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A. Jesse Jiryu Davis
#MongoDBWorld
The Weather of the Century!
Part III:!
Visualization
Senior Python Engineer, MongoDB
Serious MongoDB Talk
Serious MongoDB Talk
Database
Serious MongoDB Talk
This Talk
Where’s the data from?
Where’s the data from?
How Much Is There?
Deployment
Visualization
Visualization Pipeline
MongoDB PyMongo NumPy Matplotlib
Python
dicts
SciPy
import numpy!
import pymongo!
!
data = []!
db = pymongo.MongoClient().my_database!
!
for doc in db.collection.find(query):!
data.append((!
doc['position']['coordinates'][0],!
doc['position']['coordinates'][1],!
doc['airTemperature']['value']))!
!
arrays = numpy.array(data)!
# NumPy column access syntax.!
lons = arrays[:, 0]!
lats = arrays[:, 1]!
temps = arrays[:, 2]!
from scipy import griddata!
from matplotlib import pyplot!
!
xs = numpy.linspace(-180, 180, 361)!
ys = numpy.linspace(-90, 90, 181)!
zs = griddata(lats, lons, temps,!
(xs, ys),!
method='linear')!
!
pyplot.contour(xs, ys, zs)!
Magic!!
Also magic!!
from matplotlib import pyplot!
!
xs = numpy.linspace(-180, 180, 361)!
ys = numpy.linspace(-90, 90, 181)!
zs = griddata(lats, lons, temps,!
(xs, ys),!
method='linear')!
!
pyplot.contour(xs, ys, zs)!
Triangulation
Triangulation
What temperature?
Triangulation
Barycentric Interpolation
What temperature? 53
48
54
Weighted Average
51.1
Interpolation
51.1
Interpolation
Interpolation
Contours
Contours
import numpy!
import pymongo!
!
data = []!
db = pymongo.MongoClient().my_database!
!
for doc in db.collection.find(query):!
data.append((!
doc['position']['coordinates'][0],!
doc['position']['coordinates'][1],!
doc['airTemperature']['value']))!
!
arrays = numpy.array(data)!
Not terrifically fast
Analyzing large datasets
• Querying: 109k documents per second
• (On localhost)
• Can we go faster?
• Enter“Monary”
MongoDB PyMongo NumPy Matplotlib
Python
dicts
MongoDB Monary NumPy Matplotlib
Monary
by David Beach
import monary!
!
data = []!
connection = monary.Monary()!
!
arrays = monary_connection.query(!
db='my_database',!
coll='collection',!
query=query,!
fields=['lon', 'lat', 'temp'],!
types=[!
'float32', 'float32', 'float32'])!
Monary
• PyMongo: 109k documents per second
• Monary: 817k documents per second
Visualization
{!
ts: ISODate("1991-01-01T00:00:00Z"),!
position: {!
type: "Point",!
coordinates: [!
-94.6,!
39.117!
]!
},!
airTemperature: {!
value: 45,!
quality: "1"!
}!
}!
Original Schema
{!
ts: ISODate("1991-01-01T00:00:00Z"),!
lon: 39.117,!
lat: -94.6,!
temp: 45!
}!
Target Schema
Future of Monary
• Author:

David Beach
• Interns:

Kyle Suarez

Matt Cotter
• Mentors:

A.Jesse Jiryu Davis

Jason Carey
Future of Monary
• Subdocuments:
"airTemperature.value"
• Aggregation cursor
• Packaging
• Bugfixes
• Python 3
Thanks
• Monary
• NumPy
• SciPy
• Matplotlib
Thanks
Thank you
#MongoDBWorld
A. Jesse Jiryu Davis
Senior Python Engineer, MongoDB

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The Weather of the Century Part 3: Visualization