JP3543209B2 - Elevation data drawing processing apparatus and recording medium recording elevation data drawing processing program - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides an altitude data drawing method for improving visibility even at a detailed scale level by performing data interpolation based on the altitude data to be used in a process of drawing altitude data to be displayed on a screen of a display device. The present invention relates to a processing device and a recording medium on which an elevation data drawing processing program is recorded.
[0002]
[Prior art]
Conventionally, assuming that altitude data is used, as shown in Japanese Patent Application Laid-Open No. 61-255471, tracing the flow path in the steepest descent direction starting from each point of the digital altitude data, and performing this process for all points of the digital altitude data. Then, a system that automatically creates a water system map by superimposing the obtained flow paths, or, as shown in Japanese Patent Application Laid-Open No. 9-147086, uses elevation data having topographical elevation information in a grid pattern to create 2. Description of the Related Art There is known a method of calculating an inclination angle between a horizontal plane and automatically estimating the inclination of altitude data.
[0003]
[Problems to be solved by the invention]
However, when such altitude data is displayed on a graphic display using a CRT, if the rectangle that is the minimum unit of the altitude data differs from the resolution of the display screen due to the scale level of the altitude data to be displayed, more detailed information is displayed. At the scale level, there is a problem that a rectangle as the minimum unit of the elevation data is clearly displayed on the display screen, and as a result, the rectangle of the minimum unit of the displayed elevation data looks like a mosaic.
[0004]
The present invention solves such a conventional problem, and divides elevation data according to the resolution of a display screen, thereby enabling elevation data display without displaying a mosaic-like elevation data. It is an object of the present invention to provide a processing method and apparatus, and a recording medium recording an elevation data drawing processing program.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is an altitude data drawing processing device for displaying altitude data on a display means, a storage means for storing the altitude data, a data input means for capturing the altitude data from the storage means, A block division determining unit that determines whether a block size, which is the minimum unit of the elevation data input from the data input unit, is coarse with respect to the resolution of the display screen of the display unit, and a minimum unit of the elevation data in the block division determination unit. an interpolation data generating means 1 block size to subdivide the elevation data by generating an interpolation data of the divided elevation data blocks when it is determined that the coarse to the resolution of the display screen, altitude subdivided by the interpolation data generating means Drawing means for drawing based on data.
[0006]
According to the present invention, it is possible to realize display of elevation data that does not look like a mosaic by subdividing the elevation data.
[0007]
The present invention is a recording medium recording an elevation data drawing processing program for displaying elevation data on a display means, wherein a data input step of acquiring the elevation data, and a block size as a minimum unit of the inputted elevation data are displayed on the display means. A determination step for determining whether or not the resolution of the display screen is coarse or not, and an elevation data by creating interpolation data of the elevation data when the determination step determines that the block size of the elevation data is coarse relative to the resolution of the display screen. The present invention relates to a recording medium storing a drawing processing program for causing a computer to execute a step of subdividing data and a step of drawing subdivided elevation data.
[0008]
According to the present invention, it is possible to realize display of elevation data that does not look like a mosaic by subdividing the elevation data.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An invention according to claim 1 of the present invention is an elevation data drawing processing device for displaying elevation data on a display means, comprising a storage means for storing elevation data, a data input means for taking in elevation data from the storage means, A block division determining unit that determines whether the block size, which is the minimum unit of the altitude data input from the data input unit, is coarse with respect to the resolution of the display screen of the display unit, and a block division determining unit that determines the minimum unit of the altitude data. When it is determined that a certain block size is coarse with respect to the resolution of the display screen, the block is divided to create interpolation data of the elevation data, and the elevation data is subdivided. is intended to and a drawing means for drawing on the basis of the altitude data, by subdividing the elevation data, invisible mosaic An effect that can realize a display of high data.
[0010]
The invention according to claim 2 has a display screen correspondence table configured as a table in which the block size and the resolution of the display screen are associated with each other, and the block size is determined by the block division determination unit with reference to the display screen correspondence table. This is to judge whether the resolution of the display screen is not coarse or not. By setting in advance a table of whether or not it looks like a mosaic in the table, it is easy to judge the necessity of data segmentation. Has the effect of being able to.
[0011]
The invention according to claim 3 further includes a block division unit that divides each block of the original elevation data into a plurality of equal parts when the block division determination unit determines that the block size is coarse with respect to the resolution of the display screen. The interpolation data is created for the block size of the original altitude data by calculating the average of the altitude values between the blocks for every four blocks adjacent to the divided block divided by the block dividing means. Blocks are subdivided, and an effect is obtained that sub-blocks can be subdivided into quarters by creating interpolation data with respect to the original block size.
