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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. Construction suitability class is an interpretation derived from a variety of datasets and depicts possible occurrences of characteristics that have detrimental impacts on construction suitability. The attribute data also includes grounds for interpretation and the data source. Some of the weakness zone interpretations include GTK’s survey observation point(s). Their codes and the observed fault structure type are included in the attribute data. Using the code (OBSERVATION_ID / Havaintotunnus) observation data can be found from the GTK bedrock observations.
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