CN103544735A - DEM data color matching and drawing method and device - Google Patents
DEM data color matching and drawing method and device Download PDFInfo
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- CN103544735A CN103544735A CN201310503866.XA CN201310503866A CN103544735A CN 103544735 A CN103544735 A CN 103544735A CN 201310503866 A CN201310503866 A CN 201310503866A CN 103544735 A CN103544735 A CN 103544735A
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Abstract
The invention provides a DEM data color matching and drawing method and device. The method comprises the steps of acquiring the elevation values of all pixel points in DEM data, determining an h value, an s value and a v value of the current pixel point according to the correspondence between the elevation value and the preset elevation value of the current pixel point and an HSV color wheel, calculating a red R value, a green G value and a blue B value of a RGB color model of the current pixel point according to the determined h value, the determined s value and the determined v value, using the calculated R value, the calculated G value and the calculated B value as the color matching values of the current pixel point and drawing the DEM data according to the color matching values of each pixel point. By means of the DEM data color matching and drawing method and device, a drawing vision effect is enhanced, and user experience is improved.
Description
Technical field
The present invention relates to dem data cartography field, in particular to color matching and drafting method and the device of dem data.
Background technology
Current, both at home and abroad for DEM(Digital Elevation Model, digital elevation model) expression has launched broad research, wherein, mainly concentrate on the multi-scale expression of general dem data, the aspects such as composite mapping of regional extent dem data, the color matching of dem data is the basis that dem data is expressed.The color matching of current dem data adopts Geographical Information Sciences (GIS, Geographic Information System) software to carry out computer aided drawing conventionally, and wherein, the expressive function of dem data has become a standard feature module of GIS software.
The method that GIS software adopts conventionally at present comprises: first, adopt statistics with histogram method to classify to the height value of dem data; Then, sorted dem data is matched colors after random assignment in the span of gray scale or RGB color model.Although the method can realize by the color matching functions of its general dem data the expression of dem data,, this random assignment color matching makes the drawing of dem data not attractive in appearance, and user experience is poor.
Summary of the invention
The object of the present invention is to provide a kind of color matching and drafting method and device of dem data, to address the above problem.
Color matching and drafting method that a kind of dem data is provided in an embodiment of the present invention, comprising: the height value of obtaining one by one each pixel in dem data; According to the corresponding relation of the height value of current pixel point and default height value and HSV colour wheel, determine form and aspect h value, saturation degree s value and the lightness v value of described current pixel point; According to the described h value of determining, s value and v value, calculate red R value, green G value and the blue B value of the RGB color model of described current pixel point; Color matching value using the described R value, G value and the B value that calculate as described current pixel point; According to the color matching value of described each pixel, described dem data is charted.
A kind of color matching and drawing device of dem data are also provided in an embodiment of the present invention, have comprised: height value acquisition module, for obtaining one by one the height value of each pixel of dem data; Hsv value determination module, for determining form and aspect h value, saturation degree s value and the lightness v value of described current pixel point according to the corresponding relation of the height value of the definite current pixel point of described height value acquisition module and default height value and HSV colour wheel; Rgb value computing module, for calculating red R value, green G value and the blue B value of the RGB color model of described current pixel point according to the definite described h value of described hsv value determination module, s value and v value; Drawing module, the color matching value for described R value, G value and B value that described rgb value computing module is calculated as described current pixel point, charts to described dem data according to the color matching value of described each pixel.
The said method that the embodiment of the present invention provides and device, obtain the height value of each pixel in dem data by circulating one by one; According to height value, calculate form and aspect, saturation degree and the lightness of HSV colour wheel, and then obtain the rgb value of the RGB color model of each pixel, again according to rgb value to the dem data expression of charting, without manual intervention, avoided the color confusion that the random color matching of dem data is caused, the inaesthetic problem of charting, has strengthened the visual effect of drawing, and then has promoted user's Experience Degree.
Accompanying drawing explanation
Fig. 1 shows the color matching of dem data and the process flow diagram of drafting method that the embodiment of the present invention provides;
Fig. 2 shows the color matching and drawing device of the dem data that the embodiment of the present invention provides
Structured flowchart.
Embodiment
Below by specific embodiment, also by reference to the accompanying drawings the present invention is described in further detail.
