Crowdmapping is a subtype ofcrowdsourcing^[1][2] by whichaggregation of crowd-generated inputs such as captured communications andsocial media feeds are combined withgeographic data to create adigital map that is as up-to-date as possible^[3] on events such aswars,humanitarian crises,crime,elections, ornatural disasters.^[4][5] Such maps are typically created collaboratively by people coming together over theInternet.^[3][6]

The information can typically be sent to the map initiator or initiators bySMS or by filling out a form online and are then gathered on a map online automatically or by a dedicated group.^[7] In 2010,Ushahidi released "Crowdmap" − afree and open-source platform by which anyone can start crowdmapping projects.^{[8][9][10][11][12]}

Crowdmapping can be used to track fires, floods,pollution,^[6] crime, political violence, the spread of disease and bring a level of transparency to fast-moving events that are difficult fortraditional media to adequately cover, or problem areas^[6] and longer-term trends and that may be difficult to identify through the reporting of individual events.^[5]

During disasters the timeliness of relevant maps is critical as the needs and locations of victims may change rapidly.^[3]

The use of crowdmapping by authorities can improvesituational awareness during an incident and be used to supportincident response.^[6]

Crowdmaps are an efficient way to visually demonstrate the geographical spread of a phenomenon.^[7]

• HealthMap is a freely accessible, automated electronic information system in operation since 2006 that monitors, organizes, and visualizes reports of global disease outbreaks according to geography, time, and infectious disease agent that also crowdsources user data.^[13][14][15]
• 2007–08 Kenyan crisis^[16][17][8]
• In the2010 Haiti earthquake the Ushahidi crowdmapping platform was used to map more than 3584 events in close to real time, including breakout of fires and people trapped under buildings.^{[18][16][3][4][19]}
• The Humanitarian OpenStreetMap Team organizes volunteers to rapidly updateOpenStreetMap in areas of natural disasters, since 2010. Worldwide volunteers useaerial andsatellite photography to increase the level of detail in regional maps, frequently within a few days of the crisis, while on-site disaster relief workers provide relevant information such as where buildings and roads have been destroyed or repaired.^[20]
• One week after theFukushima Daiichi nuclear disaster in 2011 theSafecast project was launched that loaned volunteers cheapGeiger counters to measure locallevels of radioactivity (or volunteers purchased their own device). This data was mapped and made publicly available through their website.^[6]
• Hurricane Irene in 2011^[21][22]
• In 2012 the Danish daily newspaper and online titleDagbladet Information mapped the positions of surveillance cameras by encouraging readers to use a free Android and iOS app to photograph and geolocateCCTV cameras.^{[23][better source needed]}
• In 2013, predict the reemergence ofcicada swarms,WNYC—a public radio station in New York City—asked residents of certain areas to use sensors to track the soil temperature. The crowd-reported temperatures were displayed on a map on WNYC’s website.^[2][24]
• April 2015 Nepal earthquake^{[25][26][27][28]}

• Geographic position
• Collaborative mapping
• Web mapping
• Emergency management

• CS1 errors: missing periodical
• CS1 French-language sources (fr)
• Webarchive template wayback links
• CS1 German-language sources (de)
• All articles lacking reliable references
• Articles lacking reliable references from January 2017