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Content
Objectives and restrictions Background: Manually drawn rock depictions Principles and elements Method
Process of automation Data Generation Outcome Problems
S EMI -A UTOMATED R OCK D EPICTION M ETHODS FOR L ARGE S CALE T - - PowerPoint PPT Presentation
S EMI -A UTOMATED R OCK D EPICTION M ETHODS FOR L ARGE S CALE T - - PowerPoint PPT Presentation
S EMI -A UTOMATED R OCK D EPICTION M ETHODS FOR L ARGE S CALE T OPOGRAPHIC M APS Matthias Grnwald, Karel Kriz University of Vienna, Department of Geography and Regional Research, Cartography and GIS, Vienna, Austria Content Objectives and
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Objectives
Creating rock depiction primary from DEM Large scales (1 : 25.000 / 1 : 50.000) Semi-automated method Combination of automated processes and manual steps Based on principles and elements of known manual
methods
Restrictions No detection of edges and rock boundary Not trying to copy or reproduce
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Brenta 1:25.000 (Aegerter) ÖAV
Manually drawn rock depictions
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Manually drawn rock depictions
Ötztaler Alpen 1:25.000 (Ebster) ÖAV
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Manually drawn rock depictions
Gosaukamm 1:10.000 (Brandstätter) ÖAV
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Manually drawn rock depictions
Schweizer Landeskarte 1:25.000
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Principles and elements
- Horizontal and vertical lines / hachures
- Steep slopes: replace horizontal with vertical lines
(„Scharungsersatz“ - ÖAV Brandstätter)
- Drawing elements depending on slope value
- Shadow hachuring (Swiss Method)
- Variation of stroke depending on aspect
- „crumpled“ Lines
- Variation of color and patterns of all elements
- Rock boundary / relief edges ( manually added)
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Shadow hachuring
Hurni; 1998 Gilgen; 1998
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Steep slopes: Vertical hachures / lines
Gilgen; 1998
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Process of automation
Base data: DEM (10m) Generating Data
GIS functions (GDAL, Python)
„Cartographic depiction “
Manipulation of graphic variables
(→ Line patterns, styles, colors)
Cartogr. tool (mapyrus)
Graphic revision, post-processing
Graphic library (ImageMagick)
Vector Raster Raster
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Process of automation
Data generation Cartographic depiction Graphic revision Rock depiction
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Data generation
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Data generation
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Webinterface
Slope Aspect
Color / Pattern
Templates
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Outcome
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Details
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Map Samples Veitsch-Nord
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Details
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Problems: Plain slopes
Different line patterns Adding (minor) edges or other relief elements / details
(gullies)
Similar problem with flat slopes
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ÖK 50