[0012]
According to a fourth aspect of the present invention, there is provided a block dividing unit for dividing each block of the original elevation data into a plurality of equal parts when the block division determining unit determines that the block size is coarse with respect to the resolution of the display screen. The average value of the elevation values between the blocks is obtained by the interpolation data generating means for every four blocks adjacent to the divided block divided by the means, and a new block is obtained by integrating a plurality of the four blocks whose average values have been obtained. The apparatus further includes a block integration unit that creates the data, and has an effect of displaying altitude data that does not look like a mosaic when the altitude data is displayed.
[0013]
The invention according to claim 5 is a recording medium storing an elevation data drawing processing program for displaying the elevation data on a display means, wherein the data input step for capturing the elevation data and the data input step include the input elevation data. A determination step of determining whether the block size, which is the minimum unit of the display screen, is coarse with respect to the resolution of the display screen of the display means, and dividing the block when the determination step determines that the block size is coarse with respect to the resolution of the display screen. A step of subdividing the elevation data by creating interpolation data of the elevation data , and a recording medium that records a rendering processing program for causing a computer to execute a rendering step of rendering based on the subdivided elevation data, By subdividing the elevation data, it is possible to display elevation data that does not look like a mosaic. It has the effect of.
[0014]
According to a sixth aspect of the present invention, in the determination step, the block size is not coarse with respect to the resolution of the display screen by referring to a display screen correspondence table in which the block size is associated with the resolution of the display screen in a table. A drawing processing program that allows the computer to determine whether or not the data is visible is set in advance in the table. It has the effect of being able to judge.
[0015]
According to a seventh aspect of the present invention, in the determining step, when it is determined that the block size is coarse with respect to the resolution of the display screen, each block of the original altitude data is divided into a plurality of equal parts, and the divided blocks are divided. A program for generating interpolation data for the block size of the original elevation data by calculating the average value of the elevation values between the blocks for every four adjacent blocks, and subdividing the blocks of the elevation data. By creating interpolation data with respect to the original block size, there is an effect that the block size can be subdivided into 1/4.
[0016]
In the invention according to claim 8, when the block size is determined to be coarse with respect to the resolution of the display screen, each block which is the minimum unit of the elevation data is divided into a plurality of equal parts, and the divided division is performed. A recording medium for recording a program for calculating an average value of elevation values between blocks for every four blocks adjacent to the block, and integrating a plurality of the four blocks for which the average values have been calculated to create a new block; Has the effect of displaying altitude data that does not look like a mosaic when displaying altitude data.
[0017]
Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a functional block diagram showing an example of an altitude data drawing processor according to the present invention, FIG. 2 is a block diagram showing a computer constituting the altitude data drawing processor of FIG. 1, and FIG. 3 is an altitude data drawing processor of FIG. FIG. 4 to FIG. 7 are explanatory diagrams of the altitude data drawing processing in the present embodiment.
[0018]
Hereinafter, an example of the altitude data drawing processing apparatus of the present invention will be described with reference to these drawings, and at the same time, a recording medium on which an altitude data drawing processing method and an altitude data drawing processing program of the present invention are recorded will be described.
[0019]
The altitude data drawing processing device according to the embodiment of the present invention is configured by the personal computer 1 shown in FIG. The personal computer 1 includes a CPU 2, an input unit 3 such as a keyboard and a mouse, an internal storage unit 4 such as a RAM, an external storage unit 5 including a hard disk device, and a display unit 6 such as a CRT. The function of each unit shown in FIG. 1, which will be described in detail later, loads predetermined program data necessary for the altitude data drawing process of the present invention from the external storage unit 5 into the internal storage unit 4 of the personal computer 1, and executes this program. This is realized by operating the CPU 2 based on the data. Further, the external storage unit 5 stores elevation data used in the embodiment of the present invention. Further, the external storage means 5 includes a recording medium 5A such as a floppy disk on which predetermined program data necessary for the altitude data drawing processing of the present invention is recorded.
[0020]
Next, the configuration of the elevation data drawing processing apparatus shown in FIG. 1 will be described. The elevation data drawing processing apparatus according to the present embodiment includes an elevation data storage unit 11 for storing input elevation data used for the drawing processing. An altitude data subdividing unit 12 that subdivides the altitude data input from the altitude data storage unit 11, a display screen correspondence table 13 for determining the necessity of subdividing the size of one block, and an altitude data subdividing unit. An altitude data rendering unit 14 for rendering the altitude data created by the processing unit 12 and a display unit 15 for displaying the altitude information that has been rendered.
[0021]
The input altitude data stored in the altitude data storage means 11 includes a representative point in a rectangular unit as altitude data to be used.
[0022]
The elevation data subdivision unit 12 includes a data input unit 121, a block division determination unit 122, a block division instruction unit 123, a block division unit 124, an interpolation data creation unit 125, a block integration unit 126, and a data output unit 127.
