Update the download link for DLR-ACD 

Could you please update the link used to download the DLR-ACD as it has been changed recently:
https://www.dlr.de/en/eoc/about-us/remote-sensing-technology-institute/photogrammetry-and-image-analysis/public-datasets/dlr-acd

Please try the link to make sure you have access. 

Could you please also add the 3619×5226 as the average resolution to the table?

Thank you. 
