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Road Name Alignment

May 18 2011 | 0 comments
Categories: ArcGIS 10, Labeling, Maplex

I have been producing some UK street maps with OS MasterMap data, using the ITN road centreline polylines to label the roads (Maplex labelling).

When I convert these labels to annotation in order to fine tune some of the label placements, I have noticed that quite a lot have lost the accurate positioning that they originally followed along the ITN polylines. So rather than having a road name sitting centred between the road sides, they become offset towards the sides and usually unevenly.

I realise that you can manually get the text to follow a feature (the ITN centreline), but to do this on a large street map will take an age.

The uploaded file shows two correctly aligned road names (in green boxes) and a mis-aligned road name (in a red box).

Is this a known problem with converting text along polylines into annotations, or is there something that can be done to prevent this mis-alignment?


Mapping Center Answer:

You might see this when you convert labels to annotation if the conversion was performed on a really large extent. Maplex's precision can decrease when converting large extents to annotation if there is not enough RAM to handle such an extent. On screen, it is only placing the current extent.

One solution is to convert the labels to annotation in "batches" a bit at a time, appending the new anno to what is already converted. In ArcGIS 10.0 we have a new geoprocessing tool called Tiled Labels to Annotation to handle this.

If this does not solve your problem, let us know. It is hard to tell any more from the screenshot because this is from Illustrator after conversion and export, etc.

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