Multiple "maps" from one source document.

[timwaters]

one map image with more than one map on it.

upload and clip out additional maps within it.

for example, see this one.

http://www.sfgenealogy.com/sf/sanborn/sm057.pdf

[timwaters]

I believe the creation of inset maps are a feature of the NYPL Warper

[happy5214]

Bumping this. Creating a new map with the same file (or at least the same filename) as an existing map is not allowed by the software, and in any case re-uploading an image already on the server wastes valuable server disk space.