How Much Emergency Water Per Person? 3-Day Amounts by Household Size
Store about 1 gallon 4 liters of water per person per day, at least 3 days. A family of four needs 12 gallons. Tables by household size and storage tips.
Safe-LifeBlog
Public CCTV data analysis and how-tos, emergency preparedness, and app development notes
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Safe-LifePublishing a Wear OS Watch Face on Google Play in 2026 - WFF, AAB, and Two Rejections
What broke when we shipped a paid Watch Face Format app on Google Play: a dex file that must not exist, the Editable flag, two rejections.
Dev Tips
How Fresh Is Korea's Public CCTV Data? Comparing Record Ages Across 16 Regions
Korea's national CCTV standard dataset mixes base dates from 2020 to 2026. We analyzed 378k records to see which regions publish fresh data.
ViewconeHow Accurate Is Korea's Public CCTV Dataset? What I Found Building a Nationwide CCTV Map
Cleaning 380k rows of Korea's CCTV dataset revealed shared coordinates, cameras pinned to one spot, and install dates from 1899.
ViewconePublic CCTV in Korea: How Many Cameras Does Each Region Have?
We aggregated Korea's national CCTV standard dataset by province. Regional camera counts, purpose breakdown, and how to read the numbers carefully.
ViewconeAre Neighborhoods with More CCTV Really Safer?
A meta-analysis of 41 CCTV studies found a 16% average drop in crime, but 51% in car parks and 7% in city centers. Why camera counts cannot measure safety.
ViewconeHow to Request CCTV Footage in Korea
How to request public CCTV footage in Korea: the request form, ID, subway cameras, the 30-day retention rule, the 10-day deadline, and reasons for refusal.
ViewconeHow to Check CCTV Locations Near You in Korea (Free Map)
Find public CCTV locations in any Korean neighborhood on a free map of about 260,000 camera sites, and what to do if one is missing.
ViewconeAndroid Flashlight Permission: Does setTorchMode Need CAMERA?
No. On Android 6.0+, CameraManager.setTorchMode turns on the flashlight without CAMERA permission. Here is why some apps still ask.
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