In order to create the output voice coverage layer, the input signal strength raster is processed by a series of geoprocessing tools and models. The output from each of these tools and models is intermediate and overwritten during an iterative process where the output from a series of steps becomes the new input. To better understand what each process is performing, the major geoprocessing tools and models are explained, with the output shown for a sample area:
- The input raster (cell values ranging from -100 to 52) is reclassified by three different power levels: -70, -80, and -90 (represented by the colors red, green, and blue, respectively). Each image is then filtered to remove noise.
- Resampling further simplifies the rasters. The three rasters are then mosaicked together with the maximum operator.
- After Raster to Polygon is executed, small features, holes, and gaps remain.
- Once small features have been merged with neighboring polygons, holes and gaps are filled in.