JPH11167646A - Method and device for processing altitude data plotting and recording medium storing altitude data plortting processing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display altitude data that is not seen in a mosaic shape by subdividing the altitude data in accordance with the resolution of a display screen. SOLUTION: A data inputting part 121 fetches altitude data from an altitude data storing means 11 and a block division deciding part 122 decides whether or not the size of one block that is a minimum unit of the altitude data is rough to the resolution of a display screen by referring to a display screen correspondence table 13. When the part 122 decides that it is rough, a block division indicating part 123 instructs a block dividing part 124 and the part 124 equally divides the original block of the altitude data into sixteen. An interpolation data creating part 125 calculates the mean value of altitude values of every four blocks including adjacent blocks based on the divided division block and a block integrating part 126 integrates every four blocks to produces a new block. An altitude data plotting part 14 performs plotting processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process for drawing altitude data to be displayed on a screen of a display device, by interpolating data based on the altitude data to be used, so that the visibility is improved even at a detailed scale level. The present invention relates to an elevation data drawing method and apparatus for improving the image quality, and a recording medium storing an elevation data drawing program.

[0002]

2. Description of the Related 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 digital altitude data, The method of automatically creating a water system diagram by superimposing the obtained flow paths, or as shown in JP-A-9-147086,
2. Description of the Related Art There is known a method in which a slope angle between a stratum surface and a horizontal plane is calculated from elevation data having elevation information of a terrain in a grid form, and a slope of the elevation data is automatically estimated.

[0003]

However, when such altitude data is displayed on a graphic display using a CRT, the rectangle which is the minimum unit of the altitude data depends on the scale of the altitude data to be displayed and the resolution of the display screen. If they are different, at the more detailed scale level, the rectangle that is 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. There's a problem.

The present invention solves such a conventional problem, and makes it possible to display altitude data that does not look like a mosaic by subdividing altitude data according to the resolution of a display screen. An object of the present invention is to provide an altitude data drawing processing method and apparatus, and a recording medium on which an altitude data drawing processing program is recorded.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method of drawing altitude data for displaying altitude data on a display means, comprising the steps of: A determining step of determining whether a block size, which is the minimum unit of the elevation data, is coarse with respect to the resolution of the display screen of the display means; and, in the determining step, one block size, which is the minimum unit of the elevation data, is used for the display screen. It is provided with a step of subdividing the elevation data by creating interpolation data of the elevation data when it is determined that the resolution is coarse, and a drawing step of plotting the subdivided elevation data.

According to the present invention, display of elevation data that does not look like a mosaic can be realized by subdividing the elevation data.

The present invention relates to an altitude data drawing processing apparatus for displaying altitude data on a display means, a storage means for storing altitude data, a data input means for taking in altitude data from the storage means, and a data input means. Means for 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 means, and 1 which is the minimum unit of the elevation data in the block division determination means. Interpolation data creation means for creating interpolation data of elevation data when it is determined that the block size is coarse with respect to the resolution of the display screen and subdividing the elevation data, and drawing means for rendering the subdivided elevation data Is what you do.

According to the present invention, display of elevation data that does not look like a mosaic can be realized by subdividing the elevation data.

According to the present invention, there is provided a recording medium storing an elevation data drawing 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 provided. A determination step of determining whether or not the resolution of the display screen of the display means is coarse; and determining that one block size, which is the minimum unit of the elevation data, is coarse relative to the resolution of the display screen in the determination step. A drawing program for causing a computer to execute a step of subdividing the elevation data by creating interpolation data of the data and a step of plotting the subdivided elevation data in the computer.

According to the present invention, display of elevation data that does not look like a mosaic can be realized by subdividing the elevation data.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a method for processing elevation data for displaying elevation data on a display means, comprising: a data inputting step for inputting elevation data; A determining step of determining whether a block size, which is a minimum unit of data, is coarse with respect to a resolution of a display screen of the display means; and, in the determining step, one block size, which is a minimum unit of altitude data, is a resolution of the display screen. A step of subdividing the elevation data by creating interpolation data of the elevation data when it is determined that the elevation data is rough, and a drawing step of rendering the subdivided elevation data. By doing so, there is an effect that display of elevation data that does not look like a mosaic can be realized.

The invention according to claim 2 has a display screen correspondence table in which a table is formed by associating a block size, which is a minimum unit of elevation data, with a resolution of a display screen, and refers to the display screen correspondence table. To determine whether the one block size, which is the minimum unit of altitude data, is not coarse with respect to the resolution of the display screen. Thus, it is possible to easily determine the necessity of segmenting data.

According to a third aspect of the present invention, when it is determined in the determining step that one block size, which is the minimum unit of the elevation data, 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. Interpolation data is created for the block size of the original elevation data by calculating the average of the elevation values between the blocks for each of the four blocks adjacent to the divided block, and Blocks are subdivided, and an effect is obtained that sub-blocks can be subdivided into １ ／ by creating interpolation data with respect to the original block size.

According to a fourth aspect of the present invention, when it is determined in the determining step that one block size, which is the minimum unit of the elevation data, is coarse with respect to the resolution of the display screen, a plurality of blocks each being the minimum unit of the elevation data are determined. A new block is created by calculating the average value of the elevation values between the four divided blocks adjacent to the divided block, and integrating a plurality of the four averaged values. This has the effect of displaying altitude data that does not look like a mosaic when displaying altitude data.

