easymap uses numbers to uniquely identify areas, because names often prove to be disadvantageous for identification purposes, as differences in spelling or abbreviations, for example, are not infrequent. Commonly used numbering systems in base maps are, for example, the postal codes and the official municipality and district codes. easymap also identifies territories by means of numbers. These may consist of numbers and letters.
Territory numbers: hierarchically structured or freely assigned
In the case of territorial organizations with more than one hierarchical level, the numbering system for the territories can also be structured hierarchically. To do this, you specify that the leading n digits of an area number represent the number of the higher-level area level. This corresponds to the numbering system in many large hotels: the first digit of the room number indicates the floor, the following two digits the consecutive number of the room on the floor.
Example 2: The 5-digit postal code in Germany contains the number of the postal zone (= the first digit of the postal code) and the number of the postal region (= the first two digits of the postal code). Postal code area 53175 is therefore located in postal code region 53 and this is in zone 5.
Example 3: The official 8-digit municipality code number is structured hierarchically as follows:
Point 1-2: State
Paragraphs 1-3: Administrative district
Numerals 1-5: Circle
Numbers 1-8: Community
Gemeinde Much (Gemeidekennziffer 05382036) belongs to the Rhein-Sieg district (Kreiskennziffer 05382); this belongs to the administrative district of Cologne (Reg.-Bez. 053) in the federal state of North Rhine-Westphalia (Land 05).
If your territory organization is structured hierarchically, a strictly hierarchical numbering system offers some advantages, e.g. that you can always see from the territory number alone to which superior unit a territory belongs. Nevertheless, you can assign the numbers of the areas for each level freely, i.e. independently of the numbers of the areas in other levels. These offer considerably more freedom in the area construction, e.g:
- Multiple assignments (that is, a postal code can, for example, be assigned to different sales representatives at the same time)
- so-called branching (i.e. one can, for example, simultaneously represent the "old" and the "new" regions above the same sales force districts)
- There are no restrictions when inserting or deleting intermediate levels
- Locks often have a more far-reaching effect on hierarchical area numbers