![]() ![]() Step 3: Goto the BS3837 spreadsheet page and use the Site and Survey filters to select what trees are required. If the drawing has used the national grid co-ordinates, then you can also use GPS and also use the online maps and aerial images. ![]() Step 2: Use the OTISS mobile survey apps and the CAD drawing to plot the trees and gather the BS5837 survey data. See Loading Maps & Plans for full details. The drawing can then be used like any other uploaded map or site plan – you can pan/zoom around the map and plot trees, groups, RPAs onto the drawing. Step 1: OTISS allows you to directly import CAD drawings. After surveying, OTISS can generate a DXF file containing the tree icons, RPA and shadow arcs (see below), which can be easily merged with the original CAD drawing. While surveying you can plot trees directly onto this base drawing.
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