Looking for information on German late-war improvised airstrips

[Archaeologist]

Hello!

I'm looking for information on German late-war improvised airstrips. How long were these strips, and how did they operate? I have indications that there was a very small airstrip in the area I am currently researching. On aerial photographs you can see some sort of runway being under construction, consisting of the strip itself, a circular cleared area around it (it's in the forest) and a sort of white arrow lying on the ground. The strip itself is very short though, about 400x22 meters. After the war people found 2cm and 13mm ammunition on the site, as well as German smoke canisters (Landungsrauchzeichen) and flare casings. Does anyone have good sources on this topic? I can't seem to find any online. As it could also be a target for strafing exercises I am also looking for information on this topic.

Thanks in advance!

Archaeologist