Some users were experiencing intermittent network connection issues over the weekend. The OTISS servers themselves were up and stable, the problem was with internet connections at our hosting centre. We have fixed the issue and upgraded our security and firewall at the same time. Sorry for any inconvenience.

The OTISS servers will be shutdown tonight from 6:00pm for upgrade and maintenance.
Please login again in the morning.


BS 5837 shadow outlines for height
and ultimate height. Also can now
customise the text.
The December 2019 release is mostly about improved layout, presentation and help on the website pages. In addition, there are a few small enhancements: vertical information blocks when printing maps; BS5837 CAD shadow outlines for tree height and ultimate height; KeyTREE now accepts polygons and estimated values
Read about our latest updates and features…

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