Day 17 · Light & dark — After dark, care moves away
11.0 million people live in Sylhet division. The median person is 3.2 km from a daytime facility and 9.1 km from a 24-hour-capable one. 35% live more than 10 km from a 24-hour-capable facility; Juri is the darkest upazila (100%).
Write-up
The question
How far is a Sylhet resident from a health facility that can take an emergency at night, compared with by day?
Methods
- Lit = LGED district hospitals and upazila health complexes (24-hour by policy), facilities tagged emergency = yes, and facilities tagged open 24/7 in the registry or OSM; points within 150 m counted once.
- Daytime = any LGED tier 2–4 facility plus registry and OSM hospitals, clinics, centres and doctors (pharmacies excluded).
- Population: upazila totals (BBS Census 2022) spread over 500 m cells weighted by mobile-tower density; the upazila totals are preserved exactly.
- Straight-line distance from each cell centre to the nearest facility with a k-d tree; medians are population-weighted.
- Browser click tool computes the same distance with a haversine formula.
Findings
11.0 million people, 47 upazila units, 59 24-hour-capable places and 619 daytime facilities.
The median resident is 3.2 km from a daytime facility and 9.1 km from a 24-hour-capable one.
67% of people are more than 5 km, 35% more than 10 km and 9% more than 20 km from a 24-hour-capable facility (by day, beyond 5 km: 19%).
The darkest upazila is Juri (Moulvibazar): 100% of its people live more than 10 km from night care.
Night adds the most distance in Madhyanagar (+28.3 km): day care is near, night care is not.
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