Grid Arithmetics
In one grid file up to four evaluation parameters plus a ground grid can be saved. Those grids can be referred to using the following expressions:
| R0 | refers to the current grid with all defined evaluation parameters. A grid arithmetics would effect all grids of all evaluation parameters. |
| R01 to R04 | refers to the current grid, just for one the defined evaluation parameters 1 to 4 |
| R0g | refers to the current ground grid |
| R1 | refers to a saved grid loaded to input box R1 and effects the grids of all evaluation parameters |
| R11 to R14 | refers to the grid loaded to input box R1, just for one the defined evaluation parameters 1 to 4 |
| R1g | refers to the ground grid loaded to input box R1 |
| R3 to R6 | analogously as described above |
| R1@V1 | refers the grid of all evaluation parameters in variant 1, loaded to input box R1 |
| R11@V1 bis R14@V1 | refers the grid of one of the evaluation parameters 1 to 4 in variant 1, loaded to input box R1 |
| R61@V16 bis R64@V16 | refers the grid of one of the evaluation parameters 1 to 4 in variant V16, loaded to input box R6 |
Grids can be addressed either by the capital character „R“ or by the lower-case character „r“.
Examples
| Variable | Explanation |
| r0+1 | adds to value 1 to the current grid (for all 4 resulting grids when the respective check-boxes are deactivated) |
| r01+1 | adds the value 1 to the for evaluation parameter 1 of the current grid |
| r1--r0 | subtracts energetically the current grid r0 from the loaded input grid r1 (for up to 4 evaluation parameters 1 to 4) |
| r0++r1 | sums up energetically the current grid r0 and the loaded input grid r1 (for up to 4 evaluation parameters 1 to 4) |
| r01-r1g | subtracts the ground grid of the grid which has been loaded for input grid R1 (r1g) from the current grid of evaluation parameter 1 (r01) |
| r01++r13 | sums up energetically the evaluation parameter 1 of the current grid R0 and the evaluation parameter 3 of the grid loaded into R1 |
| r02--r14 | subtracts energetically the evaluation parameter 2 of the current grid R0 and the evaluation parameter 4 of the grid loaded into R1 |
Grid Variable OK
By the grid variable OK it can be evaluated for each grid point how its value was determined. The grid variable OK may receive the following values:
- 0 = invalid
- 1 = calculated
- 2 = interpolated
- 3 = extrapolated
Example
| Variable | Explanation |
| iif(r0ok==3, invalid, r0) | This expression sets all extrapolated grid points to „invalid“ (e.g. for grid points below buildings). This may result in „gaps“ in a noise map. |