The embodiment of the present invention is based on HSV(Hue, Saturation, Value, form and aspect, saturation degree, lightness) colour wheel matches colors automatically to dem data, is applicable to the dem data of global range.Below by embodiment, be described.
The color matching of dem data shown in Figure 1 and the process flow diagram of drafting method, the method comprises the following steps:
Step S102, obtains the height value of each pixel in dem data one by one;
Step S104, determines h value, s value and the v value of current pixel point according to the corresponding relation of the height value of current pixel point and default height value and HSV colour wheel; Wherein, the corresponding relation of the height value that this is default and HSV colour wheel can be as required or experience set, the present embodiment is not done concrete restriction;
Step S106, calculates the RGB(Red Green Blue of current pixel point, RGB according to definite h value, s value and v value) R value, G value and the B value of color model;
Step S108, the color matching value using the R value calculating, G value and B value as current pixel point;
Step S110, charts to dem data according to the color matching value of each pixel.
The method of the present embodiment is obtained the height value of each pixel in dem data by circulating one by one; According to height value, calculate form and aspect, saturation degree and the lightness of HSV colour wheel, and then obtain the rgb value of the RGB color model of each pixel, again according to rgb value to the dem data expression of charting, without manual intervention, avoided the color confusion that the random color matching of dem data is caused, the inaesthetic problem of charting, has strengthened the visual effect of drawing, and then has promoted user's Experience Degree.
For simple implementation mode, the present embodiment is according to positive and negative definite its corresponding h, s and the v value of height value, particularly, if the height value of current pixel point is more than or equal to positive zero, according to the h value, s value and the v value that start to determine counterclockwise current pixel point from yellow HSV colour wheel; If the height value of current pixel point is less than or equal to negative zero, according to the h value, s value and the v value that start to determine clockwise current pixel point from blueness HSV colour wheel.Certainly, according to actual needs, also can select the dividing mode of other height value, need not be confined to whether be greater than zero and divide.
During specific implementation, if the height value of current pixel point is more than or equal to positive zero, according to start to determine HSV colour wheel that counterclockwise h value, s value and the v value of current pixel point can comprise following mode from yellow:
1) h value is calculated: when the height value of current pixel point equals positive zero, determine that the h value of current pixel point equals 60; When the height value of current pixel point is greater than zero, and while being less than 4000 meters, according to 2 meters of the every increases of height value, h value subtracts the h value that 1 rule is determined current pixel point; When the height value of current pixel point is more than or equal to 4000 meters, according to 4 meters of the every increases of height value, h value subtracts the h value that 1 rule is determined current pixel point;
2) s value is calculated: according to formula s=1-k/2
14determine the s value of current pixel point, wherein, the height value that k is current pixel point; Can make like this s value be controlled between 0.5 to 1;
3) v value is calculated: when the height value of current pixel point is more than or equal to positive zero, and while being less than 4000 meters, according to formula v=1-k/2
14determine the v value of current pixel point, can guarantee that v value is controlled between 0.75 to 1; When the height value of current pixel point is more than or equal to 4000 meters, according to formula, be v=1-k/2
15determine the v value of current pixel point, can control like this v value between 0.5 to 0.75.
If the height value of current pixel point is less than or equal to negative zero, according to start to determine HSV colour wheel that clockwise h value, s value and the v value of current pixel point can comprise following mode from blueness:
1) h value is calculated: when the height value of current pixel point equals negative zero, determine that the h value of current pixel point equals 240; When the height value of current pixel point is less than zero, and while being greater than-1000 meters, according to 20 meters of the every increases of height value, h value adds the h value that 1 rule is determined current pixel point; When the height value of current pixel point is less than or equal to-1000 meters, according to 100 meters of the every increases of height value, h value adds the h value that 1 rule is determined current pixel point;
2) s value is calculated: according to formula s=-k/2
16determine the s value of current pixel point, wherein, the height value that k is current pixel point; Can make like this s value be controlled between 0.5 to 1;
3) v value is calculated: when the height value of current pixel point is less than or equal to negative zero, and while being greater than-1000 meters, according to formula v=0.5+k/2
12determine the v value of current pixel point, can control like this v value between 0.25 to 0.5; When the height value of current pixel point is less than or equal to 1000 meters, according to formula, be v=0.25+k/2
15determine the v value of current pixel point, can control like this v value between 0 to 0.25.
