Types of Aerial Photography. These brief descriptions cover the most common types of conventional aerial photographs. OBLIQUE - The most common type of aerial photograph. It is shot looking down at an angle to the ground (ie not directly overhead as in a 'Vertical' or 'Near Vertical'). Obliques can be either 'High' or 'Low'.
The star schema and the snowflake schema are ways to organize data marts or entire data warehouses using relational databases. Both of them use dimension tables to describe data aggregated in a fact table. Everyone sells something, be it knowledge, a product, or a service.
A schema is normally described using Structured Query Language (SQL) as a series of CREATE statements that may be used to replicate the schema in a new database. An easy way to envision a schema is to think of it as a box that holds tables, stored procedures, views and the rest of the database in its entirety.