Path planning based on obstruction mapping

1. A method, comprising:

receiving a three-dimensional map of one or more obstructions associated with a field, the one or more obstructions presenting an obstacle to line of sight reception from a satellite to a global navigation satellite systems (GNSS) receiver;

receiving almanac data corresponding to an orbit of the satellite;

determining anticipated accuracy of GNSS positioning in the field at plural locations and plural times based on the almanac data and the map;

determining waylines for autonomous traversal through the field based on the anticipated accuracy at the plural locations and the plural times; and

determining a plan for traversing the waylines to optimize the accuracy of GNSS positioning, the plan involving traversing waylines in a first region at a first time and traversing waylines in a second region at a second time such that GNSS positioning accuracy is better in the first region at the first time and better in the second region at the second time.

2. The method of claim 1 , wherein determining anticipated accuracy comprises computing a dilution of precision (DOP) for points throughout the field.

3. The method of claim 1 , wherein determining waylines for traversal of the field comprises re-ordering a sequence of paths associated with the waylines previously used for the field.

4. The method of claim 1 , wherein determining waylines for traversal of the field comprises generating new waylines.

5. The method of claim 4 , wherein generating new waylines comprises using plural wayline types.

6. The method of claim 1 , wherein the wayline traversal is planned to improve an overall positioning accuracy.

7. The method of claim 1 , wherein determining the anticipated accuracy of positioning in the field at the plural locations and the plural times comprises determining the anticipated accuracy at defined projected increments of time for traversal of the entire field.

8. The method of claim 1 , further comprising re-determining waylines responsive to an interruption of field traversal that occurs during traversal according to the determined waylines.

9. The method of claim 1 , wherein the one or more obstructions comprise one or a combination of in-field obstructions, obstructions along a border, or terrain obstructions.

10. A system, comprising:

a machine comprising a guidance system and a global navigation satellite system (GNSS) receiver, the GNSS receiver configured to receive almanac data corresponding to an orbit of a satellite;

a computing device configured to:

receive a three-dimensional map of one or more obstructions associated with a field, the one or more obstructions presenting an obstacle to line of sight reception from the satellite to the GNSS receiver;

determine anticipated accuracy of GNSS positioning of the machine in the field at plural locations and plural times based on the almanac data and the map;

determine waylines for autonomous traversal through the field based on the anticipated accuracy at the plural locations and the plural times; and

determine a plan for traversing the waylines to optimize the accuracy of GNSS positioning, the plan involving traversing waylines in a first region at a first time and traversing waylines in a second region at a second time such that GNSS positioning accuracy is better in the first region at the first time and better in the second region at the second time.

11. The system of claim 10 , wherein the computing device is configured to determine anticipated accuracy by computing a dilution of precision (DOP) for points throughout the field.

12. The system of claim 10 , wherein the computing device is configured to determine waylines by re-ordering paths associated with the waylines previously used for traversing the field.

13. The system of claim 10 , wherein the computing device is configured to determine waylines by generating new waylines.

14. The system of claim 13 , wherein the computing device is configured to generate new waylines using plural wayline types.

15. The system of claim 10 , wherein the computing device is configured to determine waylines that improve an overall positioning accuracy.

16. The system of claim 10 , wherein the computing device is configured to determine the anticipated accuracy of positioning in the field at the plural locations and the plural times by determining the anticipated accuracy at defined projected increments of time for traversal of the entire field.

17. The system of claim 10 , wherein the computing device is configured to re-determine the waylines responsive to an interruption of field traversal that occurs during traversal by the machine according to the determined waylines.

18. A machine, comprising:

a guidance system;

a global navigation satellite system (GNSS) receiver, the GNSS receiver configured to receive almanac data corresponding to an orbit of a satellite; and

a computing device, the computing device configured to:

receive a three-dimensional map of one or more obstructions associated with a field, the one or more obstructions presenting an obstacle to line of sight reception from the satellite to the GNSS receiver;

determine anticipated GNSS accuracy of positioning of the machine in the field at plural locations and plural times based on the almanac data and the map;

determine waylines based on the anticipated accuracy at the plural locations and the plural times;

determine a plan for traversing the waylines to optimize the accuracy of GNSS positioning, the plan involving traversing waylines in a first region at a first time and traversing waylines in a second region at a second time such that GNSS positioning accuracy is better in the first region at the first time and better in the second region at the second time; and

provide the waylines for use in the guidance system.