From the dataset abstract
Old detailed plans of Helsinki. The detailed plan maps for years 1820, 1838 and 1878 can be downloaded as TIFF-files. The guidemaps for all years can be found through WMS API. Previewing...
Additional information
| Field | Value |
|---|---|
| Format | WMS |
| Published | 16.03.2017 |
| Updated | 12.09.2019 |
| Coordinate system | ETRS-GK25 |