Spatial Mongo and Node.JS on Openshift JS.Everywhere 2012
This document summarizes a presentation about building spatial web services using MongoDB and Node.js. It includes an agenda that covers loading spatial data into MongoDB, performing queries, and sharing a code repository. The presenter assumes the audience has basic knowledge of Node.js, MongoDB, and using the command line. They then explain what OpenShift is and what resources it provides. The bulk of the presentation focuses on demonstrating how to add spatial indexing and querying capabilities to MongoDB, including indexing coordinates and performing near and containment queries. The presenter concludes by stating spatial functionality is easy to integrate with MongoDB and that attendees can now build applications like Foursquare or field data systems using these techniques.
![How to make it work
1) Put your coordinates into an arrary
{ loc : [ 50 , 30 ] } //SUGGESTED OPTION
{ loc : { x : 50 , y : 30 } }
{ loc : { foo : 50 , y : 30 } }
{ loc : { lon : 40.739037, lat: 73.992964 } }
2) Make a 2d index
db.places.ensureIndex( { loc : "2d" } )
14](https://image.slidesharecdn.com/spatialmongonode-121026124903-phpapp02/85/Spatial-Mongo-and-Node-JS-on-Openshift-JS-Everywhere-2012-14-320.jpg)
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Spatial Mongo and Node.JS on Openshift JS.Everywhere 2012
- 1. Building Spatial Web Services with MongoDB + NodeJS in Less than 30 Minutes Steven Citron-Pousty PaaS Dust Spreader, Red Hat @TheSteve0 1
- 2. Agenda • Learn a little spatial • Load some spatial data into mongo • Do a query or two • Repo for today’s code is here – https://github.com/openshift/openshift-mongo-node- express-example SIGN UP CODE: jseverywhere 2
- 3. Assumptions 1) You already know that Node.JS + Mongo is like chocolate and peanut butter 2) You can use the command line 3) You are comfortable with Mongo command line 4) Please ask questions – though since we only have 30 minutes they may have to wait until the end or after the session 3
- 4. What is OpenShift? Red Hat’s free platform as a service for applications in the cloud. 4
- 5. 5 Dalbera on Flickr
- 6. Kind of like Amazon, right? Nope. 6
- 7. Cook24v on Flickr 7
- 8. 8
- 10. There’s more? What’s the catch? • OpenShift is free-as-in-beer & free-as-in-freedom • Three 512 MB RAM / 1 GB storage gears • Need more resources, just ask! • We are really in Developer Preview 10
- 12. Spatial is fun The only spatial functionality Mongo currently has is: 1) Near 2) Containment All of it is laid out on one page: http://www.mongodb.org/display/DOCS/Geospatial+Inde xing First link on a google search for “mongodb spatial indexing” 12
- 13. Caveats 1. Assumes coords. are between -180 and 180 2. Can handle any 2D coordinates 3. Has methods to handle curvature of the earth (spherical) 13
- 14. How to make it work 1) Put your coordinates into an arrary { loc : [ 50 , 30 ] } //SUGGESTED OPTION { loc : { x : 50 , y : 30 } } { loc : { foo : 50 , y : 30 } } { loc : { lon : 40.739037, lat: 73.992964 } } 2) Make a 2d index db.places.ensureIndex( { loc : "2d" } ) 14
- 15. Demo 1. I have an Node.JS app and a mongo instance running 2. Load some spatial data in JSON format 3. Make the 2d index 4. Do some fun spatial and MongoDB work 5. Show you the web services 15
- 16. Conclusion 1. Spatial is easy and fun on Mongo 2. You can now build your own FourSquare or other checkin application. 3. You can also build your own field data entry system. 4. You can build and deploy your application quickly without having to think about infrastructure. SIGN UP CODE: jseverywhere http://openshift.redhat.com 16