Aerial mapping company BlueSky Monday launched Point-Z, a
national database of land and building height measurements that
holds the height above sea level for any given point in Great
Britain. Point-Z comprises a grid of billions of survey points
collected every 5 meters or less using sophisticated remote sensing
technology. Height accuracy varies from less than 1 meter to as
little as 5 centimeters for selected areas such as high-risk flood
plains and coastal zones.
"We were setting all-time highs and all-time records a couple of
years back, but then 9/11 happened and the industry started having
problems. But recovery from all that has bottomed out and now we
are back on the increase."
Source: UAL Captain Kit Darby, in an interview
with the Chicago Tribune. Darby runs Aviation Information Resources
and is a frequent contributor to ANN.