UNCERTAINTIES OF COMPLETENESS MEASURES IN OPENSTREETMAP – A CASE STUDY FOR BUILDINGS IN A MEDIUM-SIZED GERMAN CITY

The completeness of buildings in OpenStreetMap (OSM) is estimated for a medium-sized German city and its surroundings by comparing the OSM data with data from an official building cadastre. As completeness measures we apply two unit-based methods that are frequently applied in similar studies. It is...

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Main Authors: T. Törnros, H. Dorn, S. Hahmann, A. Zipf
Format: Article
Language:English
Published: Copernicus Publications 2015-08-01
Series:ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Online Access:http://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/II-3-W5/353/2015/isprsannals-II-3-W5-353-2015.pdf
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spelling doaj-df20a1249643436fbc4dce8129eac6632020-11-24T22:06:38ZengCopernicus PublicationsISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences2194-90422194-90502015-08-01II-3-W535335710.5194/isprsannals-II-3-W5-353-2015UNCERTAINTIES OF COMPLETENESS MEASURES IN OPENSTREETMAP – A CASE STUDY FOR BUILDINGS IN A MEDIUM-SIZED GERMAN CITYT. Törnros0H. Dorn1S. Hahmann2A. Zipf3Chair of GIScience, Institute of Geography, Heidelberg University, Berliner Straße 48, 69120 Heidelberg, GermanyChair of GIScience, Institute of Geography, Heidelberg University, Berliner Straße 48, 69120 Heidelberg, GermanyChair of GIScience, Institute of Geography, Heidelberg University, Berliner Straße 48, 69120 Heidelberg, GermanyChair of GIScience, Institute of Geography, Heidelberg University, Berliner Straße 48, 69120 Heidelberg, GermanyThe completeness of buildings in OpenStreetMap (OSM) is estimated for a medium-sized German city and its surroundings by comparing the OSM data with data from an official building cadastre. As completeness measures we apply two unit-based methods that are frequently applied in similar studies. It is found that the estimation of OSM building completeness strongly differ between the methods. A count ratio (number of OSM buildings / number of reference buildings) tends to underestimate the actual building completeness and an area ratio (total OSM building area / total reference building area) instead tends to overestimate the completeness within the study area. It is argued that a simple pre-processing of the building footprint polygons leads to a more accurate completeness estimation when applying the count ratio. It is also suggested to more carefully examine the areas that have been mapped in OSM but not in the reference data set (false positives). In the present study region, these values are mainly due to simplified OSM polygons and they contribute to an overestimation of the OSM building completeness when applying the area ratio.http://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/II-3-W5/353/2015/isprsannals-II-3-W5-353-2015.pdf
collection DOAJ
language English
format Article
sources DOAJ
author T. Törnros
H. Dorn
S. Hahmann
A. Zipf
spellingShingle T. Törnros
H. Dorn
S. Hahmann
A. Zipf
UNCERTAINTIES OF COMPLETENESS MEASURES IN OPENSTREETMAP – A CASE STUDY FOR BUILDINGS IN A MEDIUM-SIZED GERMAN CITY
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
author_facet T. Törnros
H. Dorn
S. Hahmann
A. Zipf
author_sort T. Törnros
title UNCERTAINTIES OF COMPLETENESS MEASURES IN OPENSTREETMAP – A CASE STUDY FOR BUILDINGS IN A MEDIUM-SIZED GERMAN CITY
title_short UNCERTAINTIES OF COMPLETENESS MEASURES IN OPENSTREETMAP – A CASE STUDY FOR BUILDINGS IN A MEDIUM-SIZED GERMAN CITY
title_full UNCERTAINTIES OF COMPLETENESS MEASURES IN OPENSTREETMAP – A CASE STUDY FOR BUILDINGS IN A MEDIUM-SIZED GERMAN CITY
title_fullStr UNCERTAINTIES OF COMPLETENESS MEASURES IN OPENSTREETMAP – A CASE STUDY FOR BUILDINGS IN A MEDIUM-SIZED GERMAN CITY
title_full_unstemmed UNCERTAINTIES OF COMPLETENESS MEASURES IN OPENSTREETMAP – A CASE STUDY FOR BUILDINGS IN A MEDIUM-SIZED GERMAN CITY
title_sort uncertainties of completeness measures in openstreetmap – a case study for buildings in a medium-sized german city
publisher Copernicus Publications
series ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
issn 2194-9042
2194-9050
publishDate 2015-08-01
description The completeness of buildings in OpenStreetMap (OSM) is estimated for a medium-sized German city and its surroundings by comparing the OSM data with data from an official building cadastre. As completeness measures we apply two unit-based methods that are frequently applied in similar studies. It is found that the estimation of OSM building completeness strongly differ between the methods. A count ratio (number of OSM buildings / number of reference buildings) tends to underestimate the actual building completeness and an area ratio (total OSM building area / total reference building area) instead tends to overestimate the completeness within the study area. It is argued that a simple pre-processing of the building footprint polygons leads to a more accurate completeness estimation when applying the count ratio. It is also suggested to more carefully examine the areas that have been mapped in OSM but not in the reference data set (false positives). In the present study region, these values are mainly due to simplified OSM polygons and they contribute to an overestimation of the OSM building completeness when applying the area ratio.
url http://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/II-3-W5/353/2015/isprsannals-II-3-W5-353-2015.pdf
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AT shahmann uncertaintiesofcompletenessmeasuresinopenstreetmapndashacasestudyforbuildingsinamediumsizedgermancity
AT azipf uncertaintiesofcompletenessmeasuresinopenstreetmapndashacasestudyforbuildingsinamediumsizedgermancity
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