Add some sort of explanatory text for users to the page
There should be something like a short „about“ or „help“ section or similar to explain the purpose and roughly the usage of the page, with links to other SPP stuff. Limitations (such as that only some sources of SPP data are included in the Explorer) should be made clear as well as where to find the primary sources of the data (links to iDAI systems etc.?). This issue might depend on where the site is hosted and how users access it (through links from where).