The main points to be noted in the measurement are as follows: 1. Since GPS accepts satellite signals, the GPS antenna must be placed facing the sky. Therefore, the GPS acreter must keep the antenna level up during the measurement process (ie, the LCD screen is horizontally upward). Tilt placement will result in certain measurement errors. 2. Observe the high-rise buildings and signal transmission towers before the measurement. Practice has proved that the measurement accuracy of attachments with high buildings and signal towers is significantly worse than that of open spaces. The reason is that the building will refract the GPS signal, causing a deviation in the positioning. The higher the building, the greater the measurement error, and the high-rise buildings may not receive satellite signals or the errors are unacceptably large. High-power towers such as signal towers may interfere with GPS signals. 3. If you encounter a corner during the measurement, please slow down the walking speed to the corner for a few seconds, then continue to measure as well. 4. Because of the inherent error of GPS positioning, the error may be large when measuring a particularly small area. Under the premise that the signal is good, an error of less than 0.3 mu is acceptable. If the ground length measurement is less than 10 meters, the error may be too large. 5. Try not to measure when the satellite signal intensity of the GPS acreometer is flickering, because the program has already undergone preliminary judgment, and the measurement error is small under the premise that the satellite signal strength is not flashing. 6. The measurement error may be made immediately after the satellite signal is searched for, and the measurement result is stable after a few minutes after the normal startup signal is normal. Main items: 1. The weather has a certain impact on GPS. Cloudy and general cloudy days have little effect on GPS measurements, but measurements under dark clouds and lightning weather can cause large errors. 2. It is strictly forbidden to enter the water or get wet by the rain. 3. Please remove the battery when you are not using the GPS acreometer for a long time. This will prevent the battery from discharging and corrosion the circuit board and prolong the battery life. Satellite search stars and measurement tips: 1. Can the instrument not receive satellite signals in a short time? A. Please confirm that the acre meter is turned on outdoors (all GPS devices must be outdoors to find the signal). If it is determined that the signal is not found outdoors, please remove the battery for about 10 seconds and then re-install the battery to start the search. B. The search location should be in an open space, surrounded by no tall buildings, and wait in place to avoid strong interference in tall buildings or signals, such as signal towers and substations. 2. When the instrument is measuring, why can it measure the data while staying in place? When the instrument starts to measure, the internal calculation area engine has already started. When standing in place, the instrument also receives satellite signals continuously. According to the satellite drift phenomenon, small changes between the information will cause the change of the perimeter value. Therefore, it is recommended to measure once in the measurement process. (So ​​the same principle of GPS acre measurement instrument) A. When measuring the regular line, the appropriate deceleration during cornering will not affect the measurement result; the straight line can pass quickly; the speed is slowed down when turning. B. When measuring irregular terrain, it is not recommended to make quick measurements. Summary of use notes: Boot search star should be outside, the first search star will be slower, the second search star speed will be faster, then the star will be measured after the search, please keep the screen level up when measuring, if you encounter the inflection point to stop One second, the measurement result will be more accurate. When the end point is reached, press the stop button and the measurement result will be automatically displayed and saved. Organic Reishi mushroom extract powder is extracted from Ganoderma lucidum fungus fruit bodies through water or alcohol. It is easily oxidized and deteriorated, so the storage conditions are very strict. The main components of reishi mushroom extract are made of Ganoderma triterpene and Ganoderma polysaccharide.
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3. Does the speed affect the measurement results?
GPS area measuring instrument measurement skills
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