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Acid sulphate soils

The "Happamat sulfaattimaat" (acid sulphate soil) map service contains survey data on the properties and locations of acid sulphate soils in the entire coastal region of Finland, up to the approximate location of the highest shoreline of the ancient Littorina Sea. Users can view general maps of the probable presence of acid sulphate soils and survey-point specific information based on drilling and analysis results (pdf).

The maps describing probable areas of the presence of acid sulphate soils (regional data) are presented as maps at the scale of 1:1,000,000 (preliminary analysis map) and 1:250,000. The map level at the scale of 1:1,000,000 has been compiled by using a multivariate analysis of the spatial data software (ArcGIS). It utilises GTK soil and airborne geophysical materials and the Land Survey of Finland's elevation data materials. Actual observation data of acid sulphate soils was only available for analysis for certain regions. The map at the scale of 1:1,000,000 is meant to give a preview of acid sulphate soils and display an evaluation of the occurrence of acid sulphate soils in the entire coastal area of Finland. This material is not suitable for viewing specific points/states of the areas at a large scale. The map level at the scale of 1:250,000 was produced by interpreting GTK's soil and airborne geophysical materials, the Land Survey of Finland’s base map and elevation data, and catchment area-specific field surveys conducted by GTK. The map level at the scale of 1:250,000 provides a general view of the occurrence of acid sulphate soils at the catchment area-specific (main distribution) level. This material is not suitable for viewing specific points/states of the areas at large scale. The map level at the scale of 1:1,000,000 covers the entire coastal region of Finland, up to the approximate location of the highest shoreline of the ancient Littorina Sea. The map level at the scale of 1:250,000 covers only a part of the coastal region. The material is being updated one catchment-area at a time, as the survey progresses.

The “Havaintopisteet” (observation points) material included in the map is related to the map at the scale of 1:250,000. The observation points are drilling points that have been further classified as mapping and survey points. The survey points have more analysis and observation data, and their location has been chosen in a way that the description and properties of the soil profile represent the properties of acid sulphate soils on a wide area. The mapping points only indicate whether or not acid sulphate soils are present. Survey points in the service also include scorecards that show a cut-away drawing of the soil profile at the drilling point and the results of pH and laboratory analyses. The survey point data provides more accurate location-specific data on the occurrence and properties of acid sulphate soils in the areas included in the map at the scale of 1:250,000. The material is being updated one catchment-area at a time as the survey progresses.

The maps of the map service are meant to be used at the specified scale, and the visibility of the levels in the service has been restricted, according to the scale. The map at the scale of 1:1,000,000 cannot be viewed at a scale smaller than 1:1,000,000, and the material at the scale of 1:250,000 cannot be viewed at a scale smaller than 1:100,000. There are no limitations on the visibility of the observation points.

A map covering the entire coastal region of Finland should be complete by the end of 2020.

Materials used:

• GTK's survey data on acid sulphate soils (© GTK)
• Administrative divisions, base map data (© National Land Survey of Finland)
• Catchment areas, groundwater areas (© Finnish Environment Institute)
 
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Happamat sulfaattimaat