Slide 1
Slide 1 text
3D4EM
Validation of 3DTOP10NL
Hugo Ledoux
2015-11-11
User’s committee meeting, Utrecht
Slide 2
Slide 2 text
3D top10NL
2
Slide 3
Slide 3 text
No content
Slide 4
Slide 4 text
How good is it?
Slide 5
Slide 5 text
visible errors
Slide 6
Slide 6 text
construction = intricate workflow
6
ITC/Sander’s code
FME
+
ArcGIS
output
Slide 7
Slide 7 text
Now freely available online
7
http://www.arcgis.com/home/webmap/viewer.html?layers=15acccc56e6a462ab7b79a9d5c6d4933&useExisting=1
Slide 8
Slide 8 text
No content
Slide 9
Slide 9 text
No content
Slide 10
Slide 10 text
ALL triangles
are
duplicated
!
Slide 11
Slide 11 text
often big parts of tiles are missing
11
Slide 12
Slide 12 text
some classes are not triangulated
12
Slide 13
Slide 13 text
triangulation has several long and skinny triangles
13
Slide 14
Slide 14 text
Vertical triangles have often the wrong orientation
14
Slide 15
Slide 15 text
TOP10NL polygons are arbitrarily split
15
Slide 16
Slide 16 text
borders of top10nl tiles
16
Slide 17
Slide 17 text
ALL buildings are geometrically invalid
17
Slide 18
Slide 18 text
Some numbers
18
8,5% of regions
Slide 19
Slide 19 text
Are these errors a
problem for you?
Slide 20
Slide 20 text
They were for us!
Slide 21
Slide 21 text
3dfier
An open-source toolkit to
construct large 3D city models
Slide 22
Slide 22 text
No content
Slide 23
Slide 23 text
23
• open-source libraries used:
‣ liblas, GDAL, Boost.Geometry, Triangle
• scalable and fast (C++)
‣ our aim is to construct whole NL on our server
• configurable: any input would work (3DBGT!)
• valid output
Slide 24
Slide 24 text
No content
Slide 25
Slide 25 text
Far from finished
25