Creating a <receptor>.txt file

Requirements:

• A shape file of the 'sub-areas' of the hotspot
• A shape file of the receptor
• A text file with information on the grid as it is in FEWS. The first two columns contain all coordinates. The third column contains a unique gridID which can be used to access the right coordinates in the hazard.nc. Ordering is important. 

All three files need to be in the same projection. 

Creating the FEWS_grid.txt

See first part of this Matlab code as example. 

Step-by-step tutorial for QGIS: Creating the <receptor>.txt in QGIS 

1. Open a new project in QGIS

2. Add the FEWSGrid.txt as an delimited text layer to a empty project (Layer -> Add Layer -> Add Delimited Text Layer). In the popup window select 'First record has field names', e.g.:

   

3. Add the shape files (Layer -> Add Layer -> Add Vector Layer). After this the screen should look like this: 

   
4. Introduce unique IDs for each sub-area (or "sector") and each receptor
   1. Select a layer and open its attribute table (Right click -> Open attribute table)
   2. 'Toggle editing mode' (pencil icon)
   3. 'Open field calculator'
      
      1. Check the 'Create a new field' box and choose an 'output field name' (receptorID or areaID depending on the layer you selected)
      2. Set 'Expression' to $rownum
         
      3. Click 'Ok'
   4. 'Save edits' and once more 'Toggle editing mode'
   5. Repeat a-d for the other layer

1. Add the shapes file (Layer -> Add Layer -> Add Vector Layer)

Related articles

• Page:
  How to configure secure https connection to Matroos
• Page:
  Tutorial: Creating a <receptor>.txt file