In Borges' one-paragraph fable, an empire's cartographers grow their map until it is as large as the empire itself, and nobody can use it. This map of Frankfurt's squares goes down to 1 m. Does that detail help, or only weigh?
The values are felt temperature (UTCI) from a SOLWEIG radiation model at 1 m × 1 m, hour by hour, for Frankfurt's Altstadt and Innenstadt during the 24–28 June 2026 heatwave (own project, "Frankfurt Platz Heat"). This map shows the hottest day, 27 June, 07:00–23:00 summer time.
The 10 m and 100 m maps are not new models: they are the same 1 m result averaged into 10 × 10 and 100 × 100 m blocks (a block needs at least a quarter of its area in the open; buildings and the river are left out). So every difference you see between the three maps is what averaging hides, nothing else.
UTCI classes: 26–32 °C moderate, 32–38 strong, 38–46 very strong, above 46 °C extreme heat stress.
Limits: provisional DWD weather from the airport station, one air temperature for the whole area; differences are driven by sun, shade, sky view and surfaces. Not validated with measurements in Frankfurt. Aerial photo: © HVBG Hessen (DOP20), fallback Esri. Buildings: ALKIS. Squares: ATKIS/ALKIS AX_Platz. By Barış Parlatangiller, built with Claude. Code & data · All 30 maps