MAPPING LAYERS

To perform the calculation of a study, Xirio Online requires detailed information of the terrain on which the calculation is running. At minimum, it's necessary the altimetric heights information of the terrain, although in some calculations it's also advisable to have information about the use of the land on which the calculation is perforemed.

There are four types of mapping layers in Xirio Online:

- MDT or altimetry layer: The digital terrain model assigns an altimeter height above sea level to each pixel. This type of cartography is suitable for broadcasting network planning in which urban environments are usually modeled by adding additional clutter losses or by different thresholds depending on the type of environment.


- MDE or elevation layer : Provides information of the Digital Elevation Model (each pixel has a height associated). It's like the MDT but refers to heights of buildings + altimetric elevation. they are only available in cities and are layers of high-resolution

- Digital Surface Model DSM. It includes a digital terrain model plus the height of different elements such as buildings, trees, infrastructures, etc. This type of cartography has a wider extension than the DBM since it includes urban and rural environments. This makes it suitable for access and transport networks design .

- Morphographic layer : This is a raster layer in which each pixel belongs to a category of land use. This category has a number of attributes that can modify the radio signal present at a point either by the increase in height (eg presence of a forest), additional losses (of deterministic nature and that come from a measurement campaign checked with the prediction results), terrain type (according to Recommendation ITU-R 1546) and terrain type according to a wider categorization, and characterized by permittivity and conductivity values.

 

Through the cartography window the user can search the available cartography in Xirio Online and easily add it to his study.

There is the possibility of filtering layers in the system by the following criteria:

- Layer Type: MDT, MDE or Morphography.

- Layer Name: the layers that contain the specified name will be selected.

- Calculation Area: the layers whose surface intersects in whole or in part with the rectangle that will limit the calculation area of study will be selected.

- Regions: To filter by region, first, the user must select a continent and a country. Layers corresponding to that region will be selected.

From this window, the user can access more complete information for each layer by selecting the corresponding option .

This dialog shows all available information of the layer:

- Name.

- Type. MDT, MDE or Morphography.

- Provider.

- Increase in price of calculation. Percentage that indicates the cost of this layer in the calculations. It is only applied in the case of making payment calculations. The following link details how to obtain the cost-per-use cartography.

- Resolution. Is the resolution of the layer. Indicates the size of the pixels of the selected raster layer. For example, in a layer of 100 m resolution, the information about the land elevation will be each 100 m.

- Maximum free resolution. Sets the maximum resolution that a free calculation with this layer can be performed. The following link describes the advantages and limitations of free estimates.

- Description.

For morphohraphic layers, the information icon is accompanied by another icon that allows the access to its associated morphographic dictionary. This opens an edit page for the dictionary:

The morphographic layer attributes are entered through the dictionary and they do not all have to be present. Each ground category can be associated with a Name, Terrain (sea, forest, urban, open ...) that despending on the type the rec. 1546 applies a specific formula, Vegetation (high/medium/low density or not vegetation) which will also affect the calculation, Clutter Losses (the value entered will have units of dB), Height correction (a heigh is entered in meters obove the digital terrain model) and finally have an associated Color. The algorithm takes into account all these attributes, adding precision in the calculation.

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