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Organizations invest resources to gather geographical information about cities or neighborhoods. This can help governments or companies identify needed services or city improvements. However, collecting this information can be difficult and expensive. In this study we investigate ways to motivate local crowds to serve as the world's sensors and provide geographical data about their surroundings. We conduct interviews and a pilot study to understand whether we can motivate people to contribute data about their neighborhoods via games or for the greater social good of helping the neighborhood. Our results provide a glimpse of how people feel about donating neighborhood data given different motivators; they also provide insight into the amount of data people are willing to contribute. We conclude by discussing possible design implications of our findings.

The IEEE Symposium on 3D User Interfaces 2010 has run its first 3DUI Grand Prize, a contest for innovative and practical solutions to classic 3DUI problems. This paper describes the rationale of this first contest, an analysis of all submissions, and details about solutions from winners in the two categories. INTRODUCTION1 The first 3D user interfaces (3DUIs) were created during the 60s, and since then there has been active research on novel input devices, novel ways to visualize information, or novel ways to manipulate such information [2,4]. 3DUIs can be found in Virtual Reality applications [5,10] in a wide variety of domains, from games to health care solutions, from the oil and gas industry to car design. However, there is a rich set of devices that can be used to manipulate 3D information, and endless approaches for mapping input events to actions inside an application. The community of the IEEE Symposium on 3D User Interfaces (3DUI), co-located with the IEEE Virtual Reality Conference, gather annually to discuss novel advances and results in this field. This year, the 3DUI Symposium has created another method to show those advances, the 3DUI Grand Prize.The goal of the 3DUI Grand Prize is to show common practices and advances in this field, by means of a competition around a problem that reflects our state of the art. We 2 want both to show how much has been done in this field and to encourage contestants to be innovative and passionate about the possibilities of 3DUIs. We want to recognize achievements and common knowledge, while at the same time underline innovations and novel approaches. In general, we believe a contest could be another way to show the 1 original published by IEEE Computer Graphics and Applications 2 As otherwise stated, we is used to refer to the organizers of the contest. This paper describes this first experience and reflects on the future of the contest. First, we describe the rationale of the selected problem and an overview of submissions. Later, we describe in detail winner solutions in the two categories of the contest. Finally, we present a discussion on the results and some conclusions. SIDE NOTE: WEB LINKSThe following are some web links related to this contest:• The 3DUI 2010 Grand Prize: http://conferences.computer.org/3dui/3dui2010/cfp/contest.html• The 3DUI 2010's Channel at YouTube, with all the video submissions: http://www.youtube.com/user/ 3DUI2010#g/c/21451B298805BC09• Mail archive for the contest: http://listes.lost-oasis.net/?A=LIST&L=3duigrandprize2010 nowan.fr CONTEST AND PROCEDURESFor this first installment of the 3DUI contest, we decided to favor similarity to reality and simplicity in the evaluation process over more abstract scenarios that could lead to more subtle and precise evaluations, but at the same time require more preparation. As one of the organizers put it, we wanted to "mimic real problems that people [in industry] using 3D are facing". We did not know neither how many contestants will accept the challenge, so we had to simplify the work ...