[0023]
The data input unit 121 is configured to read and read input elevation data necessary for drawing from the elevation data storage unit 11. The block division determining unit 122 determines whether or not the input altitude data looks like a mosaic on the display screen with reference to the display screen correspondence table 13, and outputs the determination result to the block division instructing unit 123. The block division instructing unit 123 instructs the block dividing unit 124 to divide the block of the elevation data. The block dividing unit 124 divides the block into 16 equal parts according to the block dividing instruction from the block dividing instruction unit 123.
[0024]
The interpolation data creation unit 125 calculates the average value of the divided blocks divided by the block division unit 124 for each of the four divided blocks in consideration of adjacent blocks, and creates interpolation data. The block integration unit 126 integrates every four divided blocks based on the interpolation data obtained by the interpolation data creation unit 125 to form a new block. The data output unit 127 outputs subdivided elevation data based on the new one block integrated by the block integration unit 126. The altitude data drawing unit 14 draws altitude data on the display unit 15 for each block output from the data output unit 127.
[0025]
It should be noted that the display screen correspondence table 13 is configured as a table in which the block size, which is the minimum unit of elevation data, and the resolution of the display screen are associated with each other, and by referring to this table, one block, which is the minimum unit of elevation data, The configuration is such that the block division determination unit 122 can determine whether the size is not coarse with respect to the resolution of the display screen.
[0026]
Next, the operation of creating and subdividing the interpolation data of the block of the input elevation data in the present embodiment will be described with reference to the flowchart of FIG. 3 and the explanatory diagrams of FIGS.
[0027]
When the program shown in FIG. 3 starts, first, altitude data is fetched from the altitude data storage unit 11 by the data input unit 121 (step S1). Here, the input altitude data is composed of nine blocks 41 as shown in FIG. The numerical value in the block 41 indicates the altitude value.
[0028]
Next, the block division determining unit 122 determines whether or not the size of one block, which is the minimum unit of the input altitude data, is not coarse with respect to the resolution of the display screen with reference to the display screen correspondence table 13 (step). S2). Here, when it is determined that the block division is not necessary, the process proceeds to step S6, and when it is determined that the block division is necessary, the process proceeds to step S3.
[0029]
If the block division determining unit 122 determines that the size of one block, which is the minimum unit of the elevation data, is coarse with respect to the resolution of the display screen, it outputs a division determination command to the block division instructing unit 123, and The block division instruction unit 123 outputs a block division instruction to the block division unit 124. Upon receiving the division instruction, the block division section 124 divides each of the nine blocks 41 into 16 equal parts as shown in FIG. 5 (step S3). The numerical value in each block divided into 16 represents the altitude value.
[0030]
Next, based on the divided blocks divided by the block dividing unit 124, the largest altitude existing in the center block of the original 9 blocks among the divided blocks divided into 16 equal parts by the interpolation data creating unit 125. An average value of elevation values for creating interpolation data is obtained for each of the four blocks including the divided blocks adjacent to the outer periphery of the value (step S4). FIG. 6 shows a calculation result of the average of the altitude values for every four blocks. Next, a new block 51 is created by integrating every four blocks by the block integration unit 126 using the interpolation data created by the interpolation data creation unit 125 (step S5). FIG. 7 shows a new block 51. As for the block size of the new block 51, nine blocks before division are each a quarter divided block, and have a size corresponding to the resolution of the display screen.
[0031]
The block integrated by the block integration unit 126 every four equals is output as a new block 51 by the elevation data output unit 127 (step S6). In the altitude data output unit 127, the altitude data drawing unit 14 processes the drawing data based on the output altitude data, and draws the drawing data on the display screen of the display unit 15 (step S7).
[0032]
According to this embodiment, when it is determined that the size of one block, which is the minimum unit of the input elevation data, is coarse with respect to the resolution of the display screen, each block 41 is divided into 16 equal parts. Further, based on the divided blocks, the interpolation data creation unit 125 calculates the average of the elevation values for every four blocks including the adjacent blocks, and adjusts the input elevation data to the resolution of the display screen. With this configuration, the block size of the altitude data can be reduced in accordance with the display screen resolution, whereby the altitude data can be displayed on the display device without looking like a mosaic.
[0033]
Further, since the interpolation data created by the interpolation data creation unit 25 is integrated every four blocks by the block integration unit 126, a new block 51 shown in FIG. 7 is created (step S5). The block size at this time is 1/4 before the division, and is a size corresponding to the resolution of the display screen.
[0034]
The block integrated by the block integration unit 126 every four equals is output as a new block 51 by the elevation data output unit 127 (step S6). In the elevation data output unit 127, the elevation data drawing unit 14 processes the output elevation data into drawing data based on the output elevation data, and the drawing on the display screen of the display unit 15 is subdivided by interpolation data. The resolution of the elevation data corresponding to the screen can be reduced, and the data is not displayed in a mosaic form.