Positive zero-sum negative zero in above-described embodiment is in order to distinguish the color matching initial value of DEM, is greater than zero and starts value from yellow, and be less than zero, from blueness, starts value.
Enumerate a concrete example below, described implementation step is described further.
The first step, the height value k of dem data is obtained in circulation.For example, the dem data of Chinese scope of take is example, from left to right, and the bottom-up height value of obtaining dem data by row_column cycle.
Second step, if current height value k is greater than zero, selects the color matching rule 1 of setting, calculates form and aspect h, saturation degree s and the lightness v of HSV colour wheel according to height value, and computing method are as follows:
(1) calculate hue value h, from yellow, start HSV colour wheel, to get colors counterclockwise, when height value equals positive zero, select yellow, now h value equals 60; When height value k is greater than zero while being less than 4000 meters, 2 meters of every increases of elevation subtract 1 for h value; When height value is greater than 4000 meters, 4 meters of h values of the every increase of elevation subtract 1;
(2) calculate saturation degree s, the span of s is controlled between 0.5 to 1, and computing formula is s=1-k/2
14;
(3) calculate lightness v, when height value is less than 4000 meters, the span of v is controlled between 0.75 to 1, and computing formula is v=1-k/2
14; When height value is greater than 4000 meters, the span of v is controlled between 0.5 to 0.75, and computing formula is v=1-k/2
15;
The 3rd step, if current height value k is less than zero, selects the color matching rule 2 of setting, calculates form and aspect h, saturation degree s and the lightness v of HSV colour wheel according to height value, and computing method are as follows:
(1) calculate hue value h, from blueness, start HSV colour wheel, to get colors clockwise, when height value equals negative zero, select blueness, now h value equals 240; When height value is between-1000 to 0, every 20 meters of h values add 1; When height value is less than-1000, every 100 meters of h values add 1;
(2) calculate saturation degree s, the span of s is controlled between 0 to 0.5, and computing formula is s=-k/2
16;
(3) calculate lightness v, when height value is greater than-1000 meters, the span of v is controlled between 0.25 to 0.5, and computing formula is v=0.5+k/2
12; When height value is less than-1000 meters, the span of v is controlled between 0 to 0.25, and computing formula is v=0.25+k/2
15;
The 4th step, calculates form and aspect h, the saturation degree s of HSV colour wheel and the R that lightness v calculates RGB color model, G, B value according to step 2 and step 3;
The 5th step, the rgb value obtaining according to circulation, shows the dem data after color matching.
Corresponding to said method, the embodiment of the present invention also provides a kind of color matching and drawing device of dem data, and referring to Fig. 2, this device comprises with lower module:
Height value acquisition module 22, for obtaining one by one the height value of each pixel of dem data;
Hsv value determination module 24, for determining form and aspect h value, saturation degree s value and the lightness v value of current pixel point according to the corresponding relation of the height value of the definite current pixel point of height value acquisition module 22 and default height value and HSV colour wheel;
Rgb value computing module 26, for calculating red R value, green G value and the blue B value of the RGB color model of current pixel point according to the definite h value of hsv value determination module 24, s value and v value;
The device of the present embodiment obtains the height value of each pixel in dem data by circulating one by one; According to height value, calculate form and aspect, saturation degree and the lightness of HSV colour wheel, and then obtain the rgb value of the RGB color model of each pixel, again according to rgb value to the dem data expression of charting, without manual intervention, avoided the color confusion that the random color matching of dem data is caused, the inaesthetic problem of charting, has strengthened the visual effect of drawing, and then has promoted user's Experience Degree.
Particularly, hsv value determination module 24 comprises: the first determining unit, if be more than or equal to positive zero for the height value of current pixel point, according to the h value, s value and the v value that start to determine counterclockwise current pixel point from yellow HSV colour wheel; The second determining unit, if be less than or equal to negative zero for the height value of current pixel point, according to the h value, s value and the v value that start to determine clockwise current pixel point from blueness HSV colour wheel.
