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Kharita Challenges
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Two abstract data sheets join over polygon cells, with opposing strokes indicating signed change.

Make geographic policy maps defensible

Rates, missingness, raster evidence, outliers and signed change: turn public geospatial data into maps that a policy reader can question and an analyst can reproduce.

Cartography

Steps
6
Each assumes the one before it
Time
~5.5 h
At the problems' own estimates
XP
1,980
Before hint costs and speed bonuses
Progress
0/6
Start the pathBegins with Normalise the map before you shade it

What you will be able to do

Join and audit country and raster data, choose honest denominators and visual ranges, retain outliers behind a disclosed display cap, and deliver a mapped policy finding with its source limits explicit.

The sequence

Each step assumes the one before it.

  1. Up nextNormalise the map before you shade itUp nextTurn a count into a rate: population per square kilometre for every country, with the area measured rather than looked up.beginnerDifficulty: beginner140 XP~25 min
  2. 2Classify a map where most of the values are zeroQuantile breaks collapse on a distribution dominated by zeros. Measure how, on the river-kilometres-per-country table, and say what a map maker should do instead.advancedDifficulty: advanced290 XP~45 min
  3. 3Accept the rasters, or send them backThe checks a data manager runs on delivered rasters before anyone analyses them: extent, nodata, value range, and whether the figures are plausible for the place.intermediateDifficulty: intermediate200 XP~35 min
  4. 4Which boroughs have the least tree cover?Zonal statistics on a categorical raster: the share of tree-cover pixels inside each borough polygon, for a tree-planting programme's targeting.intermediateDifficulty: intermediate230 XP~40 min
  5. 5Show country CO2 change without losing the outlierJoin two WDI observations to country polygons, preserve the true change, and cap only the display value.advancedDifficulty: advanced500 XP~85 min
  6. 6Defend a borough greening shortlistProjectMeasure canopy and summer vegetation on their own grids, then add low-ground context and apply one transparent shortlist rule.advancedDifficulty: advanced620 XP~110 min

Where it leads

Cartography is examined in the Policy map evidence screen, which issues the Kharita Certified Policy Mapping Analyst (Associate) (KPMA-A1). The problems here are the practice; the assessment is the same kind of problem, under time.