https://www.dhp11.com/docs/ Recent content in Docs on dhp11 Hugo en-uk Mon, 02 Feb 2026 14:30:00 +0000 https://www.dhp11.com/docs/p004/ Mon, 02 Feb 2026 14:30:00 +0000 https://www.dhp11.com/docs/p004/ <h1 id="cleargraph">Cleargraph<a class="anchor" href="#cleargraph">#</a></h1> <p>Created in collaboration with Western Power Distribution (now part of National Grid) and Network Rail, Cleargraph is a Python application written to help maximise the safety of power towers and poles, by calculating the clearance required for overhead lines.</p> <p>Previously a Microstation-based application used by WPD and Network Rail, and dating back as far as 2001, Cleargraph creates a 2D contour showing the maximum safe height of a structure near overhead power cables, based on their range of motion as they sway in potentially very high winds.</p> https://www.dhp11.com/docs/p002/ Mon, 02 Feb 2026 13:35:00 +0000 https://www.dhp11.com/docs/p002/ <p>SnakeGrid Transformer is a MicroStation add-on that converts data between several different coordinate systems, including any required SnakeGrid as well as others such as the London Survey Grid, Ordnance Survey National Grid, and some local engineering site grids.</p> <p><img src="P000002-002.png" alt="SnakeGrid transform between OSGB36 and LSG" /></p> <h2 id="data-transformation">Data Transformation<a class="anchor" href="#data-transformation">#</a></h2> <p>Files are converted from one grid to another in a few seconds with a single button press. No information is lost when files are converted. All symbology and user attributes (e.g. database linkages) are retained. The MicroStation elements in vector maps are converted according to a set of rules:</p>