Color and Texture Interpolation between Imagery and Vector Data

Color and Texture InterpolationBetween Orthoimagery and Vector Data

Charlotte Hoarau, Sidonie ChristopheGeoVIS - ISPRS GeoSpatial Week - Thursday, October 1srt 2015

CONTEXT and CHALLENGES

Hybrid visualization between maps and imagery

3C. Hoarau, S. Christophe GeoVIS – ISPRS GeoSpatial Week

Long term purpose

Modelisation of the cartographic style

Style navigation between cartographic representations

→ Design method to create Cartographic Continuum

Topographic Map Imagery

Design challenges

Create efficient hybrid visualizations

→ Avoid global image blending by transparency

→ Understand the perception of conveyed information

→ Create smooth transition to help cognitive tasks(such as feature recognition, territory comprehension, etc.)

Heterogeneous visual perception

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Abstract representation of the real world

“All maps are abstractions of the reality”

[Robinson et Al. 95]

Information is identified, interpreted, structured and hierarchised

Abstraction steps in the cartographic process

Data selection

Data generalization

Data symbolization

Topographic map perception

Imagery perception

Realistic representation from the sky

Photo-realism effect

Automated acquisition

Continuous representation

Non encoded information

Increased credibility in a “ground truth”

Difficult to interpret as “raw” data

Question research

Orthoimagery Topographic map

How to merge them into an hybrid visualization ?

How to create visual and progressive transitions ?

METHODOLOGY

Visual properties interpolation

Mixing imagery and vector data

VectorCartographic

Database

RasterImagery

Database

HybridVisualization

Merging visual properties : Color and Texture

From the map : bright colors (conventional or abstract)

From the imagery : natural textures and colors

Procedural rendering methods

Methodology

Determining pivot

symbolizations

Pivot symbolization

Using endings visual properties

Pivot symbolization

Using endings visual properties

Methodology

Determining pivot

symbolizations

Interpolating

Symbolization

parameters

Color interpolation

Applied to the hydrography

Map color Natural color

Raster Color Interpolation

Applied to buildingsgs

Natural texture interpolation

Plain color Transparent color

Procedural texture interpolation

Applied to the vegetation

Procedural texturePlain color

How to choose pivot symbolizations ?

How to combine parameter interpolations ?

Interpolation parameterization

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How to synchronize cartographic themes ??

Imagery Map

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Interpolation parameterization

Using the perceived realism level

Interactive online user test

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The texture is more relevant to control the realism level

Validation of one interpolation combination

Main results on realism perception

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CARTOGRAPHIC RESULTS

Realism-Abstraction Continuum

Continuum design

Color Interpolation Texture Interpolation

Continuum design

Color Interpolation Texture Interpolation

Cartographic Continuum

Style IGN Style OSM

Style IGN Style OSMStyle IGN Style OSM

Style IGN Style OSM

CONCLUSION and PERSPECTIVES

Hybrid visualization between maps and imagery

Cartographic continuum design

Interpolating color and texture properties allows to create smooth graphic transitions

→ How to evaluate the evolution of the perception by merging representations ?

Integration of continuum in multiplexing tools

→ How to support specific cognitive tasks ?

Interaction with cartographic continuum

Color and Texture InterpolationBetween Orthoimagery and Vector Data

Charlotte Hoarau, Sidonie ChristopheGeoVIS - ISPRS GeoSpatial Week - Thursday, October 1srt 2015

Color and Texture Interpolation between Imagery and Vector Data

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