This dataset provides the orthophotographs of Helsinki in API from 2014, 2015, 2016, 2017, 2018 and 2019. CIR image is provided from 2015, 2017 and 2019. Additionally, photos from 1988, 1976, 1969, 1964, 1950, 1943 and 1932 are provided as image files.
Recent ortophotographs can be reached through WMS and WMTS APIs of the city of Helsinki.
The address of the WMS is: https://kartta.hel.fi/ws/geoserver/avoindata/wms.
The address of the WMTS is: https://kartta.hel.fi/ws/geoserver/avoindata/gwc/service/wmts.
Additional information about APIs of Helsinki (in Finnish):