[Talk-us] [OSM-talk] Old Aerodromes

[Wolfgang Zenker]

* Paul Norman <penorman at mac.com> [160412 17:27]:
> On 4/12/2016 2:40 AM, Christoph Hormann wrote:
>> On Tuesday 12 April 2016, Martijn van Exel wrote:
>>>> I was mapping some rural area in the U.S. and noticed, not for the
>>>> first time, an aerodrome node in the middle of a field where there is
>>>> obviously no airport or airfield.

>> I am not sure here.  For small airfields the aeroway=aerodrome feature
>> is a fairly abstract thing essentially indicating only that this is a
>> place where aircrafts start or land.  This is not generally something
>> that can be reliably determined from imagery.

> You can't reliably find small airfields from imagery, but I've found it 
> possible to verify a lack of airfields from it. I pass though 
> agricultural areas, and the airfields that are still active all appear 
> somehow on imagery, even if it's just an area where the ground cover is 
> different. On the other hand, some of the aeroway=aerodrome we have data 
> for include points in fields of corn, residential areas, and stands of 
> trees.

One added problem here is that the coordinates of imported data are
not always that good. As an example check Zortman Airport
http://www.openstreetmap.org/node/1042048666
The original import was more than half a mile off.

Wolfgang