Cartonama Conference

Making the most of geospatial data, community mapping, and location-based services.

The ‘Where’ question is central to our everyday lives. Geospatial data shapes our ability to answer that question and build intelligent applications, whether on the web or on your mobile device.

Supported by contributions from crowd-sourced data projects and open source software, geo data and its technology spectrum has grown impressively in recent years. In the face of this massive and diverse range of spatial data and technologies, the ability to choose effective methods for storage, retrieval and visualisation becomes critical .

The Cartonama conference is about geographic data, the technology behind it, the applications built around it and the overarching aspect of community and mobility.

We will organize workshops along with the conference. The goal would be to provide hands-on training to collect, store and visualize geographic data, and finally, to build location-based services with these tools. Workshop theme falls into:

  • Nature of Geospatial Data: Structure, Formats and Operations
  • Collection, Storage & Delivery of Geospatial Data: Crowd-sourced Models, Standards and Databases
  • Location-based Services: Front-end and Back-end tools to build and manage your applications
  • Leveraging Open Geographic Data Repositories: Using OpenStreetMap to visualize and tell stories through maps

You can submit your workshop proposals via the submissions through the funnel below.

##Speaking submissions
You can submit a proposal to speak at Cartonama via the submission funnel below. Please describe your proposal in as much detail as possible. Detail is important if you’d like to be voted up into the schedule.

Your submission will be up for public voting for up to 2 weeks before the event. For the final tally, we will only consider votes from ticket holders, as a way to ensure participants get exactly what they pay for.

Making a funnel submission does not guarantee final selection. Selected speakers will get a free ticket to the event (limited to one speaker per proposal). Proposers whose talks are not on the final schedule will be able to purchase tickets at the prevailing rate for the day on which they made their proposal.

You can buy a ticket to the event here.

Hosted by

Cartonama is HasGeek’s conference on mapping and location-based services. more



Geohash System and "Nearby" searches

Submitted Aug 31, 2012

An introduction to Geohash system of spatial data structure, few applications of it like Also, to get understanding on geohash system can improve your applications “nearby” searches.


Geohash is a lat/long geocode system which divides space into
buckets of grid shape. The system offers arbitrary precision and gradual removal of characters loses precision. As a result, the methodology has “nearby” places have similar prefixes.

The method was majorly developed to easily denote a unique location in emails, forums etc using a short link which is exposed as a webservice in

In the talk, I plan to briefly touch upon basics of Geohash system, how it works and some popular opensource libraries which expose the service. The performance benefits of doing operations with geohash system in comparison to conventional lat/long system will also be covered. I will also explain how we make use of geohash system in implementing nearby searches in our products @Ideophone, alongwith a small demo of an application developed internally.


Basic understanding of geographic coordinate system

Speaker bio

Co-Founder and Hacker @Ideophone. Loves to come up with interesting hacks and build scalable web-applications. At Ideophone, we develop mobile apps for Travelers. Our current set of apps have over a lakh users and are gaining good traction.


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Hosted by

Cartonama is HasGeek’s conference on mapping and location-based services. more