Skip to content
Kharita Challenges

Problems

Real geospatial problems, graded automatically. Choose a track, a level and what you want to hand in.

1 of 59 problems

Pick one for me
Track
Spatial Analysis0 problemsPostGIS / SQL0 problemsPython0 problemsRemote Sensing0 problemsCartography1 problemWeb GIS1 problemData Management0 problemsGIS Architecture0 problems
Level
Beginner1 problemIntermediate3 problemsAdvanced2 problemsExpert0 problems
Hand in
SQL0 problemsPython0 problemsGeoJSON0 problemsAnswers1 problemSchema0 problemsDecisions0 problemsDataset file0 problems
Category
Data preparation0 problemsData quality0 problemsSpatial analysis0 problemsRaster analysis0 problemsCartography0 problemsDecision support0 problemsGeospatial systems0 problemsWeb delivery1 problem
Sign in to track progress
Web GISBeginnerWeb deliveryClear all
  1. Not started, How many tiles does an offline London need?Web deliveryAnswers

    From a bounding box to a tile count: size the offline basemap for a field app across zoom 10–15.

    Web GISbeginnerDifficulty: beginner140 XP~25 min3 checks

    You hand in your answers as values.

    Dataset

    • London boroughs · Polygon · 33 features · EPSG:4326

    What you’ll do

    • Take the bounding box of the borough layer
    • Convert box corners to tile coordinates at each zoom
    • Count tiles per zoom and total them into a storage estimate
    XYZ tilesWeb Mercatorofflinecapacity planningLondonAlso trains Cartography
    Open problem