CN1719443A - Establishing technology of global geographical information library - Google Patents
Establishing technology of global geographical information library Download PDFInfo
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- CN1719443A CN1719443A CN 200510041088 CN200510041088A CN1719443A CN 1719443 A CN1719443 A CN 1719443A CN 200510041088 CN200510041088 CN 200510041088 CN 200510041088 A CN200510041088 A CN 200510041088A CN 1719443 A CN1719443 A CN 1719443A
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Abstract
The present invention relates to a technique for creating global geographical information pool. It is characterized by that said technique directly uses block-scanned map or satellite photograph as horizon, and uses the picture size to be displayed by screen as said picture block boundary to cut said picture block, and utilizes the longitude and latitude value of central point of every picture block as picture name of said picture block, so that it can make every pixel of said picture not only have its colour value, but also contain the longitude and latitude valve of said point.
Description
Technical field
What the present invention relates to is the technology of setting up of geographic information processing application technology, particularly global geographical information library.
Background technology
The method of people's common store geography information has at present: the one, and traditional method is as paper map or satellite photo; The 2nd, use the method for digitizing that produces with computer technology.Digitized geography information is divided into two classes substantially, and a class is a bitmap class map; Another kind of is polar plot class map.
Bitmap class map is with scanner scanning or with satellite the ground digital vedio recording to be stored in the disk one class medium with bitmap (or claiming grid map) form.Its advantage is to make easily, and display speed is fast; Shortcoming is to attach property value.
Polar plot class map uses general Geographic Information System (GIS) software such as MapInfo to carry out secondary development at present at home and abroad substantially and forms.Promptly point, the lines of paper map or satellite photo and the zone that is surrounded by closed line are retraced as object, and after adding the latitude and longitude value and other value of information (title attribute) of this object, be stored in the disk one class medium with the polar plot form.Its advantage is each object separately to be shown or do other processing, can also carry out topological analysis to its property value and handle; Shortcoming is that the digitizing workload is big, the former figure visual informations of difficult all reflections, and display speed can be slack-off during to certain amount when content and scope, even can't normally move.If polar plot class geography information software is with the map of scanner scanning or satellite photo (grid base map) directly as a setting, the drawing size that can normally show be subjected to the restriction of calculator memory; If with several grid base map splicings, can only use a pair of registration reduced parameter during demonstration, the segment that has only first width of cloth to pack into shows correct, and other segments will cause showing conversion error.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art part, a kind of whole visual informations that can reflect former map or satellite photo are provided, each pixel longitude and latitude property value can be provided again, and can reduce the technology of setting up of the global geographical information library of digitizing workload.
Purpose of the present invention can be achieved by the following scheme.
The technology of setting up of global geographical information library, system directly the use map of blocked scan or satellite photo as prospect, cut this segment with the drawing size that screen will show for this figure block boundary, form the map title of this segment with the latitude and longitude value of every figure central point, thereby make each pixel of drawing except that its color value, also comprise the latitude and longitude value of this point.Its concrete technology comprises: obtain former map projective parameter, dispose scanner, choose the scanning resolution, also comprise the steps: simultaneously
1, according to the predetermined scanning resolution of wanting the display screen dimension of picture and choosing, determines map piecemeal amplitude;
2, according to the map piecemeal amplitude of determining, scan with the optimum scanning resolution of choosing;
3, downcut segment with the block size of determining, and be that the map title is preserved with its longitude and latitude coordinate of central point;
4, set up preservation map file.
The present invention contrasts prior art and has following advantage: the drawing content and the former projective parameter of this segment that 1, need the current visual window ranges of having only of graftabl, the drawing amount that enables to show is not subjected to the restriction of calculator memory, can both normally show as long as hard disk can hold the global drawing of any kind or scale maps; Can use registration parameter separately when 2, showing respectively, show that the optional position drawing does not have conversion error; The segment graftabl that directly will show when 3, showing directly uses scanning map making prospect, realizes in the world arbitrarily movable picture or jumps to the optional position drawing and do not have pause, realizes that simultaneously the global warp-wise of drawing moves non-boundary; 4, significantly reduce the digitizing workload, thereby increase work efficiency, reduce cost of manufacture.
Embodiment
Be example so that 1: the 1000000 administrative figure in Fujian Province is joined global geographical information library now, its method for making is:
1. obtain former map projection.By this paper map explanation, this map is Gauss-Ke Lv projection.
2. configuration is fit to scanner.The PC display screen is basic laterally suitable with A4 at present, should select to install more than the breadth A4 color scanner that resolution 300dpi is above.
3. the predetermined display screen dimension of picture of wanting.As to get wide * height be 800 * 600 pixels.
4. choose the scanning resolution.Select a resolution to carry out prescan, on screen, showed, check its effect with 1: 1.According to predetermined screen image display size, in conjunction with display effect, take into account the principle of being convenient to divide the branch block boundary, adjust the scanning resolution.Adjusting through showing, is the scanning resolution of this figure with the 75dpi resolution.
