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The aerial photograph interpretation and transfer method has the advantage that the photo image is true and intuitive, and the staff can master the interpretation technique with a little training, and can relieve a large number of fieldwork and reduce the labor intensity. However, the internal painting work is cumbersome and the workload is heavy. There is still no convenience and simplicity of the land area measuring instrument. In addition, the aerial map is the same as the topographic map, and its accuracy varies with the scale. If the scale is large, the workload is large and the scale is small. However, the small scale may not reflect the small class and affect the work accuracy.
The method of topographic map drawing is the most commonly used and most widely used method at present. Its accuracy is affected by people's toxicity (recognition and drawing ability), and mainly varies with the topographic map scale, l: 2,000,000. On the topographic maps, the width of a narrow field of less than 25 meters long, and less than 20 acres of dry land, vegetable fields or other small plots, it is difficult to accurately draw out; 1:5000. In the topographic map, it is difficult to reflect the linear features with a width of less than 50 meters and the land with an area of ​​less than 75 acres. The steps of this method are numerous and not directly measured by the land area measuring instrument.
Although the above three methods are conventional methods in past land area measurement, they have a common defect when they are used in county-level agricultural zoning. It is difficult to ascertain the area of ​​strip-shaped objects and small-scale land types. It is precisely in the survey of land resources that it is the most important. Because this problem has not been solved, the area of ​​arable land cannot be checked, and the area of ​​rivers and roads cannot be clarified. After the agricultural, forestry, and water specialities finish investigating field resources, the consolidation of various types of land area creates contradictions. This is also positive. It promotes the development and widespread use of land area measuring instruments.
Two Dimensional Movement Mixer
EYH two-dimensional movement mixer is mainly composed of three parts such as the drum, oscillating frame and machine frame. The drum is installed on the oscillating frame, supported by four rollers and positioned axially by two catch wheels. In the four supporting rollers, the two driving wheels are pulled by the rotation power system to make the drum turn. The oscillating frame is driven by a group of crank rocker mechanism, which is installed on the machine frame. The oscillating frame is supported on the machine frame by the bearing assembly.
Features:
The drum of the EYH two-dimensional movement mixer can carry out two movements simultaneously: one is the rotation of the drum and the other is the oscillation of the drum along with the oscillating frame. While the materials to be mixed carry out rotation, turning and mixing along with the drum, they also make reciprocating mixing movement along with the oscillation of the drum. Under joint action of the two movements, the materials are sufficiently mixed within a short time. The EYH two-dimensional movement mixer is suitable for mixing all powder and granular materials.
Drawing:
Two Dimensional Movement Mixer,Two Dimensional Movement Blender, Two Dimensional Mixing Machine, 2D Movement Mixing Machine, 2D Movement Blending Machine
Jiangyin Jirui Machinery Manufacturing Co,LTD , https://www.jyjiruimachine.com