Maaperän yleiskartta

The Superficial deposits of Finland 1:200 000 (sediment polygons) is suitable for use at a general scale (medium scale) in land-use planning, in the mapping and inventory of the natural resources of land areas, in environmental management, in agriculture and forestry and in education as well as in scientific and applied research. The scale of use of the map data set is 1:100 000-1:250 000.

Maa- ja elintarviketalouden tutkimuskeskus

Maanmittauslaitos

Metsäntutkimuslaitos

In producing the new general Superficial deposits of Finland 1:200 000 (sediment polygons), the following have been used as a background data: small scale 1:400 000 and 1:1 000 000 superficial deposits maps, the digital terrain database of the National Land Survey of Finland (NLS), 1:250 000 waterway elements, a digital elevation model, land parcel soil type data, VMI points (VMI = National Forest Inventory), the rock exposure observations of GTK, the rock exposure observations of Outokumpu Oy, low altitude aerogeophysical data sets, peat research points, a rock aggregate database and various available superficial deposits sets and geomorphological interpretations.

The general superficial deposits mapping process consists of generalisation of the base map, the gathering of reference material, preliminary interpretation, field mapping as well as data set completion and checking. In preparing the base map by generalising 1:20 000/1:50 000 and 1:100 000 superficial deposits maps, stone field polygons, open bedrock polygons, peat area polygons and classified mire polygons in the terrain database were joined to form one base map layer. In the new production process the mapping area was interpreted before field data were collected. In fieldwork, a probing rod and a spade were used for sediment identification. Most field observations were made close to a road network while in Northern Finland off-road routes were also used. The field observations were entered into a field computer. The sediment polygons were finalised and checked in the office. Finally, the field observations, sediment type labels, sediment polygon boundaries and sediment polygons were entered into the GTK database, in which sediment polygons were joined to form one seamless map layer. The clipping layer used for the map data set was a 1:200 000 map sheet division in accordance with the ETRS89 system (JHS 154).

The general superficial deposits mapping process consists of generalisation of the base map, the gathering of reference material, preliminary interpretation, field mapping as well as data set completion and checking. In preparing the base map by generalising 1:20 000/1:50 000 and 1:100 000 superficial deposits maps, stone field polygons, open bedrock polygons, peat area polygons and classified mire polygons in the terrain database were joined to form one base map layer. In the new production process the mapping area was interpreted before field data were collected. In fieldwork, a probing rod and a spade were used for sediment identification. Most field observations were made close to a road network while in Northern Finland off-road routes were also used. The field observations were entered into a field computer. The sediment polygons were finalised and checked in the office. Finally, the field observations, sediment type labels, sediment polygon boundaries and sediment polygons were entered into the GTK database, in which sediment polygons were joined to form one seamless map layer. The clipping layer used for the map data set was a 1:200 000 map sheet division in accordance with the ETRS89 system (JHS 154).

In the general superficial deposits mapping, the geographical information systems (GIS) software packages ArcInfo and ArcView were used initially to process spatial data. Later ArcGIS 9.1-9.3 software was used almost exclusively. Additionally, the processing of the geophysical data sets used various programmes tailored to the material in question. GPS equipment was used in recording field observations.

In producing the new general Superficial deposits of Finland 1:200 000 (sediment polygons), the following have been used as a background data: small scale 1:400 000 and 1:1 000 000 superficial deposits maps, the digital terrain database of the National Land Survey of Finland (NLS), 1:250 000 waterway elements, a digital elevation model, land parcel soil type data, VMI points (VMI = National Forest Inventory), the rock exposure observations of GTK, the rock exposure observations of Outokumpu Oy, low altitude aerogeophysical data sets, peat research points, a rock aggregate database and various available superficial deposits sets and geomorphological interpretations.

Maaperä 1:200 000 (maalajit)