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Voxel GIS: Challenges and Opportunities

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(1)

13-12-2015

Challenge the future

Delft University of Technology

Voxel GIS: challenges and

opportunities

Sisi Zlatanova, Pirouz Nourian 3D Geoinformation

Department of Urbanism

(2)

Content

•

Voxels

•

Applications

• Outdoor • Indoor

•

Operations on voxels

•

Challenges

(3)

3

Voxels

Voxel

•

Basic characteristics (definition)

Discretized

homogenous

•

A voxel is a volume element. (3D “pixel”)

•

A 3D cubical (or spherical array), with each

element holding one (or more) data value

(boolean, real)

(4)

Other primitives

(5)

5

Voxel-based representation

(6)

6

National model:

Geological Formations

Hydrogeological model

: more detail

Detailed model: the upper 30-50 meter

(7)

7

Example: GeoTOP

• 3D subsurface model of the Netherlands: • Nation-wide model (~ 41,000 km2)

• Upper 30 meters

• Cell size 100 x 100 x 0.5 meters • Information per cell:

• Stratigraphical unit + uncertainty

• Lithology and sand grain-size classes + uncertainty

• Hydrological, physical and chemical properties • Model application:

• Groundwater and pollution management • Land subsidence studies

• Infrastructural issues

(8)

Climate data (hurricane Isabel)

(9)

9

Anne Frank Tree

3D GIS assignment Johan, Bremer

500/500/500

1000/1000/1000

2500/2500/2500

Colors with respect to the density of points

(10)

More threes

Ben Gorte, TUDelft

voxels

(11)

11

3D model of real world

(12)

Digital Dublin

Courtesy Tommy Hinks

(13)

13-12-2015

Challenge the future

Delft University of Technology

Minecraft

Simeon Nedkov http://blog.ndkv.nl/participatory-urban-planning-with-minecraft/

(14)

OTB building

(15)

15

points

(16)

30 cm grid

10 cm grid

(17)

17

(18)

voxels

walls

(19)

19

Distance map

(20)

Content

•

Voxels

•

Applications

• Outdoor • Indoor

•

Operations on voxels

•

Challenges

(21)

21

Operations with voxels

•

Voxel adjacencies:

•

N-path: a sequence of voxels is a

6-path, 18-pathof 26-path

•

Filtering

•

Iso-surface

(22)

Paths

(23)

23

Iso-surfaces, sections

(24)

RandstadRail (Underground)

0 500m

N Z

Clay & Loam Peat

Fine sand

Medium sand

Coarse sand Antropogenic & subsurface

(25)

25

(26)
(27)

27

Editing of data (second line)

(28)
(29)

29

In 2D

860x650 pixels

(30)

Challenges

•

Algorithms for rasterization

• Points, lines, surfaces, volumes

•

Resolution

• Walls, doors, object inside

•

Semantics

• Attributes

(31)

31

Rasdaman, Monet DB

(32)

Thank you for the attention!

Cytaty

Pobierz teraz ( PDF - 32 Stron - 4.07 MB )

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