Tag Archives: Professional Map Making

OCAD as Cloudable Application

OCAD 2018 runs as app on clouds like DropBox or OneDrive. Install your Team or Single User Licenses in the Cloud.

Especially the installation of OCAD Team User Licenses in the Cloud, has many advantages.

– You have only one installation and it’s therefore also much easier to update
– It’s becoming easier to transfer a Team license from one member to another one
– When a Team member starts OCAD, he can choose an available license.

OCAD Tipps with Mouse and Keyboard

For the complete workflow, please visit our Wiki.

Declination / Rotate Map

Declination – Background Information

Magnetic meridians. Source: Wikipedia.

Does a compass point to the geographic North Pole? No. Does a compass point directly to the magnetic North Pole? Not necessarily.
The compass is always oriented in the direction of the local magnetic meridians and therefore usually shows neither exactly to the geographic nor straight to the magnetic North Pole. The Declination is defined as the angle between the direction of the magnetic meridians and the direction to the geographic North Pole at the observation site.
If magnetic north lies west of geographical north, the declination is called western and counts as negative; if magnetic north lies east of geographical north, the declination is called eastern and counts as positive.
An observer in middle and northern Europe sees the Arctic magnetic pole to the west of the geographical North Pole. At the same time, however, he notes that the local magnetic meridians are pointing in a direction just east of the geographical pole, so that the declination here is a few degrees east.

World Magnetic Model. Source: NOAA.

Declination varies both from place to place and with the passage of time. The reason for this are complex fluid motions in the outer core of the Earth which cause the magnetic field to change slowly with time. That’s why old maps have to be adjusted to the new declination time by time.
The declination in Switzerland is currently only around 2° and is therefore neglected in almost every map. 1° difference would mean 2.2m deviation for 100m. In the example below, you should miss the control by about 13m on the right (purple x)  when running straight with your compass ( 2.1° declination, 280m distance).

How can you adjust the Declination in OCAD?

In OCAD, there’s a new function called Rotate Map to Magnetic North.
This function considers the Magnetic declination and the Grid convergence of your current position and suggests by how much the map should be rotated. Learn more about this new function here.

In the Map Menu, there are two more functions where you could rotate your map. Do not edit the Angle in the function Set Scale and Coordinate System. Only change the angle there, if you start a new map and haven’t drawn any objects yet. The function Rotate Map is basically the same as Rotate Map to Magnetic North, but not that sophisticated.

Things to consider

Every time you rotate the map, the position accuracy of your objects is reduced a bit due to rounding differences. Therefore, we recommend not to adjust your map every year to the current declination, but maybe every fifth year.

A possible workflow would also be to rotate the map only before you print and export it. This way, you avoid rounding errors. The disadvantage is, that if you rotate the map at once with a big angle, non-rotated objects oriented to north could possible suddenly interact with rotated objects in a negative manner. Therefore, we do not recommend this workflow.

Remove Overshoots and Undershoots

Overshoots and Undershoots happen when your drawn line doesn’t connect exactly with the neighboring line it should intersect with. Mostly, the error only becomes visible with a large zoom level.
In OCAD, there is a function that removes Over- and Undershoots of selected lines. If you want to prevent Over- and Undershoots, enable the Snapping function.

Remove Overshoots and Undershoots

For an animation and more information, please see our Wiki.

 

Vectorize automatically cliff features

A new function has been added to the latest OCAD 2018 Service Update: Vectorize automatically cliff features.

With OCAD, you can now automatically convert cliff features from the Slope Gradient calculation into vector symbols.

Please find more information in our Wiki.

To use this function, you need the latest OCAD 2018 Service Update, which can be downloaded from the Help -> OCAD Service Update function in the OCAD program.