@rajrsinghWatson Data Platform

Using Geospatial Datain Cloudant & CouchDB

February, 2017

@rajrsinghWatson Data Platform

WhyGeospatial?

• Humans are wired by evolution to think spatially

• Location tells you a lot about your data

• Design with Nature (1969) pioneered the concept of ecological planning. Ian McHarg sets forth the basic concepts that were to develop later into geographic information systems. Courtesy Wikipedia

@rajrsinghWatson Data Platform

Faking GeowithCouchDB

• Secondary index on X and Y• Mango query X and Y• Pull data to the client, then…

• Use PouchDB + https://github.com/pouchdb/geopouch for bounding box queries

or

• http://turfjs.org for more complete geospatial analysis

@rajrsinghWatson Data Platform

Components of a great mobile mapping app Basemap tiles: Mapbox

API Query: all restaurants X meters from Y that serve Z

Web client: MapboxGL

Custom data: restaurants

@rajrsinghWatson Data Platform

Going Beyond the Bounding Box

@rajrsinghWatson Data Platform

Multipoint Polygons

@rajrsinghWatson Data Platform

GeoJSON Data Format

– geometry property• required: type property with a value such as

Point, LineString or Polygon• required: coordinates property

– properties property• all the other data• optional in Cloudant/CouchDB

– type property set to Feature

– http://geojson.org

@rajrsinghWatson Data Platform

GeoQueries

– base URL /<db>/_design/<ddocname>/_geo/<geoindexname>?

– bounding box bbox=minlon,minlat,maxlon,maxlat

– radiuslat=39.96&lon=-75.15&radius=300&relation=contains

polygonrelation=overlaps&g=POLYGON ((-71.0537124 42.3681995,-71.054399 42.3675178,-71.0522962 42.3667409,-71.051631 42.3659324,-71.051631 42.3621431,-71.0502148 42.3618577,-71.0505152 42.3660275,-71.0511589 42.3670263,-71.0537124 42.3681995))

@rajrsinghWatson Data Platform

Spatial Relationship Types

BBox ContainsCrosses Disjoint Equals

IntersectsOverlaps Touches Within

@rajrsinghWatson Data Platform

CrimeStats

http://crimedemos.mybluemix.net/?city=boston

@rajrsinghWatson Data Platform

FieldWork

https://fieldwork.mybluemix.net

@rajrsinghWatson Data Platform

SafetyPulse

https://safetypulse.mybluemix.net

@rajrsinghWatson Data Platform

Resources • Location Tracker tutorials• https://developer.ibm.com/clouddataservices/location-tra

cker/

• Cloudant Geo• Marketing overview

https://www.ibm.com/analytics/us/en/technology/location-based-apps/

• Technical docs https://docs.cloudant.com/geo.html

• Me• Twitter @rajrsingh• Email rrsingh@us.ibm.com