1. Introduction
2. VISTA/VMC Survey Data Selection
3. Constructing Differential Hess Diagrams
3.1. CMD Density Diagrams
3.2. Control Field Selection
3.3. CMD Residuals and Significance Maps
4. Identifying Candidate Young Regions
5. Testing the Identification Strategy
5.1. Synthetic Clusters
5.2. Literature Clusters
5.3. Final Choice of Grid Element Radius
6. Results
6.1. Spatial Distribution of the Young Populations
6.2. Quantitative Analysis of the PMS Populations
6.3. Comparison with Dust Emission Maps
7. Summary and Conclusions