Geospatial queries basics in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to find documents near a point using $near.

MongoDB

db.places.find({ location: { $near: { $geometry: { type: "Point", coordinates: [1] } } } })

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A40, -70

B[40, -70]

C{40, -70}

D["40", "-70"]

Attempts:

3 left

💡 Hint

Common Mistakes

Using strings instead of numbers for coordinates.

Using curly braces instead of square brackets.

Not wrapping coordinates in an array.

The coordinates must be an array of numbers representing longitude and latitude.

2fill in blank

medium

Complete the code to find documents within a polygon using $geoWithin.

MongoDB

db.parks.find({ area: { $geoWithin: { $geometry: { type: "Polygon", coordinates: [1] } } } })

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A{[0,0],[3,6],[6,1],[0,0]}

B[[0,0],[3,6],[6,1],[0,0]]

C[[[0,0],[3,6],[6,1],[0,0]]]

D[0,0,3,6,6,1,0,0]

Attempts:

3 left

💡 Hint

Common Mistakes

Using single array instead of nested arrays for polygon coordinates.

Not closing the polygon by repeating the first point at the end.

Using curly braces instead of square brackets.

The coordinates for a polygon must be an array of linear rings, so an array inside an array.

3fill in blank

hard

Fix the error in the query to find documents near a point with max distance.

MongoDB

db.stores.find({ location: { $near: { $geometry: { type: "Point", coordinates: [ -73.97, 40.77 ] }, $maxDistance: [1] } } })

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A1000

B"1000"

C[1000]

D{1000}

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of a number for $maxDistance.

Using an array or object instead of a number.

Omitting $maxDistance or placing it incorrectly.

The $maxDistance value must be a number, not a string or array.

4fill in blank

hard

Fill both blanks to find documents within a circle using $geoWithin and $centerSphere.

MongoDB

db.locations.find({ position: { $geoWithin: { $centerSphere: [ [1], [2] ] } } })

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A[ -73.97, 40.77 ]

B40.77

C0.01

D[ -73.97, 40.77, 0.01 ]

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the radius inside the coordinates array.

Using latitude before longitude in coordinates.

Using degrees instead of radians for radius.

The first blank is the center point as an array of coordinates. The second blank is the radius in radians.

5fill in blank

hard

Fill all three blanks to find documents near a point with min and max distance.

MongoDB

db.places.find({ location: { $near: { $geometry: { type: "Point", coordinates: [1] }, $minDistance: [2], $maxDistance: [3] } } })

Drag options to blanks, or click blank then click option'

A[ -73.97, 40.77 ]

B500

C2000

D[ 40.77, -73.97 ]

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping latitude and longitude in coordinates.

Using strings instead of numbers for distances.

Omitting $minDistance or $maxDistance.

The coordinates must be longitude then latitude. $minDistance and $maxDistance are numbers in meters.