested and frequently manipulated — populations are over-reported to attract aid or under-reported to avoid scrutiny. Satellite imagery cuts through that fog: structure counts derived from sub-metre optical or SAR data, combined with validated occupancy coefficients, produce population estimates accurate to within 10–15 % within days of a tasking request.

The satellite stack combines very-high-resolution optical imagery for shelter delineation and SAR for cloud-penetrating revisits during rainy-season crises when optical tasking fails. Machine-learning pipelines segment individual shelter footprints automatically, flag new construction since the last pass and generate change-detection alerts when population surges occur. A sovereign national system adds one critical advantage: the host government can task the constellation on its own schedule rather than queuing behind commercial customers or waiting for a foreign donor to authorise a re-tasking.

The operational outcome is a rolling, auditable population baseline that drives logistics allocation, donor reporting and protection planning. When a camp expands overnight after a new displacement event, the national emergency management authority receives an updated estimate within 24 hours rather than weeks. That speed is the difference between a well-supplied response and a mortality crisis.

What matters

Sub-metre resolution is the minimum threshold for reliable individual shelter delineation; 30–50 cm optical delivers usable counts even in densely packed informal settlements.
SAR revisits are operationally essential: the world's largest refugee crises — Cox's Bazar, Kakuma, Bentiu — sit in tropical or semi-arid zones with frequent cloud cover that defeats optical-only constellations.
Population estimates derived from commercial foreign platforms are subject to re-tasking delays, licensing restrictions and data-sharing clauses that can expose beneficiary locations to third-party governments.
UN OCHA and donor agencies require independently verifiable population figures for funding allocation; satellite-derived counts provide the audit trail that field surveys alone cannot.

Sovereignty score: 8/10 — A nation hosting or managing refugee populations cannot afford to depend on foreign commercial platforms or donor goodwill to know how many people are on its own territory.

Geopolitical leverage: commercial very-high-resolution imagery of sensitive camp locations is controlled by US ITAR and EAR export regulations, meaning access can be suspended or conditioned by a foreign government at any time.
Operational independence: donor-funded tasking agreements impose re-tasking queues and data-sharing obligations that expose beneficiary location data to third-party intelligence services without the host government's consent.
Legal accountability: host governments bear legal responsibility under international refugee law for the welfare of camp populations; accurate sovereign population data is essential to discharge that duty and to audit aid flows against real need.
Supply-chain resilience: reliance on a single commercial SAR or optical provider creates a single point of failure; a national constellation with multiple payloads ensures continuity during vendor outages, bandwidth restrictions or conflict-driven access denials.

Reference architecture

Payload: Primary: panchromatic and multispectral optical imager, 40–50 cm GSD, 12 km swath, for shelter delineation; secondary: X-band SAR, 1 m spotlight resolution, 10 km swath, for cloud-penetrating revisits and change detection
Bus class: ESPA-class microsat, 120–160 kg, 600 W payload power, supporting both optical and SAR payload variants on separate bus designs within the same programme
Orbit: Sun-synchronous LEO at 480–530 km altitude; 6-satellite constellation (4 optical + 2 SAR) in a Walker delta configuration providing sub-24-hour revisit over any camp site in the tropics
Ground segment: 2-station national ground network (X-band downlink, S-band TT&C) co-located with the national disaster management authority; SatNOGS UHF/VHF backup for housekeeping telemetry; secure fibre interconnect to the national data centre
Software & data
Latency
Cost band
Lead time

References

UNHCR Global Trends: Forced Displacement — UNHCR's annual flagship report documents the scale and geography of forced displacement worldwide, underpinning the operational need for accurate, timely camp population data.
UNOSAT — Satellite Imagery for Humanitarian Response — UNOSAT routinely delivers satellite-derived camp population estimates and shelter counts to UN agencies and member states, demonstrating the live operational validity of the methodology.
ESA Copernicus Emergency Management Service — Refugee and IDP Mapping — Copernicus EMS has activated on multiple refugee camp events, providing rapid mapping products that include shelter footprint delineation and population proxy estimates.
WorldPop — High-Resolution Population Estimates — WorldPop documents the statistical methods for combining satellite-derived building counts with household survey data to produce gridded population estimates at 100 m resolution.
OCHA Centre for Humanitarian Data — Displacement Data Standards — The OCHA Centre sets interoperability standards for humanitarian population datasets, including requirements for satellite-derived displacement and camp population products.