Category Archives: OCAD 12

Save Not-smoothed Contours as separate Background Map

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In this blog we show you how to save not-smoothed contours in a separate .ocd file and load it as background map to improve performance and interaction.

Introduction

OCAD offers great possibilites for generating useful outputs from LiDAR data, as we recently noted in a blog post. A key feature is the generation of smoothed and not-smoothed contour lines.

Unlike relief shading or vegetation maps, OCAD does not generate raster background maps for contours; instead, it generates vector objects that you can edit and that are saved directly in the map file.

When generating not-smoothed contours, the file size can quickly increase. This may lead to display delays if you want to show or hide the contours. Additionally, exchanging data with the OCAD App will become more cumbersome.

Therefore, it can be a good idea to save not-smoothed contours in a separate .ocd file and load it as background map.

Step-by-step instructions

  • Select the not-smoothed contour symbols in the symbol box (use the CTRL-key to select multiple symbols at once) and export them to a new .ocd file with the Map > Export Objects by Selected Symbols function.
  • After exporting, right-click the selected symbols in the symbol box and Delete them. You will be asked to delete the assigned objects as well, what you need to confirm.
  • Now only the smoothed contours are left in our map file, which you can Reshape were needed.
  • Go to menu Background Map > Open to open the exported not-smoothed contours as a background map.
  • Run the Optimize/Repair command in the Map menu to reduce the file size.

Advantages

  • Not-smoothed contours can be shown or hidden more quickly in OCAD Desktop and in the OCAD App.
  • The transparency of not-smoothed contours can be easily adjusted.
  • Not-smoothed contours are always in the background and do not obscure other map objects.
  • File size is significantly reduced.
    PS: You find more tips to reduce the file size in this blog post.
OCAD App with not-smoothed contours loaded as background map.

Control Description – All You Need To Know

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A control description is as essential to orienteering as a compass. You could manage without it, but it makes things easier.

What do you need to know about control descriptions, and what tools does OCAD offer for viewing, printing, and exporting them?

We’ve compiled all the relevant information for you.

-> Read article on our website

How OCAD Helps you With Positioning and Mapping in the Field

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In this blog post, we’ll show you the tools OCAD offers for adding great base data to your mapping project—tools that help you determine your location in the field and allow you to identify and map terrain features, vegetation, and man-made objects.

As you’ll see at the end of this article, all of this base data can be used in the OCAD App to map efficiently and accurately.

LiDAR

If you have access to up-to-date LiDAR data, consider yourself lucky. With LiDAR data, you can create excellent base maps that not only allow you to pinpoint your location but also help you identify many map features.

OCAD calculates two types of Contour Lines: smoothed (green) and not-smoothed (blue). Use the not smoothed contour lines as a background during field mapping, which includes all the details. To draw contour lines on the PC, you can start with the smoothed contours and adjust them as needed using the Reshape function.

Smoothed (green) and not-smoothed (blue) contour lines.

The Hill Shading Map reveals numerous terrain features that are not visible in the contour lines, such as roads, forestry tracks, gullies, small pits and knolls.

Hill shading map of same map extent as above.

The Feature Map is similar to the Hill Shading Map, but also shows features that are close to the ground such as stones, walls, tree trunks, fences, or cars which were previously not or only poorly recognizable on background maps.

Feature map of same map extent as above.

The Las Intensity Map helps you to distinguish between deciduous and coniferous trees.

Intensity map of same map extent as above.

The Vegetation Height Map shows vegetation features ranging from open areas (yellow) and ground vegetation (red) to dense vegetation (green), open forest (white) and high trees (blue). The latter can be particularly useful in open forest with few ground vegetation.

Vegetation height map of same map extent as above.

The Vegetation Base Map is similar to the Vegetation Height Map but focus more on the runabilty of the terrain.

Vegetation base map of same map extent as above.

GPS

GPS is another key tool for determining position, especially when there is no or insufficient Lidar data available.

If your mobile device does not have a built-in GPS module, or if the built-in module is not accurate enough, you can connect it to an external GPS receiver.

In the OCAD App, you can use GPS not only to determine your location, but also to directly capture sketches and objects

We recently published a comprehensive article titled GPS in Orienteering Map Map Making that provides information about GPS and its use with OCAD.

GPS track and GPS position in urban area.

Cadastral maps

Detailed cadastral maps are particularly useful for sprint maps, and they often allow you to pinpoint your exact location and map many features such as buildings, roads or boundaries.

You can import cadastral maps into OCAD in various formats (Shape, GeoPackage, DXF) or load them as a WMS/WMTS background map.

Cadastral map of same map extent as above.

Areal images / Orthophotos

In open terrain, aerial photos and orthophotos can help with positioning and recognizing objects that are not visible on cadastral maps.

You have the following options for loading a georeferenced aerial photo into OCAD.

Aerial image of same map extent as above.

Using the Background Maps and Tools in the OCAD App

Head out into the field with the best possible base map!

All of this base data can be used in the OCAD App to map efficiently and accurately. In the app, you can show or hide various base maps or symbols and show your current GPS position.

  • You can easily show, hide or change the opacity of base maps in the Layers Panel.
  • You can turn GPS on or off in the Positioning settings.
  • You can also easily show or hide symbols (e.g. hide unsmoothed contour lines)

GPS in Orienteering Map Making

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GPS helps you to determine your position in the terrain when mapping, especially when the base data isn’t very accurate. But how exactly does GPS work, and what should you bear in mind when using it?

On the website GPS in Orienteering Map Map Making, you’ll find a summary of useful information about GPS and instructions on how to use GPS with OCAD.

You’ll also learn what equipment will help you achieve satisfactory results as a map maker.