Corresponding to above-mentioned regular 1, the first determining unit, specifically can comprise: a h value is determined subelement, while equaling positive zero for the height value when current pixel point, determine that the h value of current pixel point equals 60; When the height value of current pixel point is greater than zero, and while being less than 4000 meters, according to 2 meters of the every increases of height value, h value subtracts the h value that 1 rule is determined current pixel point; When the height value of current pixel point is more than or equal to 4000 meters, according to 4 meters of the every increases of height value, h value subtracts the h value that 1 rule is determined current pixel point; The one s value is determined subelement, for according to formula s=1-k/2
14determine the s value of current pixel point, wherein, the height value that k is current pixel point; The one v value is determined subelement, for being more than or equal to positive zero when the height value of current pixel point, and while being less than 4000 meters, according to formula v=1-k/2
14determine the v value of current pixel point; When the height value of current pixel point is more than or equal to 4000 meters, according to formula, be v=1-k/2
15determine the v value of current pixel point.
Corresponding to above-mentioned regular 2, the second determining units, can specifically comprise: the 2nd h value is determined subelement, while equaling negative zero for the height value when current pixel point, determine that the h value of current pixel point equals 240; When the height value of current pixel point is less than zero, and while being greater than-1000 meters, according to 20 meters of the every increases of height value, h value adds the h value that 1 rule is determined current pixel point; When the height value of current pixel point is less than or equal to-1000 meters, according to 100 meters of the every increases of height value, h value adds the h value that 1 rule is determined current pixel point; The 2nd s value is determined subelement, for according to formula s=-k/2
16determine the s value of current pixel point, wherein, the height value that k is current pixel point; The 2nd v value is determined subelement, for being less than or equal to negative zero when the height value of current pixel point, and while being greater than-1000 meters, according to formula v=0.5+k/2
12determine the v value of current pixel point; When the height value of current pixel point is less than or equal to 1000 meters, according to formula, be v=0.25+k/2
15determine the v value of current pixel point.
The above embodiment of the present invention is mainly matched colors to dem data automatically based on HSV colour wheel, by circulation, obtain the height value of dem data, according to height value, determine color matching rule again, then calculate respectively form and aspect h, saturation degree s and the lightness v of the corresponding HSV colour wheel of height value, the R that calculates RGB color model according to form and aspect h, saturation degree s and the lightness v of HSV colour wheel again, G, B value.This method has reduced the statistics with histogram step of classic method, and without manual intervention, has avoided the random color matching to dem data, has realized consistent, the attractive in appearance drawing of global dem data and has expressed.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in memory storage and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the color matching of digital elevation model dem data and a drafting method, is characterized in that, comprising:
Obtain one by one the height value of each pixel in dem data;
According to the corresponding relation of the height value of current pixel point and default height value and HSV colour wheel, determine form and aspect h value, saturation degree s value and the lightness v value of described current pixel point;
According to the described h value of determining, s value and v value, calculate red R value, green G value and the blue B value of the RGB color model of described current pixel point;
Color matching value using the described R value, G value and the B value that calculate as described current pixel point;
According to the color matching value of described each pixel, described dem data is charted.
2. method according to claim 1, is characterized in that, according to the height value of current pixel point and default height value and the corresponding relation of HSV colour wheel, determines that h value, s value and the v value of described current pixel point comprise:
If the height value of current pixel point is more than or equal to positive zero, according to the h value, s value and the v value that start to determine counterclockwise described current pixel point from yellow HSV colour wheel;
If the height value of current pixel point is less than or equal to negative zero, according to the h value, s value and the v value that start to determine clockwise described current pixel point from blueness HSV colour wheel.
3. method according to claim 2, is characterized in that, if the height value of current pixel point is more than or equal to positive zero, according to start to determine HSV colour wheel that counterclockwise h value, s value and the v value of described current pixel point comprise from yellow:
When the height value of described current pixel point equals positive zero, determine that the h value of described current pixel point equals 60; When the height value of described current pixel point is greater than zero, and while being less than 4000 meters, according to 2 meters of the every increases of height value, h value subtracts the h value that 1 rule is determined described current pixel point; When the height value of described current pixel point is more than or equal to 4000 meters, according to 4 meters of the every increases of height value, h value subtracts the h value that 1 rule is determined described current pixel point;
According to formula s=1-k/2
14determine the s value of described current pixel point, wherein, the height value that k is described current pixel point;
When the height value of described current pixel point is more than or equal to positive zero, and while being less than 4000 meters, according to formula v=1-k/2
14determine the v value of described current pixel point; When the height value of described current pixel point is more than or equal to 4000 meters, according to formula, be v=1-k/2
15determine the v value of described current pixel point.
