Wednesday 22nd May, 2013
11:30am to 12:00pm
Have you ever received a dataset and not known what projection the geodata is in? Download a CSV full of ‘x’ and ‘y’ and have no idea how to determine if they are UTM, State Plane, or some other obscure projection? We are here to help!
CUGOS (Cascadia Users of Geospatial Open Source), a very active OSGeo regional chapter, has been hacking on a project to help solve this problem. We have been sponsoring hack sessions and using this project as a learning tool for CUGOS members to engage in Open Source Geospatial software development.
Give us a sample of your unknown data (an x and y from your dataset) and a hint as to where you think it is (i.e. you know the data is related to ‘Seattle WA’) and we will give you back a list of probable projections. There are interesting cases at all scales, with capabilities to get you ‘close’ at large scales, and distinguish datum differences at very small scales. We use some simple techniques leveraging the EPSG database, PostGIS, and a simple web map interface to make the user experience as easy as possible.
All of the project source code is available on Github and we are using a great list of Open Source projects to make ProjFinder work including Flask, PostGIS and Openlayers. We are hosting the client app on git-pages, and the API on a small Linode, once again showing that big things can be accomplished with scarce resources.
We will be introducing the concept, showing ProjFinder in action, and talking about using projects like this to engage your local community around Open Source Geospatial. Hopefully you will leave inspired to come hack ProjFinder with us and engage your local community in developing similar learning opportunities.
Chop Shop Geo
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