[Osmf-talk] Notes & Bing Imagery

Pierre Béland infosbelas-gps at yahoo.fr
Sun Dec 8 09:57:42 UTC 2013

Hi Oleksiy,

It is sometimes hard to interpret the imagery without knowing the area you map. While in Limonade,  north of Haiti this spring, we observed that there are many house constructions. People build structures and sometimes wait for months to complete the construction.  Sometimes, there is already a first floor, and the owners have prepared the structure, the walls to build a second floor.

If you look at Limonade, there is no destruction but in fact many house construction.

For example, if you select in JOSM the UAV imagery and locate Limonade, you will see many of these houses.
Select in JOSM CTRl+J, and give the following url 

If we compare Bing and UAV imageries for Limonade, we can see how useful it was to have this more recent imagery to trace the new buildings.


 De : Oleksiy Muzalyev <oleksiy.muzalyev at bluewin.ch>
À : Pierre Béland <infosbelas-gps at yahoo.fr>; "osmf-talk at openstreetmap.org" <osmf-talk at openstreetmap.org> 
Envoyé le : Samedi 7 décembre 2013 9h37
Objet : Re: [Osmf-talk] Notes & Bing Imagery

Hi Pierre,

Thank you for the information.

I could distinguish some people and cars on this aerial imagery from the
elevation of 150 meters, but they are completely unrecognizable.

I guess from the approx. 100 meters altitude, recommended by
regulations, it will be about the same. It is important for privacy.

I watched the video on the web-page and noticed that during these six
days there were clouds and wind (moving tree branches) in Haiti. The
team arrived for the six days visit and had to fly no matter what.

Still the quality of the imagery is amazing. I tried to map with it,
mapped a soccer pitch near Minustah Camp
http://osm.org/go/YeQzpQehl--?m= , which is on the Drone imagery, but
not on satellite's.

Haiti is a particular case, as there is a lot of destruction in urban
areas. It would be interesting to create a similar test project in an
usual city.

Even if during one flight we take only 1 - 10 square kilometers of
imagery, the area of an average city is 200 - 300 square kilometers. So
it is hard, but doable.

And we can weight for a calm sunny day for flying. I mean there will be
less vibration of the drone camera on a quiet day, so the quality of
photos will be better, and the risk of a crash is less.

I understand that the aerial imagery layer created in this way could be
copyrighted © OpenStreetMap contributors, as the map itself, and shown
to map users.

Not only for adding notes, but even if someone wants to see an aerial
view of a certain place. There could be a button on the map - switch to
aerial view.

The imagery for the whole city could be created once, and then only
districts, where there are changes, like construction of new buildings,
roads, etc. are updated.

O.M. (Alex-7)

On 06.12.2013 16:28, Pierre Béland wrote:
> ... The average flight elevation was 150
> meters, which gives a precision of about 4cm. ...

>> http://www.droneadventures.org/2013/05/29/haiti/
>> In JOSM WMS-TMS Preferences, in the Imagery providers list, look for HT
>> Imagerie de drone, Haiti (ie UAV imagery fo Haiti).  Look for Limonade,
>> Haiti. You will see very impressive results. ...
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