4. method according to claim 2, is characterized in that, if the height value of current pixel point is less than or equal to negative zero, according to start to determine HSV colour wheel that clockwise h value, s value and the v value of described current pixel point comprise from blueness:
When the height value of described current pixel point equals negative zero, determine that the h value of described current pixel point equals 240; When the height value of described current pixel point is less than zero, and while being greater than-1000 meters, according to 20 meters of the every increases of height value, h value adds the h value that 1 rule is determined described current pixel point; When the height value of described current pixel point is less than or equal to-1000 meters, according to 100 meters of the every increases of height value, h value adds the h value that 1 rule is determined described current pixel point;
According to formula s=-k/2
16determine the s value of described current pixel point, wherein, the height value that k is described current pixel point;
When the height value of described current pixel point is less than or equal to negative zero, and while being greater than-1000 meters, according to formula v=0.5+k/2
12determine the v value of described current pixel point; When the height value of described current pixel point is less than or equal to 1000 meters, according to formula, be v=0.25+k/2
15determine the v value of described current pixel point.
5. the color matching of digital elevation model dem data and a drawing device, is characterized in that, comprising:
Height value acquisition module, for obtaining one by one the height value of each pixel of dem data;
Hsv value determination module, for determining form and aspect h value, saturation degree s value and the lightness v value of described current pixel point according to the corresponding relation of the height value of the definite current pixel point of described height value acquisition module and default height value and HSV colour wheel;
Rgb value computing module, for calculating red R value, green G value and the blue B value of the RGB color model of described current pixel point according to the definite described h value of described hsv value determination module, s value and v value;
Drawing module, the color matching value for described R value, G value and B value that described rgb value computing module is calculated as described current pixel point, charts to described dem data according to the color matching value of described each pixel.
6. device according to claim 5, is characterized in that, described hsv value determination module comprises:
The first determining unit, if be more than or equal to positive zero for the height value of current pixel point, according to the h value, s value and the v value that start to determine counterclockwise described current pixel point from yellow HSV colour wheel;
The second determining unit, if be less than or equal to negative zero for the height value of current pixel point, according to the h value, s value and the v value that start to determine clockwise described current pixel point from blueness HSV colour wheel.
7. device according to claim 6, is characterized in that, described the first determining unit comprises:
The one h value is determined subelement, while equaling positive zero for the height value when described current pixel point, determines that the h value of described current pixel point equals 60; When the height value of described current pixel point is greater than zero, and while being less than 4000 meters, according to 2 meters of the every increases of height value, h value subtracts the h value that 1 rule is determined described current pixel point; When the height value of described current pixel point is more than or equal to 4000 meters, according to 4 meters of the every increases of height value, h value subtracts the h value that 1 rule is determined described current pixel point;
The one s value is determined subelement, for according to formula s=1-k/2
14determine the s value of described current pixel point, wherein, the height value that k is described current pixel point;
The one v value is determined subelement, for being more than or equal to positive zero when the height value of described current pixel point, and while being less than 4000 meters, according to formula v=1-k/2
14determine the v value of described current pixel point; When the height value of described current pixel point is more than or equal to 4000 meters, according to formula, be v=1-k/2
15determine the v value of described current pixel point.
8. device according to claim 6, is characterized in that, described the second determining unit comprises:
The 2nd h value is determined subelement, while equaling negative zero for the height value when described current pixel point, determines that the h value of described current pixel point equals 240; When the height value of described current pixel point is less than zero, and while being greater than-1000 meters, according to 20 meters of the every increases of height value, h value adds the h value that 1 rule is determined described current pixel point; When the height value of described current pixel point is less than or equal to-1000 meters, according to 100 meters of the every increases of height value, h value adds the h value that 1 rule is determined described current pixel point;
The 2nd s value is determined subelement, for according to formula s=-k/2
16determine the s value of described current pixel point, wherein, the height value that k is described current pixel point;
The 2nd v value is determined subelement, for being less than or equal to negative zero when the height value of described current pixel point, and while being greater than-1000 meters, according to formula v=0.5+k/2
12determine the v value of described current pixel point; When the height value of described current pixel point is less than or equal to 1000 meters, according to formula, be v=0.25+k/2
15determine the v value of described current pixel point.
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