5. determine the piecemeal amplitude.Want display screen dimension of picture (800 * 600 pixel) can all comprise maximum segment content according to predetermined, and can occupy the principle of major part (more than 90%) screen space, determine map piecemeal amplitude (warp * latitude is 60 minutes * 40 minutes), and on each piecemeal reference mark of paper figure, do "+" mark.Territory, Fujian Province scope is a warp-wise: east longitude 115 is spent between east longitude 121 degree, broadwise: north latitude 23 is spent between north latitude 28 degree.The warp-wise framing is 1 degree, divides block boundary to overlap through gauze with whole degree, so just begin to divide 6 between east longitude 121 degree from east longitude 115 degree; The broadwise piecemeal is 40 minutes, and per 3 is 2 degree, and according to Fujian Province's actual range, its south does not exceed north latitude 23 degree 20 minutes, and the north does not exceed north latitude 27 degree 20 minutes, divides block boundary to begin in 20 minutes to 8 of 20 fens branches of north latitude 27 degree from north latitude 23 degree so get south.From saying that totally being divided into is 48 because the actual area border is not square, when monoblock all outside the zone boundary can except.
6. according to the map piecemeal amplitude of determining, scan with the optimum scanning resolution of choosing.Should keep this segment center warp vertical during scanning, and make sweep limit be a bit larger tham the piecemeal scope.
With the block size determined with the symmetrical up and down square cutting-out segment of segment central point, and be that the map title saves as * .bmp figure with figure with the longitude and latitude coordinate of each piece figure central point.
8. map title naming rule is: earlier through after latitude, establish a digit separator thing warp and a north and south latitude before the longitude and latitude, east longitude is 0, west longitude is 1; North latitude is 0, and south latitude is 1; Through 3 of the number of degrees, the front will replenish (all need use with quadrat method additional during the not enough position of other value) with 0 during 3 of less thaies, through 2 of marks, and several 2 through second; Several 2 of latitude, 2 of latitude marks, several 2 of latitude second, promptly filename length is 15, the 1st bit representation east longitude or west longitude, 2-4 position are through the number of degrees, and the 5-6 position is through mark, and the 7-8 position is through number second, the 9th bit representation south latitude or north latitude, 10-11 position latitude number, 12-13 position latitude mark, 14-15 position latitude number second.As the administrative figure center point coordinate in Fujian Province is east longitude 118 degree 30 minutes and 00 second, and 30 minutes 00 second the segment map title of north latitude 26 degree is: 011830000263000.bmp.
9. set up and preserve the map file.Be used to preserve the map and the projective parameter of piecemeal, and the map of different figure classes or different proportion is kept under the different files.Be kept under " qqdtk xzt fjs100w " file as 1: the 1000000 administrative figure in Fujian Province.
Application program is called segment according to required drawing longitude and latitude, calculates the each point longitude and latitude according to former figure projection and figure block scan resolution.
Claims (5)
1, a kind of technology of setting up of global geographical information library comprises the projective parameter of obtaining former map, disposes scanner, chooses the scanning resolution, it is characterized in that, also comprises the steps:
A) according to the predetermined scanning resolution of wanting the display screen dimension of picture and choosing, determine map piecemeal amplitude,
B) according to the map piecemeal amplitude of determining, scan with the optimum scanning resolution of choosing,
C) downcut segment with the block size of determining, and be that the map title is preserved with its longitude and latitude coordinate of central point,
D) set up preservation map file.
2, the technology of setting up of global geographical information library according to claim 1, it is characterized in that described definite map piecemeal amplitude, be according to wanting display screen size, can all comprise maximum segment content, and can occupy the requirement of 90% above screen space and decide.
3, the technology of setting up of global geographical information library according to claim 1 should keep this segment center warp vertical, and make sweep limit be a bit larger tham the piecemeal scope when it is characterized in that scanning.
4, the technology of setting up of global geographical information library according to claim 1 is characterized in that its naming rule of the described map title is: earlier through after latitude, establish a digit separator thing warp and a north and south latitude before the longitude and latitude, east longitude is 0, west longitude is 1; North latitude is 0, and south latitude is 1; Through 3 of the number of degrees, through 2 of marks, several 2 through second; Several 2 of latitude, 2 of latitude marks, several 2 of latitude second, be 15 of filename lengths, the 1st bit representation east longitude or west longitude, the 2-4 position is through the number of degrees, and the 5-6 position is through mark, the 7-8 position is through number second, the 9th bit representation south latitude or north latitude, 10-11 position latitude number, 12-13 position latitude mark, 14-15 position latitude number second all replenishes with 0 in the time of not enough.
5, the technology of setting up of global geographical information library according to claim 1, it is characterized in that described foundation preservation map file is meant map and the projective parameter that is used to preserve piecemeal, and the map of different figure classes or different proportion is kept under the different files.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510041088 CN1719443A (en) | 2005-07-13 | 2005-07-13 | Establishing technology of global geographical information library |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510041088 CN1719443A (en) | 2005-07-13 | 2005-07-13 | Establishing technology of global geographical information library |
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| CN1719443A true CN1719443A (en) | 2006-01-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539939B (en) * | 2009-04-30 | 2012-08-22 | 北京水晶石数字科技股份有限公司 | Method for fast display of vast images |
| CN101782925B (en) * | 2009-01-20 | 2012-08-29 | 阿尔卡特朗讯公司 | Map display method for displaying several layers of buildings to enhance building display |
-
2005
- 2005-07-13 CN CN 200510041088 patent/CN1719443A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782925B (en) * | 2009-01-20 | 2012-08-29 | 阿尔卡特朗讯公司 | Map display method for displaying several layers of buildings to enhance building display |
| CN101539939B (en) * | 2009-04-30 | 2012-08-22 | 北京水晶石数字科技股份有限公司 | Method for fast display of vast images |
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Open date: 20060111 |