# Analyzing OpenStreetMap Road Data and Characterizing the Behavior of Contributors in Ankara, Turkey

^{*}

## Abstract

**:**

## 1. Introduction

## 2. Study Description

#### 2.1. The Study Area and OSM Road Data Structure

#### 2.2. Evaluation Methods

^{2}in each administrative area. In this study, new or updated road data contributed by volunteers is assumed to be an activation. A contributor who carried out at least one activation is labelled as an active contributor. The activation density is the ratio of the number of active contributors per km

^{2}. The area used in this calculation represents the activation area. Each area size was determined as the convex hull bounding new or updated road data in each year (grey polygons in Figure 2).

## 3. Evaluation of OSM Road Data and Results

## 4. Conclusions

## Author Contributions

## Funding

## Conflicts of Interest

## References

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**Figure 4.**The ratio of motorway roads (MR) (

**a**) and residential roads (RR) (

**b**) to all roads (AR): downtrend and uptrend lines (blue).

**Figure 5.**Distributions of degree of centrality (blue), PageRank (red) (

**a**), closeness (orange) and betweenness (green) (

**b**).

**Figure 6.**The number of active contributors (AC) (

**a**), the ratio of new-updated nodes (N) to AC (

**b**) and new-updated ways (W) to AC (

**c**) and all stacked (AS) (

**d**).

2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | |
---|---|---|---|---|---|---|---|---|---|---|---|

Number of roads | 1706 | 2766 | 2519 | 3890 | 2195 | 1776 | 37910 | 3834 | 6416 | 16990 | 10070 |

Length of new roads (km) | 1413.7 | 2486.6 | 2185.5 | 3146.8 | 2026.2 | 1947.9 | 11472 | 2955.6 | 3164.4 | 6979.3 | 4223.6 |

Mean length (m) | 828.7 | 899.0 | 867.6 | 808.9 | 923.1 | 1096.8 | 302.6 | 770.9 | 493.2 | 410.8 | 419.4 |

$\text{}\frac{\sum L}{\sum A}$ | 1.010 | 1.776 | 1.561 | 2.248 | 1.447 | 1.391 | 8.194 | 2.111 | 2.260 | 4.985 | 3.017 |

Temporal completeness (%) | 57 | 114 | 69 | 155 | 104 | 17 | 388 | 93 | 45 | 165 | - |

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**MDPI and ACS Style**

Hacar, M.; Kılıç, B.; Şahbaz, K. Analyzing OpenStreetMap Road Data and Characterizing the Behavior of Contributors in Ankara, Turkey. *ISPRS Int. J. Geo-Inf.* **2018**, *7*, 400.
https://doi.org/10.3390/ijgi7100400

**AMA Style**

Hacar M, Kılıç B, Şahbaz K. Analyzing OpenStreetMap Road Data and Characterizing the Behavior of Contributors in Ankara, Turkey. *ISPRS International Journal of Geo-Information*. 2018; 7(10):400.
https://doi.org/10.3390/ijgi7100400

**Chicago/Turabian Style**

Hacar, Müslüm, Batuhan Kılıç, and Kadir Şahbaz. 2018. "Analyzing OpenStreetMap Road Data and Characterizing the Behavior of Contributors in Ankara, Turkey" *ISPRS International Journal of Geo-Information* 7, no. 10: 400.
https://doi.org/10.3390/ijgi7100400