测绘工程外文翻译文献
D,complete the chart profile changes, data editing, data access side, topology reconstruction, data storage and other data processing and construction of library work;
E,with maps for Edge: The picture on the right (1954 Beijing coordinate system) then left (China Geodetic Coordinate System ), the first picture on the right of the ellipsoid to bring change and change in the use of the left with left of motion for the coordinates of picture on the right translation, completed and saved then in the left side with the picture on the right (back up) results. Back to picture on the right to withdraw for Edge to join the pan with the amount, and the projection transformation, and finally use the right amount of completion of the translation with their own translation before they are allowed access to its adjacent picture on the right side;
F,on the basis of geographic information database metadata associated changes entries.
(2)1980 Xi'an coordinates 1:2.5-1:10 million DLG Database Conversion
Framing according to the relevant regional division of scale, without regard to ellipsoid transform, directly corresponding to the scale regional maps X, Y coordinates of displacement is to coordinate translation; and then follow the 1954 Beijing DLG database coordinate system transformation b ~ f the corresponding steps.
2,1:2.5-1:10 million DRG Database Conversion
The original data 300 ~ 500dpi scan of original printed maps to correct generated by the RGB raster data, no maps between the elements of Edge Treatment.
(1) 1954 Beijing coordinates 1:2.5-1:10 million DRG Database Conversiona、
A,consider the ellipsoid transformation and the corresponding map c
测绘工程外文翻译文献
ontour corner of the X, Y coordinate translation, calculation coordinate system in 1954, Beijing Drawing of profile corner in the China Geodetic Coordinate System coordinates, and modify the appropriate header files positioning coordinates;
B,in the 2000 National DRG data superimposed on the earth coordinate system based on the new geodetic control layer (Fig. profile and square in the grid, etc.), the new chart profile data or data gaps do not do a chart pattern for the region to complement and reduction;
C,in the legend to add 2,000 National Geodetic Coordinate System Control base note of new terms;
D,the data layer was completed, and keep the original resolution of DRG data;
E,change the metadata related to content, increase the standard of the 1954 Beijing Framing coordinates four corners of points in the plan profile China Geodetic Coordinate System coordinates, calculating in 2000 the national standard geodetic coordinate system profile corners framing the map coordinates of points.
The converted data for China Geodetic Coordinate System coordinates, coordinates 1954 Beijing Framing.
(2) 1980 Xi'an coordinates 1:2.5-1:10 million DRG Database Conversion
Get maps corresponding contour map scale maps corner of the X, Y coordinate shift amount calculation under the shift maps positioning coordinates, modify the header file; and then follow the coordinates to the 1954 Beijing National Geodetic Coordinate System 2000 1:2.5 -1:10 million DRG database conversion b ~ e steps.
The converted data for China Geodetic Coordinate System coordinates, coordinates of Xi'an in 1980, Framing.
3,1:2.5-1:10 million DEM Database Conversion
The original data of 25 meter resolution grayscale (256) raster data,
测绘工程外文翻译文献
library data, maps indirect edge processing intact. This data conversion can be in two ways: one is based on the China Geodetic Coordinate System related to layer DLG data (contour lines, elevation points) to re-generate DEM (see DEM data production specifications), one is for DEM data conversion. The following are given DEM data conversion methods.
(1) 1954 Beijing coordinates 1:2.5-1:10 million DEM Database Conversion
A,in accordance with the scale corresponds to block maps, the need to add the contents of the adjacent side of the addition of a corresponding scale maps;
B,consider the ellipsoid transformation and the corresponding scale maps of the X, Y coordinate translation volume, obtained by X, Y coordinates of corrections;
C,the coordinate correction value maps coordinate translation, the same time, the starting coordinates of reference pixel resolution data to determine re-sampling;
D,by 2000 the new national geodetic coordinate system and the overlapping pixel map contour maps crop, change the header file positioning coordinates;
E,modify the meta data related to entry.
(2) 1980 Xi'an coordinates 1:2.5-1:10 million DEM Database Conversiona
A,in accordance with the scale corresponds to the corresponding block maps, the need to add the contents of the adjacent side of the addition of a corresponding scale maps;
B,according to the corresponding scale maps of the X, Y coordinate translation capacity for maps coordinate translation and reference pixel resolution to determine the starting coordinates for data re-sampling;
测绘工程外文翻译文献
C,according to the 1954 Beijing coordinates 1:2.5-1:10 million DEM database conversion d, e steps.
4,1:25 million DLG Database Conversion
(1) 1:25 extreme increase of the plane coordinate shift amount is converted to the corresponding longitude and latitude, or direct access to the corresponding shift amount of economic and maps, latitude shift amount;
(2) The extreme amplitude by 1:25, latitude shift amount, latitude and longitude data to complete the 1:25 10 000 2000 National Geodetic latitude and longitude coordinate data conversion (1954 Beijing coordinate system taking into account the need to change and shift ellipsoid volume);
(3) based on 2000 National Geodetic coordinates corresponding to the standard of 1:25 million data profile and Drawing cutting edge of the region maps the data in the blank area adjacent maps using data added;
(4) data processing, including: graph profile changes, add new grid layer, data editing, data access side, topology reconstruction, data storage, etc.;
(5) to change the metadata file.
5,1:25 million DEM Database Conversion
(1) the use of National Geodetic Coordinate System 2000 DLG data layers corresponding to re-interpolation generated DEM;
(2) changes under the new DEM metadata file. 2. Database established by other means
1, the establishment of the graphics database by region
By region (province, region, watershed, etc.) to establish the graphics database (DLG, DEM, DRG), can block the first sub-layer with the
测绘工程外文翻译文献
completion of conversion, refer to the above basic geographic information database corresponding scale conversion program converted mosaic synthesis.
1:10 10 000 -1:25 10 000 database, the database conversion program by 1:25 million conversion block by block, then the overall mosaic synthesis; by way of non-Gaussian projection organization, the original latitude and longitude data network 30 '× 30' or 15 '× 15' intersection as the coordinate conversion reference points to calculate the reference points in the China Geodetic Coordinate System coordinates graphics using GIS software to correct, complete data conversion.
2, according to the linear band graphic database established By linear bands (state, river, lines, pipes lines, etc.) to establish the graphics database, can be based on the direction of bands, the length of such section were then spliced synthesis; also can strip ground points in a certain density The two sets of coordinates, point by point through the software to correct. Specific methods:
block to correct: extreme blocks for 1:1, 1:1 million, according to data conversion, followed by side-by-block to correct synthesis; for extremely 1:5 block, according to 1:2.5-1:10 million to correct data conversion program block by block Edge after synthesis;
corrected point by point: According to data accuracy, the establishment of a certain density (1:1 million 100 MiG outlets, 1:5 million in 2000 MiG outlets) of the coordinate conversion reference points to calculate the reference points in the new coordinate system of coordinates, using GIS software for data conversion.
3, no fixed points increase by the establishment of the graphics database partition
Increase by no fixed points to establish the graphical data area, according to coordinates, scale and data subject where the maps, data, orga