Abstract

This paper intends, from a structural point of view, to analyse the network of Flickr’s members who live or were born in Spain. The aim of the study is to know how the network evolves, what is its shape, what groups are detected and what uses are carried out within the network. We identified 663 Flickr members through a double snowball process and harvested their joining date, photos and contacts with a crawler. The results show that the users who joined Flickr in 2004 use the service as a communication medium among amateur photographers, while the subsequent members utilise Flickr as a real social network, using the photos as a way to express personal experiences, opinions and tastes.

Abstract

International audience; The most common way to use geographic information is to make maps. With the ever growing amount of Volunteered Geographic Information (VGI), we have the opportunity to make many maps, but only automatic cartography (generalisation, stylisation, text placement) can handle such an amount of data with very frequent updates. This chapter reviews the recent proposals to adapt the current techniques for automatic cartography to VGI as the source data, focusing on the production of topographic base maps. The review includes methods to assess quality and the level of detail, which is necessary to handle data heterogeneity. The paper also describes automatic techniques to general-ise, harmonise and render VGI.