Steps to use MongoDB Atlas
- Open the MongoDB Atlas Cloud from here.
- Create the account by choosing the package suitable for you (You may also choose the free version which will be enough for this article and for learning purpose).
- Click on the Cluster view positioned at the left menu bar.
- Click on the Ellipses button
(...)and select Load Sample Dataset. - After the sample dataset is added then click on the connect button.
- Then whitelist the IP address (choose your current IP address or type the 0.0.0.0/0 IP for allowing it to access from everywhere. Click the button shown in the below image.
- Then click connect to applications button.
- Copy the cluster_uri and paste it to a “course_cluster_uri”.
Below is the implementation.
import pymongo
import pprint
import matplotlib.pyplot as plt
from mpl_toolkits.basemap import Basemap
course_cluster_uri = 'your_connection_string'
course_client = pymongo.MongoClient(course_cluster_uri)
# sample Database
db = course_client['sample_geospatial']
# sample Collection
shipwrecks = db['shipwrecks']
l = list(shipwrecks.find({}))
lngs = [x['londec'] for x in l]
lats = [x['latdec'] for x in l]
# Clear the figure (this is nice if you
# execute the cell multiple times)
plt.clf()
# Set the size of our figure
plt.figure(figsize =(14, 8))
# Set the center of our map with our
# first pair of coordinates and set
# the projection
m = Basemap(lat_0 = lats[0],
lon_0 = lngs[0],
projection ='cyl')
# Draw the coastlines and the states
m.drawcoastlines()
m.drawstates()
# Convert our coordinates to the system
# that the projection uses
x, y = m(lngs, lats)
# Plot our converted coordinates
plt.scatter(x, y)
# Display our beautiful map
plt.show()
Output:
shipwrecks plot
Geospatial Queries with Python MongoDB
GeoJSON is an open-source format containing simple geographical features and is based on JavaScript Object Notation. It is used to format shapes in a coordinate space and multiple types are supported by MongoDB to permit storing geospatial data. This article will cover the various ways of using geospatial in MongoDB and explain the GeoJSON polygon and point types.
Prerequisites: MongoDB and Python
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