A small German firm offers a unique service to the country's construction industry: It uses historical British and American aerial photography from World War II air strikes to determine the location of unexploded bombs. Thousands of tons of bombs still lie in the soil and the duds are becoming more dangerous.
The photos usually show a "before" and "after" view of a raid, with images taken just days or weeks apart. Where wartime analysts used machines called stereoscopes to look at the images in 3-D,
Luftbilddatenbank technicians use digital software. They can then spot craters -- an indication that a bomb exploded -- and dark pinpoint holes, which suggest a dud that might still be buried under the surface.
一家德國小公司提供建築行業獨特的服務：使用從二次世界大戰空襲時期，英國和美國的歷史航空照片，以確定未爆炸的炸彈的位置。戰後數十年仍躺在土壤底下成千上萬噸的炸彈和未爆彈變得愈加危險。
利用襲擊前後相差數天(週)同地區不同時間拍的航片，組成立體像對
。戰時分析師使用橋式立體鏡，
Luftbilddatenbank 技術人員則使用軟體以3D立體方式觀察
，可判讀炸彈爆炸後的跡象(類似隕石坑 ) 和黑孔，這表示可能有啞彈仍埋在地表下。
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Source: German Firm Uses Aerial Photos to Find Bombs
