Set Distances

Horizontal Distance

Type in the required distance between grid points in the horizontal direction, i.e. along the X axis (East-West). The unit of the distance is the same as the map unit of the projected coordinate system of your study area. Click the Enter button. A green tick mark will appear and the Vertical Distance input field will be activated.

Vertical Distance

Type in the required distance between grid points in the vertical direction, i.e. along the Y axis (North-South). The unit of the distance is the same as the map unit of the projected coordinate system of your study area. Click the Enter button. A green tick mark will appear and the Next > button will be activated. This completes the Receptors from Regular Points step.

If the LUR models contain predictors that are derived from the Inverse distance, Inverse distance squared, Value * Inverse Distance, or Value * Inverse distance squared to the nearest feature, then any receptor points located on top of the nearest feature will result in a division by zero error, because the distance is zero. To prevent this, the wizard will check if the LUR model contains an Inverse distance, Inverse distance squared, Value * Inverse Distance, or Value * Inverse distance squared predictor. If this is the case, the wizard will remove any receptor points located on top of the relevant features. The warning message "Invalid receptor points. See log for details." will appear and the Apply_LOG will record which predictor variable resulted in the removal of receptor points. The Apply_LOG will also record the initial and final number of receptor points used.