Mapwarper is an open source map geo-rectification, warping and georeferencing application. It enables a user to upload an image, a scanned map or aerial photo for example, and by placing control points on a reference map and the image, to warp it, to stretch it to fit.
The application is a web based crowdsourced geospatial project that enables people and organisations to collaboratively publish images of maps online and digitize and extract vector information from them.
Users rectify, warp or stretch images of historical maps with a reference basemap, assigning locations on image and map that line up with each other. Often these historical maps were in big paper books, and so for the first time they can be stitched together and shown as a whole, in digital format.
Users can crop around the maps, and join them together into mosaics (previously called layers).
By georeferencing the images, they can be warped or georectified to match the locations in space, and used in GIS software and other services. One such use of these warped maps is an application that that helps people digitize, that is, trace over the maps to extract information from them. For example, buildings in 18th Century Manhattan, details changing land use, building type etc. This application is called the Digitizer.
The application runs as a Ruby on Rails application using a number of open source geospatial libraries and technologies, including PostGIS, Mapserver, Geoserver, and GDAL tools.
The resulting maps can be exported as a PNG, GeoTIFF, WMS, Tiles, and KML for use in many different applications.
Groups of maps can be made into "mosaics" that will stictch together the composite map images.
- Upload image by file or by URL
- Find and search maps by geography
- Adding control points to maps side by side
- Crop maps
- User commenting on maps
- Align maps from similar
- Create mosaics from groups of maps
- Login via Github / Twitter / OpenStreetMap / Wikimedia Commons
- OR signup with email and password
- Export as GeoTiff, PNG, WMS, Tile, KML etc
- Preview in Google Earth and Google Maps
- User Groups
- Map Favourites
- Social media sharing
- Bibliographic metatadata creation and export support
- Multiple georectfication options
- Control point from files import
- Admin tools include
- User statistics
- Activity monitoring
- User administration, disabling
- Roles management (editor, developer, admin etc)
- Batch Imports
Note on code and branches
Unmaintained branches exist for older systems and setups
- Rails 2.3 and Ruby 1.9.1 - See the ruby1.9.1 branch
- Rails 2.3 and Ruby 1.8.4 - See the rails2 branch
Ruby & Rails
- Rails 4.1.x
- Ruby 1.9
- Postgresql 8.4 (or 9.1)
- Postgis 1.5 (may work with 2.0)
Check out the Vagrant section lower down in the readme if you want to get started quickly.
on Ubuntu 14.04 LTS
apt-get install -y ruby ruby-dev postgresql-9.3-postgis-2.1 postgresql-server-dev-all postgresql-contrib build-essential git-core libxml2-dev libxslt-dev imagemagick libmapserver1 gdal-bin libgdal-dev ruby-mapscript nodejs
Due to a bug with the gdal gem, you may need to disable a few flags from your ruby rbconfig.rb see https://github.com/zhm/gdal-ruby/issues/4 for more information
Then install the gem files using bundler
Create and configure the following files
In addition have a look in
config/initializers/application_config.rb for some other paths and variables, and
config/initializers/devise.rb for devise and omniauth
Create a postgis database
psql mapwarper_dev -c "create extension postgis;"
Creating a new user
user = User.new user.login = "super" user.email = "email@example.com" user.password = "your_password" user.password_confirmation = "your_password" user.save user.send(:activate!) role = Role.find_by_name('super user') user = User.find_by_login('super') permission = Permission.new permission.role = role permission.user = user permission.save role = Role.find_by_name('administrator') permission = Permission.new permission.role = role permission.user = user permission.save
Via Vagrant - There is a vagrantfile you can use this uses a provision script in lib/vagrant. Type
to get and install the virtual machine - this will also install the libraries and depencies and ruby gems for mapwarper into the virtual machine. See the file in lib/vagrant/provision.sh for more details about this process
After that runs, type vagrant ssh to login and then you can
cd /vagrant rails c
Create a user in the console, as shown above and then exit
to start the server, running on port 3000
The system can use capistrano for deployment
See README_API.md for API details