标签:OpenStreetMap building buildings wayids api your
Buildings can be mapped in OpenStreetMap. Their shapes can be turned into 3D models for use in FlightGear scenery.
Challenges
- There are "just" 64 million buildings in OSM[1], most cities in the world have no buildings at all or just a few.
- Only 1.04% of the buildings in OSM have a height specified. Ca. 1.4% has a known number of floors (levels).[2]
- FlightGear cannot handle thousands of models in a view. Grouping models into bigger files improves performance to a very usable level, but is less practical unless automated.
From OpenStreetMap
A single building
- Find the building in OpenStreetMap.
- Enable the "Data" overlay.
- Choose a manual area and drag a box around your building.
- Click your building, the way id will be shown. Copy this id.
- Run the following code, replacing 44338398 with your building's id:
perl bob.pl -w 44338398
- Next to this basic code, there are several options, to be added behind the basic code.
- Lat/lon location of the model's origin:
-lat 52.00141 -lon 4.36966
- Object name (not the .ac name!):
-n "Empire State Building"
- Building height (in meters):
-h 15
- Note: buildings are always sunk 5 m into the ground, in order to account for non-flat terrain. These 5 meters are added on top of (or below, if you like) the building height.
- Create a xml file with a standard range animation:
-x
- Clean the shape by removing nodes that lie within a certain distance from the line that connects its two adjacent nodes. This results in much smaller files and allows more buildings to have a gable roof:
-clean
- Next to this basic code, there are several options, to be added behind the basic code.
All buildings in an area
Lower Manhattan at dawn.- Download a file with all data from the area, by visiting the following link and save it somewhere on your computer. This will only include buildings (building=yes) within the specified bounding box.
http://overpass-api.de/api/xapi?way[bbox=left,bottom,right,top][building=*][@meta]
- For example:
http://overpass-api.de/api/xapi?way[bbox=-74.02037,40.69704,-73.96922,40.73971][building=*][@meta]
- Get a list of wayids via
grep "<way" map.osm|cut -f2 -d\">wayids.txt
change the number after f where appropriate
orsed -n 's|<way.*id="\(.*\)" .*>|\1|p' "map.osm" > wayids.txt
- For Windows users: Run
for /f %a in (wayids.txt) do perl bob.pl -w %a -f map.osm
For others: Iterate through wayids.txt and assign each way id to $object and runperl bob.pl -w $object -f map.osm
on all the ids.
参考:https://wiki.flightgear.org/OpenStreetMap_buildings
标签:OpenStreetMap,building,buildings,wayids,api,your 来源: https://www.cnblogs.com/2008nmj/p/15692630.html
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