Google's In-Depth articles search results help users learn about a broad topic. Google has recently introduced this new feature in its search rankings results. According to research,10% of people's daily search needs are for more in-depth content. These results are ranked algorithmically based on many parameters with high quality & in depth content. Google's webmaster guidelines also provide information on how to create compelling content. Search engines love fresh & updated content. This helps drive traffic to the pages.
Following are some of the ways to notify Google about a in depth article
1) Using schema.org “article” markup
2) Providing Authorship markup,
3) rel=next and rel=prev for paginated articles
4) Provide information about your organization’s logo,
5) creating compelling in-depth content.
Well-researched Quality content & which is original is a must for higher rankings. The content should be non commercial & should not have any selling proposition. The content should be relevant. Images which can crawled should be included as part of the article.