I am looking at a large area approximately 80x80 miles with an extensive road network (see attached, roads are clipped by a study area buffer). So I cannot use the observer option because of the 32 point limit on observers.
I am currently running the Visibility tool with the DEM as the input raster, and roads as the input polyline. Analysis type: FREQUENCY, observer parameters-- Surface offset: 2, Outer radius: 1600.
I thought the Surface offset would account for the 2m vehicle height.
However, the tool has been running for 4+ hours, and I do not think it is working. With an outer radius of 1600, it seems like the calculation would just look at the center of each 30m pixel and calculate visibility from roads up to 1600m. However, I believe it is counting a density, which is taking too much resources.
Is there any way to calculate I's/0/s so that after confirming a pixel is visible from a road, the calculation could move on?