Data and code for: Oversampling sets the convergence rate of fine-grid TROPOMI NO2 maps over a tropical coastal city

Derived data, analysis results, processing code and final figures for the manuscript "Oversampling sets the convergence rate of fine-grid TROPOMI NO2 maps over a tropical coastal city", submitted to Forum Geografi. The study quantifies how many daily satellite overpasses are needed before a fine-grid nitrogen dioxide map becomes reliable, and compares three gridding routes on an identical 0.01 degree lattice over Surabaya, Indonesia. CONTENTS - data/ : daily tropospheric NO2 column in mol m-2 on a 35 x 20 grid of 700 cells of 0.01 degree, for the 96 consecutive days from 2026-07-01 to 2026-10-04. Missing cells are stored as JSON null and the file is strict JSON. - results/ : 11 JSON files holding every numerical result reported in the manuscript and its tables, including the reliability curves, the paired significance tests, the cell-size crossover test and the cost measurements. - scripts/ : 15 Python files, comprising the analysis pipeline, the figure scripts, the core oversampling libraries (area-weighted tessellation and physical super-Gaussian response), and verify_from_grid.py, a standard-library-only script that reproduces the coverage statistics quoted in the manuscript and prints PASS or MISMATCH. - figures/ : the five manuscript figures at 650 dpi. - MANIFEST.csv : SHA-256 checksum and byte size of every file. SCOPE AND LIMITATIONS The TROPOMI level-2 granules are not re-hosted here. They are publicly available from the Copernicus Data Space Ecosystem at https://dataspace.copernicus.eu/ and amount to about 60 GB for the 96 days. A full rerun of the level-2 routes requires those granules, while the archived daily grid supports independent checks of coverage and of the level-3 route. Two result files, tiga_metode_96.json and ANGKA_FINAL.json, came from a run that also required Earth Engine authentication and cannot be regenerated from this deposit alone. LICENCES AND ATTRIBUTION Data and results are released under CC BY 4.0. Code is released under the MIT licence. Derived products contain modified Copernicus Sentinel data 2026. RELATED PUBLICATION Jaelani, L. M. (2026). Oversampling sets the convergence rate of fine-grid TROPOMI NO2 maps over a tropical coastal city. Forum Geografi, submitted.