Why does the online service 'Snow, Wind, and Seismic Zone Maps' display a different load value than the corresponding standard in some cases?


The online service 'Snow, Wind, and Seismic Zone Maps' can only save a constant value over a surface area.

Figure 01 - Zone Classification

If the respective load standard specifies an isolines representation of the load over the land instead of a conventional zone classification, the interactive load map shows the areas between the isolines as zones with a constant value. In each case, these zones are assigned the larger value of the two enclosing isolines.

Accordingly, this 'stepped' load representation leads to a conservative load determination for locations between the isolines.


Load maps Isoline Load difference Online service


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