Smoothing lidar data

To Bezier curve first

In my early days of handling lidar data I was getting unacceptable results from smoothing lidar data. A tip from OCAD Inc fixed my issues immediately.

Change the contours to Bezier curve first, then smooth.

Why? Because a better contour curve results from more vertices.

OCAD ISOM 2017 colour table changed 26.6.18

ISOM 2017 digital presss colours

The background

When OCAD first released their ISOM 2017 templates, the colour table was the result of testing on a Xerox Versant digital press.

The 26 June 2018  release of OCAD 2018 saw the colour table, for the ISOM 2017 templates, change to fit with the newly released Appendix 1 of ISOM 2017

Appendix 1 is specified for CMYK offset printing.

Should you be worried?

The new OCAD colours (to ISOM spec) for ISOM 2017 are different from the first release.

Thus you need to be aware that maps from the new ISOM 2017 template might not produce your expected colours in print on a digital press. If you do find an unacceptable difference then you should consider retaining the old template for maps to be produced on a digital press and using the new template only for offset printing.

OCAD 2018 runs on Linux

OCAD on Linux Ubuntu image

OCAD now open to Linux users

OCAD runs on Ubuntu using Wine.

For more read ocad.com/blog/2018/05/run-ocad-on-linux

Easy Georeferencing with OCAD 2018

OCAD New Map Wizard OSM

Georeference with OCAD 2018 New Map Wizard

Use New Map Wizard to haul in a georeferenced OSM (Open Street Map) covering the area of your un-georeferenced map. Save the resulting OCAD map then use it as a background map to georeference your target map.

Tips for best results

  • Best features to use are well defined road junctions.
  • Avoid roundabouts, curves, tracks as they tend to be less precise.
  • Start with just 4 points well spread.
  • Then if some lines don’t match well, select more points for the next round.
  • A wonky old map could take 3 or 4 rounds.
  • Any more and you need to consider rubber sheeting or starting a new map.

More learning

A 1m 30s video of the New Map Wizard https://www.screencast.com/t/vOO49aEr5Fzb

OCAD helo wiki on the same topic https://ocad.com/wiki/ocad/en/index.php?title=New_Map_Wizard

Looking for Indoor Orienteering Symbol Set?

OCAD Inc logo

Indoor orienteering symbols sets

OCAD Indoor O symbol set
OCAD Indoor O symbol set

You can download these at scales of 1:100, 1:200 and 1:400 from www.ocad.com/en/documents

These are OCAD files. You can either

  • rename the file to act as a template (in which case I suggest you make it read-only
  • or import into an existing map file via Map > Load colours & symbols from…