SLIDES:
ABSTRACT:
The quality of digital road maps plays a critical role in many GIS applica-
tions. For example, the next generation of automatic road user charge sys-
tems will need to be able to identify the road on which a vehicle is traveling
and report the total number of miles driven by a vehicle. This requirement
imposes a new challenge on the accuracy of digital road maps. Certainly,
failure to manage/evaluate errors in digital road maps may limit or invali-
date road user charge assessment. Most previous work on the evaluation of
the accuracy of digital road maps was focused on point-based approaches
and was not scalable to large road networks. In this paper, we present a
spatial framework for evaluating digital road map accuracy. First, we ap-
plied a buffer-based line-string colocation measure to select a field test site
in order to discover high affinity road patterns, i.e., roads located very close
together. This served two functions: (1) to determine the magnitude of the
problem and (2) to identify the location where map accuracy needs to be
evaluated. We then proposed a line-string based digital road map accuracy
measure that uses a well-defined buffer computation. Our experiments on a
Minneapolis-St. Paul base map demonstrate that our approach is applicable
to large road networks and is effective for assessing positional accuracy in
digital road maps. Further, we found that the accuracy of existing digital
road maps do not satisfy the requirements required for applications such as
road user charge systems. The fact is that current digital road maps were
not designed for road user charge systems and if used may lead to inaccurate
and unfair charges.
KEYWORDS:
Spatial Datasets, Accuracy, Digital Roadmaps.
ACKNOWLEDGMENTS:
This work was supported in part by
the Federal Highway Authority,
and the University of Minnesota (e.g. Center for Transportation Studies).
NOTE:
Some of the results discussed in this talk appeared
in the following publications:
-
S. Shekhar, X. Ma, H. Xiong, W. Wu, M. Donath, P. Cheng,
Digital Road Map Accuracy Evaluation: A Buffer-based Approach,
(
pdf
).
The joint meeting of The Fifteenth Annual Conference of The International Environmetrics Society
and The Sixth International Symposium on Spatial Accuracy Assessment in Natural Resources and
Environmental Sciences, 2004.
-
# P. Cheng, M. Donath, X. Ma, S. Shekhar, and Kenneth Buckeye Evaluation of Digital Maps for
Road User Charging Applications User Charge Systems ,
(
pdf
),
In submission to Journal of Transportation Research Board (TRB), 2005.
- P. Cheng, X. Ma, M. Donath, and S. Shekhar, Evaluation of National Differential Global
Positioning System (ND GPS) for Accessing Road User Charge Systems,
(
pdf
),
Journal of Transportation Research Board (TRB), 2004.