The new data available at HAKKU-service by GTK

The new spatial data products have been published during 2018. Feel free to get familiar with the newest data
at HAKKU-service (

Stratum data for superficial deposits
The stratum data for superficial deposits is based on the observation database of superficial deposit. The stratum data for superficial deposits product comprises general information about the observation site, sequence of strata interpretation/ strata data of the superficial deposit, and the boundary layers of strata in relation to drilling, sounding, test pits, sections and probing points.

Glacial features
The glacial features dataset shows Finland’s glacial features. The features dataset includes e.g. eskers, deltas, interlobate and marginal deposits, drumlins, flutings, transverse moraine deposits, hummocky moraine, littoral deposits and erosional crescent throughs and erosional valleys classified as through valleys. In the future the data set will cover whole Finland.

Construction conditions of superficial deposits
The interpretation of construction condition characteristics is formed using superficial deposit data, estimated thicknesses of fine-grained sediments and a slope data calculated from elevation model. Classification and datasets of construction condition maps varies according to the processing history.

Glaciofluvial deposit modelling
Glaciofluvial deposit modelling -data contains interpolated models (bedrock and groundwater surfaces, digital elevation model) and thickness calculations based on above-mentioned models (aquifer thickness, thickness of seepage water zone and thickness of overburden).

Bedrock surface from gravity interpretations
The data consists of bedrock topography, which is interpreted of results of gravity measurements.

Quality of well waters
The data are based on measurements and analysis results from groundwater of ”1000 wells” and ”500 wells” -projects covering the entire nation. The statistical variables in the concentrations and properties of the well waters have been calculated from the data separately for the downloadable product. The coordinates are not included.

Bedrock weakness zones
The bedrock weakness zones is an interpretation of the linear fragmented structures of the bedrock of Helsinki at a scale of 1:50 000. The weakness zones are classified according to construction suitability class.

Bedrock structural interpretation 1:100 000
This data set present structural interpretation with time aspect. The data set contain hierarchical fault lines from the Bedrock of Finland 1:200 000 divided into age categories. In the future the data set will cover whole Finland.

Geoenergy Potential of Bedrock in Finland 1:1 000 000
The geoenergy potential dataset comprises two raster maps that provide computational estimates of (1) the thermal energy stored in the bedrock, and (2) the renewable heating power of the bedrock that are extractable from a 300-m deep borehole. The maps show the areal availability and variation of the geoenergy potential of the bedrock.

Groundwater energy potential
The data describes theoretical heating power which can be sustainably utilised from Finnish classified aquifers under urban or other active land use. Heating power calculations are based on the average groundwater temperatures from the years 2000 to 2007 and estimated natural recharge value, i.e. the maximum sustainable yield, of classified aquifers under active land use.

Seabed substrate 1:1 000 000 and 1:100 000
Seabed substrate 1:1 000 000 is produced in the EMODnet (European Marine Observation and Data network) Geology EU project and Seabed substrate. Seabed substrate 1:100 000 is produced in the EMODnet Geology III EU project. The project collects and harmonizes geological data from the European sea areas to support decision-making and sustainable marine spatial planning. These products includes the EMODnet seabed substrate map from the Finnish marine areas.

Hanna Virkki, Geological Survey of Finland