Calibration attempts to achieve the best possible coverage of the plane to be measured in the image.

Reference area

Once you confirmed the editing process of the image, the app automatically switches to the sizing and calibration mode. A grid pattern will appear over the image. By moving the corner points, you can position the grid. The goal is that the reference area within the image and the grid align as good as possible. The edges of the building are a good starting point for positioning the grid.


Calibration grid

For an accurate setup, zoom in after the first initial positioning. The arrows help to be more accurate. The lines and measurement points within the zoomed-in area fade out with clicking onto the picture.

If you press confirm, you can transfer the reference area.


Zoom window

Reference lines

The next step is to define the reference lines. The app has two modes for this.

Line-Mode

Within the line-mode, you can create a line with a red starting point and an arrow at the end with one click. By moving the starting point, you can move the whole line in the image. By moving the end point, you can move the orientation of the line such as the length. The directions are only valid when they show towards a vanishing point. The directions will point parallel towards the reference area if no vanishing points exist.


Line mode

Point-mode

In the point-mode, you can create a starting point by clicking onto the image and move that point afterward. Once the point is positioned as you like, press confirm to save it. Next, you can draw and move the finishing point. The same restrictions regarding the directions apply as within the line-mode. Within this mode, you can't move the starting point once you press confirm.


Point mode

Length input

Once you confirm a line, a window pops up that asks you to enter a length. Please note that you need to enter the measurements in meters. Only numbers are valid as input.

Following a selection appears to define the second reference for measurement. You can either choose between an approximate approach where the second reference line is calculated or drawing the second reference line. When you draw the lines, the results are more accurate.

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