In the present invention, altitude data in the data output unit is not converted into a file, but a file may be used.
[0036]
【The invention's effect】
As described above, according to the present invention, by dividing input elevation data by interpolation data, blocks of elevation data can be reduced in accordance with the resolution of the display screen, and displayed in a mosaic form. This has the effect of providing a drawing processing device and a recording medium on which a drawing processing program is recorded.
[Brief description of the drawings]
FIG. 1 is a functional block diagram showing an example of an altitude data drawing processing device according to the present invention. FIG. 2 is a configuration diagram showing a computer constituting the altitude data drawing processing device of FIG. 1. FIG. FIG. 4 is a flowchart showing the operation of the apparatus. FIG. 4 is an explanatory diagram of the elevation data drawing process in the present embodiment. FIG. 5 is an explanatory diagram of the elevation data drawing process in the present embodiment. FIG. 6 is an elevation data drawing in the present embodiment. FIG. 7 is an illustration of processing. FIG. 7 is an illustration of elevation data drawing processing in the present embodiment.
1 microcomputer 2 CPU
3 input means 4 internal storage means 5 external storage means 5A recording medium 6 CRT (display means)
11 Elevation data storage unit 12 Elevation data subdivision unit 13 Display screen correspondence table 14 Elevation data drawing unit 121 Data input unit 122 Block division unit 123 Block division instruction unit 124 Block division unit 125 Interpolation data creation unit 126 Block integration unit 127 Data output Department

Claims (8)

An altitude data drawing processing device for displaying altitude data on display means,
Storage means for storing elevation data;
Data input means for capturing elevation data from the storage means,
Block division determination means for determining whether the block size, which is the minimum unit of the elevation data input from the data input means, is coarse with respect to the resolution of the display screen of the display means,
When the block division determination means determines that the one block size, which is the minimum unit of the elevation data, is coarse with respect to the resolution of the display screen, the block is divided and interpolation data of the elevation data is created to subdivide the elevation data. Data creation means,
Drawing means for drawing based on the elevation data subdivided by the interpolation data creating means,
An altitude data drawing processing device comprising: A display screen correspondence table configured in a table in which the block size and the resolution of the display screen are associated with each other, and the block size is determined by the block division determining unit with reference to the display screen correspondence table so that the block size is determined with respect to the resolution of the display screen. 2. The altitude data drawing processing device according to claim 1, wherein it is determined whether or not it is rough. When the block division determination unit determines that the block size is coarse with respect to the resolution of the display screen, the block division unit further divides each block of the original elevation data into a plurality of equal parts. Interpolation data is created for the block size of the original elevation data by calculating the average of the elevation values between the four blocks adjacent to the divided block, and the blocks of the elevation data are subdivided. The altitude data drawing processing device according to claim 1 or 2, wherein: When the block division determination unit determines that the block size is coarse with respect to the resolution of the display screen, the block division unit divides each block of the original elevation data into a plurality of equal parts, and the block division unit A block in which an average value of elevation values between the blocks is calculated for every four blocks adjacent to the divided block by interpolation data generating means, and a plurality of the four blocks whose average values are calculated are integrated to form a new block. 3. The altitude data drawing processing device according to claim 1, further comprising an integrating unit. A recording medium recording an elevation data drawing processing program for displaying elevation data on a display means,
A data input step for capturing elevation data,
A determination step of determining whether the block size, which is the minimum unit of the input elevation data, is coarse with respect to the resolution of the display screen of the display unit,
Subdividing the elevation data by dividing the block and creating interpolation data of the elevation data when the block size is determined to be coarse with respect to the resolution of the display screen in the determination step,
A drawing step of drawing based on the subdivided elevation data,
Recording medium for storing a drawing processing program for causing a computer to execute the program. In the determining step, a reference is made to a display screen correspondence table configured in a table in which the block size and the resolution of the display screen are associated with each other, and it is determined whether the block size is not coarse with respect to the resolution of the display screen. 6. The recording medium according to claim 5, wherein a drawing processing program for causing a computer to make a determination is recorded. When it is determined in the determination step that the block size is coarse with respect to the resolution of the display screen, each block of the original elevation data is divided into a plurality of equal parts, and four blocks adjacent to the divided block are divided. 7. A program according to claim 5 or 6, wherein a program for interpolating the block size of the original elevation data by generating an average value of the elevation values between the blocks for each block and subdividing the blocks of the elevation data is recorded. recoding media. In the determination step, when it is determined that the block size is coarse with respect to the resolution of the display screen, each block which is the minimum unit of the elevation data is divided into a plurality of equal parts, and the divided block is adjacent to the divided block. 7. The recording medium according to claim 5, wherein a program for calculating an average value of the elevation values between the blocks for each four blocks and creating a new block by integrating a plurality of the four blocks for which the average values have been calculated is recorded.

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