@Wyvern's answer is great, but you can shorten it a bit to make it a bit easier (There is no need to do the combine step). Here's his text with just a few small edits from me

I am going to need a cemetery battle map soon, so why not dive into it in a live stream. Nothing like working on a map for actual use.

Stream will go live on Thursday at 18:00 CET as usual. Check the upcoming section in the left forum toolbar for the time in your timezone, or click the video below to have YouTube tell you.

Few more maps today, this time it is my entry.

Some new maps from Wyvern in the atlas here. Didn't have time to process all of them, but there is the selection so far.

Ralf had a blog series about this:

He also has a live mapping session with the topic:

If you own the Tome, there is also a tutorial on this starting on page 154

Notice that this behavior can indeed be automatic with the drawing tool, and it is that behaviour the instructions was written against, but it seems that most drawing tools doesn't use it. But if you edit a drawing tool, you'll see it has a setting labeled attach mode, which can be current settings, on or off. Current setting refers to the global attach option, the button down in the lower right of the main gui. On or off is just forcing it to be always on or off. Right click the attach button in the lower right to select exactly which attach option to use, I think endpoint is the default. (The drawing tool can unfortunately not specify which attach option to use, only if it should be used or not)

The displacement is based on a normal map. A normal map is basically a grid of vectors encoded using RGB values so you can store it as an image. The vector encoded in each pixel basically determines the direction for the displacement effect at that point.

The texture size tells CC3+ how to scale the texture you pick. If you want a single displacement image to cover the entirety of your map, set the effects units to map units, and the texture size to a value equal to the width (or height) of your map. If the value is lower than your map size, the displacement image will tile (which is usually the way you would use it).

The displacement amount is basically the strength of the effect, i.e how much the pixels should be displaced. May need som experimenting to get this right, and don't be afraid of going to pretty large values.

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It is certainly not normal behavior for CC3+ to intermittently show red X'es for images that worked earlier, but there are a few external factors I can think of:

• If you have the CC3+ data directory on an external drive like Thescabi mentions, it may be an issue with the drive or connection to the drive. Could also happen with an internal drive if the drive itself was bad.
• Your antivirus is a bit too greedy. Antivirus software often scan files that are opened, and while it does that, it denies other software access. If it keeps the file locked for too long, CC3+'s request may time out, which means it fails to load the file. If this is the case, just hitting :CC2RESMODE: and clear the bitmap cache, check "redraw on ok" and then hit OK should force CC3+ to reload all bitmaps.
• Either the actual bitmap on disk the drawing refers to have been moved, OR if the image is set up with a map-relative path, and you moved the map file but not the corresponding files (The latter is really only a possibility witch custom artwork though, not with the standard symbols and fills from CC3+ and add-ons). You already mentioned you didn't move things, just kept this point here to have a complete list.

This thread about Historical Maps is one of the curated threads in the Resources category. Here you can find links to various sources for historical maps, mostly online, but also book recommendations and the like. This thread is about actual historical maps from Earth not fantasy maps inspired by the style of historic maps. It also covers modern maps of historical locations.

The link goes to the forum post that brought the content to the forum. A direct link to the content is provided in parenthesis for easy access, but please go to the forum post to discuss the content.

Only this top post is curated, users can use the comments below to add links themselves, but I suggest that you do this by starting your own discussion in the Cartographic Resources category, and link to that discussion from your comment here. That way each source have it's own thread where it can be discussed. I'll add the best links to the curated content, but the comments here will be a way to discover even more resources than I showcase.

As time goes by, some links may get outdated as sites die and gets replaced by other sites. If you find any such links here, please use the Flag link to notify me about this but please don't use Flag to ask me to add links.

Historical Maps

• Ancient Earth - 750 million years of earth history (dinosaurpictures.org)
• City Map Collection (reddit.com)
• David Rumsey Map Collection (davidrumsey.com)
• Europe in the 18th & 19th century (mapire.eu)
• George III's collection of military maps (militarymaps.rct.uk)
• Historical European Maps (euratlas.net discusmedia.com)
• Hobbs Architectural Designs (archive.org)
• The Huntington - Maps and Atlases (huntington.org)
• National Library of Scotland (nls.uk)
• New York Public Library 1544-2001 (nypl.org)
• Norwegian Historical maps (kartverket.no)
• Old Maps Online (oldmapsonline.org)
• Perry-Castañeda Library Map Collection (lib.utexas.edu)
• Sanborn Maps (loc.gov)
• Reconstruction of German Castles (burgrekonstruktion.de)
• Survey of London (british-history.ac.uk)
• McMaster University Digital Map Collections (mcmaster.ca)
• Theban Mapping Project - Valley of the Kings (thebanmappingproject.com)
• Fra Mauro's 15th Century world map (mostre.museogalileo.it)