A well-prepared ArcMap export gives us the essential information needed to produce a clear, accurate and visually effective finished map.
The aim is to preserve editable vector information wherever possible. This allows linework, colours, labels and symbols to be refined in Adobe Illustrator without losing quality.
Preparing the background layer
The background layer may be:
- a raster image, such as an aerial photograph or topographic map
- a vector graphic made from polygons
All other layers should remain as vectors.
If the bottom layer is a raster image, prepare it at the actual size required for the brochure or sign map and export it at 300 dpi.
Avoiding rasterised vector layers
If a raster layer sits within a group, ArcMap may rasterise all the layers below it when exporting the PDF. This affects layers that were originally vectors and makes them raster graphics and uneditable in Adobe Illustrator.
A single raster layer is acceptable if it sits at the bottom of the map.
Transparency can cause the same problem. Vector layers with transparency applied, such as NPWS estate and reserve layers, may become raster images in the exported PDF. Layers beneath them will also be rasterised.
Before exporting:
- turn off transparency on all layers
- turn off raster layers unless they form the bottom background layer
- check that all other information remains as editable vectors
Keeping these layers as vectors gives us greater control over the finished map and produces sharper linework at different sizes.
Exporting the PDF
When exporting the map from ArcMap as a PDF:
- Open the export settings.
- Select the Advanced
- Make sure Export PDF layers is selected.
- If the background is a raster image, export the map at 300 dpi.
Exporting PDF layers allows the map information to remain organised and editable during the design process.
Preparing tracks and dashed lines
Export tracks and any other dashed linework as solid lines.
We will convert these lines back to the required dash pattern in Adobe Illustrator. This creates more consistent linework and avoids problems caused by dashed lines changing during export.
Indicating the viewing direction
For signage maps, please indicate the direction from which visitors will view the map. Use 45-degree increments, such as: north, north-east, east, south-east, south, south-west, west, north-west.
This allows us to create a heads-up map that reflects the visitor’s physical orientation. Rather than requiring visitors to mentally rotate the map, the landscape shown ahead of them appears toward the top of the sign.
Creating the finished map
From these files, we can create a finished map similar to the displayed examples or adapt its appearance to suit your project specifications, visual identity and intended use.
