| CPC E02D 3/026 (2013.01) [E02F 9/262 (2013.01); E02F 3/841 (2013.01)] | 14 Claims |

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8. A method of sensing ground compaction from a work machine, the work machine extending in a fore-aft direction, the method comprising:
generating a chassis angle signal from a first sensor coupled to a chassis of the work machine, the chassis angle signal indicative of a chassis angle relative to a direction of gravity;
generating an attachment angle signal from a second sensor coupled to an attachment of the work machine, the attachment angle signal indicative of an attachment angle relative to the direction of gravity;
generating an attachment spacing signal from a third sensor coupled to the work machine wherein a distance between a grading attachment and the chassis is derived;
generating a location signal from a fourth sensor coupled to the work machine, the location signal indicative of one of the chassis and the attachment;
receiving the chassis angle signal from the first sensor by a controller of the work machine;
receiving the attachment angle signal from the second sensor by the controller;
receiving the attachment spacing signal from the third sensor by the controller;
receiving the location signal from the fourth sensor by the controller;
determining an as-built grade of a surface based on an attachment reference at a first location of the location signal;
determining a compaction value of the as-built surface based in the chassis angle signal, the attachment angle signal, the attachment spacing signal, and the location signal when a chassis reference point reaches the first location as the work machine traverses across the surface wherein the compaction value is an elevational difference of the as-built surface and the as-built surface compacted by the ground-engaging mechanism; and
modifying movement of the work machine based on the compaction value.
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