The MapRoulette Blog

New MapRoulette Challenge to verify level_crossing tagging correctness

Published: (Updated: ) in Challenge by .

This is a guest post by Alex Iannicelli and Yunzhi Li from Facebook. Throughout the United States there are many places where railways intersect with highways to create “Level Crossings”. Representing these intersections in OSM correctly can improve renderings and routing algorithms. To help improve these intersections we recently created a MapRoulette challenge to verify level_crossing […]

Guest Post: Tracing Reservoirs in the USA

Published: in Uncategorized by .

This post was written by OSM and MapRoulette user Brian M. Sperlongano, who also created the Project this post talks about. Did you know that there are tens of thousands of potentially unmapped reservoirs in the USA? An early import from the Geographic Names Information System (GNIS) added a massive numbers of reservoirs, however, these […]

Tips For Solving MapRoulette Tasks In A Small Area

Published: (Updated: ) in Tutorial by .

MapRoulette is designed to let you map wherever the tasks are. This means that, depending on the Challenge, you can be mapping in Indonesia one minute, and in South Africa the next. We think this is part of what makes MapRoulette fun! But sometimes, you may want to just stay in a specific area. MapRoulette […]

Using Overpass to create Challenges

Published: (Updated: ) in Tutorial by .

This post also appears on the MapRoulette Learn web site. You will find many more resources there to get the most out of MapRoulette, including how-tos, screencasts and reference documentation. Overpass is a powerful query language for OSM. You can ask it things like “Show me all water fountains in Rome” or “Show me banks […]

MapRoulette Throwback Monday: The Remap-A-Thon

Published: in Random by .

Did you know that MapRoulette started out as The OpenStreetMap US Remap-A-Thon? There was only one Challenge: to repair the road network in the United States after OpenStreetMap changed its data license from Creative Commons to the Open Database License. Mapping data from contributors who did not agree to this change, or could not be […]

Adding directionality to stop signs in MapRoulette

Published: in Challenge by .

The highway=stop tag is the OSM representation for a stop sign like this: They are often placed on the intersection node of two ways, if there is a stop sign in all directions (a four-way stop). There are plenty of situations where the an intersection only has a stop sign in certain directions. In that […]

What If I Can’t Fix A MapRoulette Task?

Published: (Updated: ) in Tutorial by .

Most MapRoulette tasks are designed to be easy to fix, but a lot depends on the person who designed the Challenge you are working on, and the data that is available to fix the task. For example, there may not be good enough quality aerial imagery available at the task location, making it impossible to […]

OSMCha ❤️ MapRoulette

Published: (Updated: ) in Uncategorized, by .

OSMCha is a well known OSM changeset inspection and validation tool. It lets you look at changesets through different lenses. You can filter by individual mappers, geographic locations, mapping teams, and a variety of flags that are automatically applied to changesets, like ‘possible import’, ‘profanity’ and ‘outdated tags’. Using a combination of filters, you can […]