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 Analysis1 problemPostGIS / SQL0 problemsPython0 problemsRemote Sensing0 problemsCartography0 problemsWeb GIS0 problemsData Management1 problemGIS Architecture0 problems
Level
Beginner0 problemsIntermediate0 problemsAdvanced1 problemExpert0 problems
Hand in
SQL0 problemsPython0 problemsGeoJSON1 problemAnswers1 problemSchema0 problemsDecisions0 problemsDataset file0 problems
Category
Data preparation1 problemData quality1 problemSpatial analysis4 problemsRaster analysis4 problemsCartography1 problemDecision support4 problemsGeospatial systems0 problemsWeb delivery0 problems
Sign in to track progress
Spatial AnalysisData qualityGeoJSONClear all
  1. Not started, Which big cities does the gazetteer not know?Data qualityGeoJSON

    Test one layer's completeness against another: large urban footprints with no populated place inside them at all.

    Data ManagementadvancedDifficulty: advanced300 XP~45 min5 checks

    You hand in a GeoJSON result.

    Datasets

    • Urban areas · Polygon · 2,143 features · EPSG:4326
    • Populated places · Point · 1,251 features · EPSG:4326

    What you’ll do

    • Measure footprint area in an equal-area projection and apply a size floor
    • Test each footprint for containment of any point from a second layer
    • Return the uncovered footprints with the area that says how much they matter
    completenessspatial joinequal-areagazetteerglobalAlso trains Spatial Analysis
    Open problem