Geographical studies of outdoor activities have increased in recent years with the rise popularity these worldwide, including Japan. Volunteered geographic information (VGI) is a key tool for organizing as it offers means to determine locational and names places. To evaluate quality VGI, geospatial data generated by land survey agencies other VGI are often utilized reference data. However, sinc...

This paper presents several innovative sociotechnical systems currently deployed in some Southern cities, which enable urban citizens to produce and disseminate Volunteered Geographic Information (VGI) about their water and sanitation services. What happens to this information once online? The literature review reveals that actual uses of VGI remain relatively unstudied. A comparative and multi...

The number of crisis events around the world has been increasing in the last years and suggests there is a real need to make communities more resilient to them. In addition to providing conventional authoritative data, ordinary citizens and residents in the affected areas are also voluntarily supplying information about the affected areas, in what has been called Crowdsourced or Volunteered Geo...

The quality of volunteered and crowd-sourced spatial data is not in most cases audited prior to being made accessible to end-users. Studies have shown that this spatial data varies significantly in terms of its geometric quality, its semantic consistency, in terms of its comprehensiveness of coverage and in terms of its currency. Subsequently it often compares poorly with the authoritative data...

رویکرد باززنده‌سازی در عرصۀ حفاظت از میراث معماری نیازمند شناسایی و احصای همۀ ارزش‌های مرتبط با اثر است، اما فرایند به تأثیرگذاری جغرافیای طبیعی بر شکل‌گیری اندیشۀ انسان برای خلق آن، ‌عنوان مکانی، کمتر توجه شده است. ضعف شناخت تبیین این ارزش‌ها سبب دست رفتن محیط اثرگذار نابودی یکپارچگی زمینه‌اش می‌شود. سوی دیگر، معماری، علاوه ‌بر مرتبط، تداوم بستر زمان نیز ضروری پژوهش، هدف ارتقای دانش ارزش‌گذاری...

Digital Earth is a powerful metaphor for the organisation and access to digital information through a multi-scale 3D representation of the globe. Progress made since Al Gore's speech gave a concrete body to this vision. However, this body is not yet self-aware: a better integration of the temporal and voluntary dimension is needed to better portray the event-based nature of our world. We thus a...

Volunteered Geographic Information (VGI), or geospatial crowdsourcing, is where citizens (volunteers) contribute data and information about the earth and environment that is explicitly or implicitly georeferenced and then disseminated via collaborative projects such as OpenStreetMap or social media such as Flickr, Twitter, and Facebook. VGI popularity is due in no small part to citizens making ...

This paper describes how Volunteered Geographic Information (VGI) can support automatic information retrieval (IR) from big remote sensing (RS) data on an example of the Global Human Settlement Layer (GHSL)[1]. Here, the OpenStreetMap 1 (OSM) derived data are used within a satellite imagery processing framework at several stages of an information layer production. Although, we focus on built-up...

As mobile devices, access to geographical information, and migration from web 1.0 to web 2.0 advance, users started playing the role of consumers, producers, and communicators. As a result, several internet systems have spawned that collect Volunteered Geographical Information (VGI). VGI collection systems often need to be developed within short timeframes. This paper presents a comparative ana...

More than 400000 vascular grafts are inserted annually in the USA. Graft insertion is complicated by infection in 0.5-4% of cases. Vascular graft infections (VGIs) are becoming one of the most frequent prosthesis-related infections and are associated with considerable mortality, ranging from 10 to 25% within 30 days following the diagnosis. Treatment of VGI is based on urgent surgical removal o...