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The base map Conformal Conic map projection to projection (double standard parallel conic projection), while those with boundary data topographic map 1:25 million map projection is Gauss Kruger projection,[link widoczny dla zalogowanych], it must be projected between the two transformation. Practical work using the latitude and longitude projection transformation and poor in 1. For control of the grid intersection points, state information base maps (1:25 million topographic map) and geographical base maps (1:70 million map of Guangdong Province) phase approximation method. Geographic base map of the latitude and longitude lines after copying files into Ⅱ F, in Pho-toshop software information will be marked with the realm of topographic map at 1:25 million by the poor in 1. And latitude difference 1. Geographic base map grid to set the corresponding latitude and longitude grid TIF file in order for the control of the intersection of longitude and latitude points of longitude and latitude to make topographic maps and geographic latitude and longitude grid base map 1fIF file match. We will go through treatment, the base map and the basic geographic base maps (1:70 million Taking into account into the picture shows the small-scale charts, when based on small scale maps in order to maintain the position of map elements between the (relationship) of the correctness of the main principles of accuracy in the second,[link widoczny dla zalogowanych], to achieve this accuracy has to meet the practical work needs. 3.2 topographic base map projection transformation splicing after 1:25 million as a topographic map of the coverage is just as error by 1.30, weft and poor in 1. , And 1:70 million geographic base map drawn on the latitude and longitude grid lines for the error by 1. ,[link widoczny dla zalogowanych], Wei 1 poor. , Given the easy access between the edge of map sheet, the actual work will be adjacent in the four sets of Photoshop software, together makes up a good topographic map by the poor in 3. , Wei and poor in 2. Base map the entire degree. Specific puzzle solutions taking into account the indirect side of the ease of map sheet and geographical complexity of the specific elements of implementation. For example, the map sheet number for the F-50-1,[link widoczny dla zalogowanych], F a 50-2, F a 50-5, F 50-6 in the four topographic map of a piece together, the west close to the central meridian, easy and adjacent graph Edge . Finally, a good topographic base map mosaic leaders Freehand software as a base map drawing realm. 3.3 The state should pay attention to the problem of drawing in the computer drawing realm, there are also many problems that need attention, some of the basic principles to follow in section 2.3 in this paper has to be elaborated in detail here to add a number of points. Usually at the provincial level administrative boundaries of cities at prefectural level administrative boundaries of county-level administrative Huajie are dotted through the composition of different forms of symbolic representation. Two black spots for a short notation provincial boundaries, the two black dots in a short-term municipal boundaries,[link widoczny dla zalogowanych], a black spot on a short-term, said county boundaries. In describing boundaries must be the real part (point, line end and line draw program) configuration of the line in obvious turns, shown in Figure 1. The junction of the boundaries, the same symbol boundary points should be expressed or by real part symbol boundaries, can not intersect the imaginary part, shown in Figure 2. / J. One by one. f people one by one a single line in Figure 2 to the river as the boundary line, sometimes after a short river (the figure encountered this problem many county boundaries), not by jumping painting, this time as a line drawn from the river boundary off directly to the section of the river as the boundary. It should be noted at the boundary of the break to complete a whole paragraph should be appropriate line symbol shown in Figure 3. ,,. , A //,~/, Figure 3 a ', . One. ~ , Some residents near the boundary of the land if the comprehensive principle by residents to be expressed, its location may be a good pressure in the line is, the time should be shifted a little ring symbol, the right that its administrative relationship. 4 Summary In this paper, the actual production process, explained the 1:1 million demarcation demarcation on the results of topographic maps reflect as accurately as possible to the 1:70 million Among them, the boundaries of the manual step by step transfer standard and map projection transformation is to a large scale topographic base map data into the boundary used in mapping the boundaries of the key. When based on small scale maps in order to maintain the position of map elements between (between) the correctness of the main principles of accuracy in the second, deal with the issue of the accuracy of the map boundaries.
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