This page explains how metadata is used in the AQUASTAT core database. The metadata structure itself is based on the EURO-SDMX structure, which can be consulted for concept definitions. There are three levels of metadata: data-point level, variable level, and database level.
At a data-point level, there might be comments that either add a caveat or further explain the data-point. The metadata presented was harvested from about 15 years of institutional memory, not all of which was external. Several thousand external metadata have been attached to data, along with over 50 000 quality-control internal metadata. Regarding the categorization of the metadata, we have selected nine categories, explained as such:
The next level of aggregation is at the variable level. This metadata can be accessed by clicking on the icon to the right of each variable in the database query page. View the core database now!
The highest level of aggregation is the database level. Below you can find general information about the AQUASTAT modus operandi, properly categorized.
AQUASTAT main country database
Each variable's unit is noted in the variable metadata accessible from the icon to the right of each variable in the database query page.
For water resources, the reference period is 1961-1990, unless otherwise noted.
This database supports Article 1 of FAO's constitution that requires FAO to "collect, analyze, interpret, and disseminate information related to nutrition, food, and agriculture".
Continuously, as available.
- 1 111.11 gets rounded to 1111
- 111.111 gets rounded to 111.1
- 11.1111 gets rounded to 11.11
- 1.11111 gets rounded to 1.111
- 0.111111 gets rounded to 0.1111
- 0.0111111 gets rounded to 0.0111
- 0.00111111 gets rounded to 0.0011
- 0.000111111 gets rounded to 0.0001
- smaller values are rounded to the first non-zero value. For example: 0.0000111111 gets rounded to 0.00001