This detail map (click to enlarge) shows the railway line of the Kristianstad-Hessleholms railway company. It is a vignette on a 1906 share of the Kristianstad-Hessleholms Järnvägsaktiebolag. The railway company was founded in 1863 and nationalized in 1944.
I often scan details of certificates, but how do I name these images ? The scanned image of a whole certificate gets the same filename as the ID - identification number - of the certificate in my database. In this case, the certificate has an ID of 1405. So, the image has 1405.jpg as its filename being the name of the certificates ID and the file type "jpg" in this case.
Scanned image files of details on certificates also need a filename. This is how I do it. Just take a look at the example of the Swedish railway certificate.
First, we need to position the vignette from a reference point. I use the center of the certificate, which is at the crossing of the bisector lines. Now, imagine a clock in the center of the certificate.
We position the vignette as a combination of a direction (an hour on the clock) and a distance of the center of the vignette from the center of the clock (0%) to the border (100%).
So, our detail image can be "positioned" at 10 o'clock - 60% . The filename of the resulting scan will be 1405_10_60.jpg, which is the outcome of the certificate ID, the hour position and the distance % and the file extension jpg.
Purists, can question this example and argue that 1405_1030_55.jpg is more accurate. However, it is an approach that has worked well for many years now, and, when ordering the files by filename in your file folder list, detail images get sorted along with the images of the whole certificate.
So, that's how I do it. I'd happy to learn from other approaches. In case you'd wonder, here is the whole certificate's image.