DTM 5X5 – Digital terrain model (ed. 2015) – WMS

Description

The shares of the DTM (identified as “pixel value” on the map) refer to the terrain both in urbanised and extra-urban areas, while in areas with lakes and invaded the quotas refer to the water level. The main sources used to prepare the DTM are: 1. the Regional Topographical Base for about 80 % of the territory (in particular the information layers related to morphology: level curves, quoted points and break lines); 2. the Lidar surveys of resolution 1 m x 1 m along the auctions of the watercourses and, for limited portions in which the data were not available: 10.000 edition 1982 @-@ 1994. Method of realisation. For the generation of the DTM 5X 5, edition 2015, the following data were used: Vector data of the Topographic Database: from the DbT batches available in July 2015, a series of information layers were extracted, analysed and harmonised, considered suitable for the realisation of a digital model of the terrain through the preventive construction of the “terrain data model”, a vector model of data that provides for the multiscale and multi-resolution approach of the data. The accuracy of the altimetric data for these areas is dependent on the scale of the DBT survey: — in the areas detected at 1:2.000 scale (urbanised areas), the accuracy at altitude is 0.30 m, corresponding to the level 4 of the “Technical Requirements for the production of Digital Land Models” -Intesa GIS Stato Regioni; – in the areas detected at scale 1:5.000 (extra urban intensively infrastructured) the accuracy in altitude is equal to m 1, corresponding to the level 3 of the “Technical Requirements for the production of Digital Land Models” – in the areas detected at scale 1:10.000 (extra urban agricultural and forestry) the accuracy at altitude is equal to 2.2 m. corresponding to level 4 of the “Technical Requirements for the production of Digital Soil Models”. From the DBT database, the geometrical primitives related to the layers were selected: vehicular circulation area, secondary mixed road, transport site on iron, embankments, wet area of watercourse, body of water, artificial reservoir, water element, level curves, listed points, break line, escarpment. Then the objects were selected, analysing each individual DBT batch, in order to verify the elements to be used and discard any anomalies. The data harmonisation activities have been deepened for the layer L050101 “level curves”, making a selection of isoipses with equidistance 10 m and then proceeding with their harmonisation along the lot boundaries. At the end of the phase of harmonisation and correction of the most obvious anomaly cases, the TIN model was developed and then derived the DTM 5 m of DBT origin, for the areas of the regional territory covered by this type of data. To use the WMS service in version 1.3.0 in other display software, copy the address from the field “online resources”

Resources

Name Format Description Link
0 https://www.cartografia.servizirl.it/arcgis/services/wms/DTM5_RL_wms/MapServer/WMSServer?

Tags

  • 5x5
  • modello-digitale-del-terreno
  • digital-terrain-model
  • eu
  • orografia

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