Summary of 2010 Mapping Technology Workshop, WOC

Mapping Technology Workshop
27 September 2010
Use of data from laser scanning for
orienteering maps
•A summary of presentations from the 14th International
Conference on Orienteering Mapping 2010, Trondheim,
Norway, AO Uppill, Orienteering Australia Mapping Officer, 27 Sept 2010
•A laser data application on OCAD
Acknowledgements
Danish laser experiences – Flemming Norgaard
Latvia laser experiences – Janeta Turka
Automatic derivation – Laszlo Zentai
Swedish laser experiences – Tord Hederskog
OCAD – Gian-Reto Schaad
ISOM200X – Thomas Gloor
Mapping for WOC, Norway – Per Einar Pedersli
Mapping Technology Workshop
27 September 2010
Orienteering mappers are quick to take up new technologies
( ISOM200X p )
Mapping Technology Workshop
27 September 2010
LIDAR Light Detection and Ranging
•
(Danish p7)
Measures distance to an object using laser pulses
Mapping Technology Workshop
27 September 2010
What can be extracted from LIDAR
(Swedish p7)
Mapping Technology Workshop
Contours
27 September 2010
(Swedish p8)
Mapping Technology Workshop
Vegetation height
27 September 2010
(Swedish p9)
Mapping Technology Workshop
Vegetation density
27 September 2010
(Swedish p10)
Mapping Technology Workshop
Hill shading
27 September 2010
(Swedish p11)
Mapping Technology Workshop
Vectorisation
27 September 2010
(Swedish p13)
Mapping Technology Workshop
27 September 2010
Automation
• laser data to ‘O’ symbols
(Swedish p14)
Mapping Technology Workshop
27 September 2010
Compilation of ‘O’ BASE MAP by:
• Professional provider
• Mapper using OCAD
(Swedish p15)
Mapping Technology Workshop
27 September 2010
Generalisation principle
(Danish p49)
• Generalisation of LIDAR contours in the field by the mapper is essential
• Avoid automatic ‘smoothing’ nb LIDAR contours not imported into Map file
Mapping Technology Workshop
27 September 2010
OCAD
• Limited processing of raw laser data possible in OCAD10
• Further processing & application under development
Mapping Technology Workshop
27 September 2010
Common practice using LIDAR
(Danish p16)
• Orthophotograph or digital photograph + LIDAR contours
Mapping Technology Workshop
27 September 2010
Common practice using GPS
• Base map + GPS tracking
(Danish p16)
Mapping Technology Workshop
27 September 2010
Automation of LIDAR data to orienteering symbols
(Austrian presentation)
A case study in Austria found:
• Contour lines have a high degree of accuracy for
orienteering maps
• Some linear features ie roads, rock faces, earth walls
- geometric accuracy is high
- classification may be moderate to uncertain
• Some point features ie boulders, pits, depressions
- geometric accuracy is high
- classification may be uncertain to nil
• ‘Runnability of forests’ might be derivable in the future
• Automation development currently at infancy stage
- but used by some O mappers where data easily accessible
Mapping Technology Workshop
27 September 2010
LIDAR experience in Latvia
(Austrian p20)
• Verification in the field is required for point features
Mapping Technology Workshop
27 September 2010
LIDAR experience in Latvia (Latvian presentation)
LIDAR use has led to:
• An increase in the number of maps made per year
- but with out a corresponding increase in map making
knowledge & skill
• A decrease in the level of Generalisation
- to much detail ie too many form lines,
- map ‘oversaturated with objects’, cluttered
- can not read the map ‘on the run’
• An increase in the use of map scales at 1:7500
– due to reduced map legibility at 1:15000 / 1:10000
– and a change to orienteering itself
Mapping Technology Workshop
27 September 2010
Oversaturated map detail
(Latvian p19)
Mapping Technology Workshop
27 September 2010
Building a Base map from LIDAR data
• An example from Trondheim plus terrain walk
• ‘information overload’
Mapping Technology Workshop
27 September 2010
OCAD can be used to build a Base map from LIDAR data
• Terrain walk: Gian-Reto Schaad, OCAD
Mapping Technology Workshop
27 September 2010
Conclusions
• LIDAR data is now widely used for orienteering
map making ie used for WOC 2010, Norway
• LIDAR improves the accuracy of contours,
especially in dense forest areas
• LIDAR contours + digital aerial photography is
commonly used
• LIDAR derived data can create ‘information
overload’ for the mapper
• LIDAR may not actually save time
• Generalisation principle critical to maintain map
legibility at 1:15000