To set a scale for your scene you can set a known distance between 2 user tie point points and create a scale constraint. 1. From your AT block > Surveys tab (if you use ContextCapture 4.4) then click on Edit user tie points button. 2. Create 2 different points (report each of them on 3 to 4 images if possible) and save 3. Click on Edit positioning constraints button > Add Scale constraint and set a distance unit between your 2 pts (point A and point B) 4. Now you need to run again the AT and choose the " use positioning constraints on user tie points " option (should be selected by default) The scene has now a scale you have defined. Let say you have defined a distance of 1 meter between the 2 points, so you can set 0.01 as point sampling unit value and it should give an AVERAGE density of 1 point at every centimeter. Hope it helps Pierre
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