Enhance gdal_viewshed with Additional Parameters for Improved Viewshed Analysis

[leonidb555]

Feature description

Hello GDAL Team,
I am currently utilizing the gdal_viewshed utility for viewshed analysis in my project, and I've identified a few features that would significantly enhance its functionality and versatility for different analysis scenarios.

Proposed Enhancements:

1. Horizontal Start Angle (Optional) :
   Description : Define the start angle of the horizontal scan range (Horizontal Field of View - FOV).
   Range : 0 to 360 degrees, where 0 is oriented to north.
   Type : Integer or floating point.
   Default : 0.
2. Horizontal End Angle (Optional) :
   Description : Define the end angle of the horizontal scan range (Horizontal FOV).
   Range : 0 to 360 degrees, where 0 is oriented to north.
   Type : Integer or floating point.
   Default : 360.
3. Vertical Lower Angle (Optional) :
   Description : Define the lower vertical angle limit of the scan relative to the horizontal plane (Vertical FOV).
   Range : -90 up to but not including 90 degrees.
   Type : Integer or floating point.
   Default : -90 (straight down).
4. Vertical Upper Angle (Optional) :
   Description : Define the upper vertical angle limit of the scan relative to the horizontal plane (Vertical FOV).
   Range : Above -90 up to and including 90 degrees.
   Type : Integer or floating point.
   Default : 90 (straight up).
5. Inner Radius (Optional) :
   Description : Set the start distance from which visibility will be determined. Cells closer than this distance will not be visible in the output but can still block visibility of the cells between inner radius and outer radius.
   Type : Floating point.

Benefits :

These additional parameters will greatly enhance the flexibility of gdal_viewshed, allowing it to more accurately model real-world scenarios where visibility is affected by specific directional limits.
This can be especially useful in applications such as urban planning, defense, telecommunications, and any field requiring precise visibility modeling.

I believe these features will make gdal_viewshed a more powerful tool for users engaged in complex spatial analyses.

Thank you for considering this enhancement request. I'm looking forward to your feedback and am happy to provide further information if needed.

Additional context

No response