In this photo you can clearly see the artist is checking the angle of the sloped street, and the height of the windows.
My version of site measuring
I feel scale within site measuring is important to ensure things are in proportion and perspective is correct at an early stage.
Sketching from ‘outside in’.
I have drawn the outside silhouette shape first, spot check my accuracy, and then proceed to subdivide into smaller details.
- is to decide roughly how large I want the drawing on the page.
- Mark the top and the bottom of the subject and lightly sketch the outside silhouette shape.
Site measuring works by extending your arm straight (elbow locked),
(Line A) Keep the thumb in position on the pencil to preserve the measurement you have marked.
I will now keep that measurement and look for something I can compare my measurement against.
(Line B) In this case the height of the jar is equal to the width across the three cups.
(Line A = Line B)
Angle Check-Measuring the slope between two points.
When drawing outdoors, this is ideal for finding roof lines or checking perspective on narrowing city streets. I have used this method before ,I tend to look for where the lines come off the paper also as a guide.