## In a glance

This module scales the default layer with a given factor. Often heat and cold demands are reported in an aggregated manner in energy balances. Using this calculation module, it is possible to us the distribution of default Hotmaps heat and cold demand density maps to dis aggregate such values. This is done by scaling the default Hotmaps heat and cool density maps up or done to reach the desired value.

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## Introduction

This module scales the default layer with a given factor. Often heat and cold demands are reported in an aggregated manner in energy balances. Using this calculation module, it is possible to us the distribution of default Hotmaps heat and cold demand density maps to dis aggregate such values. This is done by scaling the default Hotmaps heat and cool density maps up or done to reach the desired value. The calculation module provides a new raster by scaling a raster density map by a user-chosen factor. It generates a new raster by multiplying each cell of the input raster by the given factor.

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## Inputs and outputs

The input parameters and layers, as well as output layers and parameters, are as follows.

Input layers and parameters are:

• Multiplication factor [-]: a real value between 0 and 1000
• if the multiplication factor is > 1, the output raster is greater than the input.
• if the multiplication factor is < 1, the output raster is smaller than the input.
• The layer to be scaled:
• Heat or Cool density map in raster format (*.tif): It is possible to scale personal heat and cool density maps up or down as well.

Output layers and parameters are:

• An output raster (*.tif), corresponding to the input scaled by the multiplication factor.

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## Method

Each cell's value of the input raster is multiplied by the multiplication factor.

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## Interpretation of results

If we know the total consumption of an area, and the indicator Total head demand does not correspond this value, it is possible to scale the heat demand by the ratio (Total_real / Total_default). The following figure gives the example of a multiplication factor value of 0.5.

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## GitHub repository of this calculation module

Here you get the bleeding-edge development for this calculation module.

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## Sample run

Here, the calculation module is run for the case study of Vienna, Austria. First, use the "Go To Place" bar to navigate to Vienna and select the city. Click on the "Layers" button to open the "Layers" window and then click on the "CALCULATION MODULE" tab. In the list of calculation modules, select "CM - Scale heat and cool density maps".

### Test Run: default input values

After pressing run a new density map is calculated on the basis of the selected map. The default value here is the heat density total map. After the calculation, the total new heat demand is shown on the right side, under indicators. (Here the default value is 1 and therefore, no change in the indicators occurs).

After closing the calculation modules and switching to the layer section, the newly calculated heat density map can be found at the very bottom of the LAYERS tab. This layer can be downloaded by the user and also can be uploaded to the user account for the purpose of further calculations.

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## How to cite

Thiery Bernhard, in Hotmaps-Wiki, CM Scale heat and cool density maps (April 2019)

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## Authors and reviewers

☑ This page was reviewed by Lesly Houndole and Albain Dufils (CREM).

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