【正确答案】Ramp scaling:A log scaling method that has been popular since the adaptation of trucks to haul logs has been the 'ramp scale'. In this approach the log truck is driven beside a scale ramp which is simply an elevated platform and from there the log scaler climbs around on the truck and on the load and measures and grades the logs.Although the ramp is typically operated by the scaling bureau it may be located with a sawmill yard that is buying the logs or it may be at some other convenient location. Ramp scaling is often used where space is limited, speed is important, or the logs are of relatively low value. Assessing the grade of a log involves inspecting the log for defects and when it is in the middle of a truck load of logs it may be difficult to see the log.
   Rollout scaling: Particularly where high value logs are involved a preferred method of scaling is a 'roll out' method. In this process the logs are removed from the truck and rolled out on the ground or on skids a single layer deep. The scaler can then see a good part of every log to assist in determining what if any defects it may have such as sweep, or rot. Roll out scaling has to be done where heavy machinery is available to handle the logs, and requires the space to do the rollout, and time and expense of the extra handling. If handled correctly, rollout scaling can be more efficient (at least for the trucks) as the trucks do not have to wait to be scaled and can be unloaded and leave immediately. This contrasts with the ramp scale where the truck must wait with the load until the scaling is complete.