Since the handheld GPS area measuring instrument is used to determine the coordinate position of the ground measuring point by receiving satellite signals, when there are forest lands, shrub lands, and woodland areas for area measurement, the influence on satellite information reception is great, and canopy density is affected by the forest. The impact is greater, and the impact accuracy increases with the degree of canopy closure; the magnitude of change also increases with the increase of forest canopy closure, and decreases with the decrease in forest canopy closure. More stable. However, there is no obvious impact on grassland and non-forest lands. If necessary, they can be treated as the same conditions. When logging and forest logging incidents and fire incidents occur, and the forest canopy density is relatively small, the GPS area measuring instrument can be used for measurement.
When handheld GPS area measuring instrument is used to measure the forest land area, the rule shape is better with the route method, and the irregular shape is better with the track method. When using the track method to measure, the walking speed should be kept at a constant speed and should not be faster or faster or slower. For irregularly shaped forest lands, if the route method is used to measure, the more points selected on the measured forest land boundary, the more accurate the measurement results, and the longer the time for receiving the signal at each point is, the more accurate (acquire the average coordinates) is. Should be 4 ~ 5min to ensure a stable observation.
Although there are manuals or instructions for use of GPS area measuring instruments, the use of area measuring instruments can be basically grasped. However, its application involves a wide range of applications and is not targeted for application in forest work. Therefore, many forests cannot use the area correctly. The measuring instrument, an advanced technology and collection tool, affects the use effect and processing quality, and in particular affects the accuracy of area measurement. Therefore, according to the needs and technical capabilities of the forest grass-roots units, it is necessary to carry out targeted technical training so that they can really grasp the application technology of the GPS area measuring instrument.
Because GPS of different types and different precisions is currently more important in the market, measurement results of different types of GPS area measuring instruments are different. It is necessary to purchase high-precision, satellite signal receiving capability and relatively accurate measuring instruments to ensure test results. The reliability and accuracy in order to provide accurate basis for forest activities. Because the use of GPS area measuring instruments in the field of independent positioning accuracy is not high, so you can not use a separate machine, small forest land, land area measurements should adopt GPS differential positioning technology, measurement of small land area, forest land area measurement to achieve higher Accuracy requirements.
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