Lecture Notes on Data Engineering and Communications Technologies is indexed in Scopus but is not available in Scimago. Can anyone help me to understand this?
This is indeed somewhat mysterious. The good news is that ‘normally’ the different Lecture Notes are indexed in SCImago:
Lecture Notes in Networks and Systems https://www.scimagojr.com/journalsearch.php?q=21100901469&tip=sid&clean=0
Lecture Notes in Electrical Engineering https://www.scimagojr.com/journalsearch.php?q=19700186822&tip=sid
EAI/Springer Innovations in Communication and Computing https://www.scimagojr.com/journalsearch.php?q=21101019713&tip=sid&clean=0
Somehow Lecture Notes on Data Engineering and Communications Technologies ISSN: 2367-4512 https://www.springer.com/series/15362 is not included in SCImago. In https://www.scopus.com/sourceid/21100975545 you can see no JSR and SNIP info. Since they are relatively young (and SCImago calculates data over multiple years) I expect that within a year or two they will be included in SCImago.