ELWP Tree Mapping – 6 Oct 2025

Cleaned dataset from the East London Waterworks Park (ELWP) perimeter walk,
collected on 6 October 2025 in collaboration with UCL MSc students.

The data were gathered as part of a practical field exercise and standardised for analysis and mapping.

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Files

File	Description
data/observations_clean_curated.csv	Main cleaned dataset (33 records, WGS84 lat/lon).
data/observations_clean_curated.geojson	Same data in GeoJSON format for GIS/web mapping.
docs/data_dictionary_min.csv	Field names, units, and short descriptions.

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Dataset summary

Each row represents a single observation — tree/shrub, vegetation patch, bird, or site issue —
recorded by UCL MSc students during the perimeter walk.

Key fields:

• observation_id – unique record ID (ELWP_UCL_###)
• method – tree / veg_patch / bird / issue
• species – species name (merged from list and free text)
• dbh_cm, est_height_m, canopy_diam_m – tree metrics
• cover_pct, sward_height_cm – vegetation metrics
• latitude, longitude – WGS84 coordinates
• notes – field notes and comments

See docs/data_dictionary_min.csv for full field details.

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Data cleaning & processing

• Combined Species and Species (free text, if not listed) into a single field,
  tracking provenance via species_source (list, free_text, missing).
• Removed KoBo system and student identifier fields.
• Standardised units (cm, m, %, DAFOR 1–5).
• Removed obvious entry errors (negative values, sward height > 300 cm).
• Added canopy_area_m2 from canopy diameter.
• Validated latitude/longitude (EPSG 4326) and removed invalid points.

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Licence

CC BY 4.0 — You may share and adapt with attribution.
© East London Waterworks Park and contributors (2025).

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Citation

East London Waterworks Park & Contributors (2025).
ELWP Tree Mapping – 6 Oct 2025 (v0.1).
CC BY 4.0. GitHub repository

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Notes

• Coordinates are approximate field GPS readings (EPSG 4326).