According to a fifth aspect of the present invention, there is provided an altitude data drawing processing apparatus for displaying altitude data on display means,
Storage means for storing the elevation data, data input means for taking the elevation data from the storage means, and 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 means Block division determining means for determining whether or not one block size, which is the minimum unit of elevation data, is coarse with respect to the resolution of the display screen; It comprises interpolation data creating means for subdividing data and drawing means for drawing the subdivided elevation data. By subdividing the elevation data, display of elevation data that does not look like a mosaic is realized. Has the effect of being able to.

The invention according to claim 6 has a display screen correspondence table in which a table is formed by associating a block size, which is a minimum unit of elevation data, with a resolution of a display screen, and refers to this display screen correspondence table. The block division determining means determines whether or not one block size, which is the minimum unit of the elevation data, is not coarse with respect to the resolution of the display screen. The setting has an effect that the necessity of data segmentation can be easily determined.

According to a seventh aspect of the present invention, each block of the original altitude data is divided into a plurality of blocks when the block division judging means judges that one block size as the minimum unit of the altitude data is coarse with respect to the resolution of the display screen. A block size of the original elevation data by obtaining an average value of elevation values between every four blocks adjacent to the divided block divided by the block division means. The interpolation data is created with respect to and the block of the elevation data is subdivided. By creating the interpolation data with respect to the original block size, 1 /
4 can be subdivided into four block sizes.

According to the present invention, each block of the original elevation data is divided into a plurality of blocks when the block division judging means judges that one block size, which is the minimum unit of the elevation data, is coarse with respect to the resolution of the display screen. A block dividing unit that divides the data into blocks, an average value of elevation values between the blocks divided by the block dividing unit, obtained for every four blocks by interpolation data creating unit, and And a block integration means for creating a new block by integrating a plurality of the four blocks obtained as above, and has an effect that the elevation data can be displayed without the appearance of a mosaic when the elevation data is displayed. .

According to a ninth aspect of the present invention, there is provided a recording medium recording an elevation data drawing program for displaying the elevation data on a display means, wherein a data input step of acquiring the elevation data, A determining step of determining whether a block size as a unit is coarse with respect to a resolution of a display screen of the display unit; and, in the determining step, a block size as a minimum unit of altitude data is coarse with respect to a resolution of the display screen. Recording a drawing program for executing, on a computer, a step of subdividing the elevation data by creating interpolation data of the elevation data when the determination is made, and a drawing step of drawing the subdivided elevation data. , It is possible to display elevation data that does not look like a mosaic by subdividing the elevation data It has the effect of say.

The invention according to claim 10 has a display screen correspondence table in which a table is formed by associating a block size, which is a minimum unit of elevation data, with a resolution of a display screen. And a program that determines whether the minimum block size of elevation data is not coarse with respect to the resolution of the display screen, and sets in advance in the table the criteria for whether or not it looks like a mosaic By doing so, the necessity of data segmentation can be easily determined.

According to an eleventh aspect of the present invention, when it is determined in the determining step that one block size, which is the minimum unit of the elevation data, 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. Interpolation data is created for the block size of the original elevation data by calculating the average of the elevation values between the blocks for each of the four blocks adjacent to the divided block, and It records a program for subdividing a block, and has an effect that subdivision into a quarter block size can be achieved by creating interpolation data for the original block size.

According to a twelfth aspect of the present invention, when it is determined in the determining step that one block size, which is the minimum unit of the elevation data, is coarse with respect to the resolution of the display screen, a plurality of blocks each being the minimum unit of the elevation data are determined. A new block is created by calculating the average value of the elevation values between the four divided blocks adjacent to the divided block, and integrating a plurality of the four averaged values. The program has a function of displaying altitude data that does not look like a mosaic when the altitude data is displayed.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This 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. 6 are explanatory diagrams of the altitude data drawing processing in the present embodiment.

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. I do.

An altitude data drawing processing apparatus according to the embodiment of the present invention is a personal computer 1 shown in FIG.
It consists of. This personal computer 1
Is a CPU 2, an input unit 3 such as a keyboard and a mouse,
An internal storage device 4 such as an M, an external storage device 5 such as a hard disk device, and a display device 6 such as a CRT are provided. The function of each unit shown in FIG. 1, which will be described in detail later, loads predetermined program data required for the elevation data drawing process of the present invention from the external storage device 5 into the internal storage device 4 of the personal computer 1, and executes this program. This is realized by operating the CPU 2 based on the data. The external storage device 5 stores elevation data used in the embodiment of the present invention. Further, the external storage device 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.

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 stores elevation data for input used for drawing processing. Means 11, an altitude data subdividing means 12 for subdividing the altitude data input from the altitude data storage means 11, a display screen correspondence table 13 for determining the necessity of subdividing the size of one block, and an altitude data It is composed of an elevation data drawing unit 14 for drawing altitude data created by the subdivision unit 12 and a display unit 15 for displaying the altitude information that has been drawn.

The input elevation data stored in the elevation data storage means 11 includes a representative point in a rectangular unit as elevation data to be used.

The elevation data subdivision means 12 includes a data input section 121, a block division determination section 122, a block division instructing section 123, a block division section 124, an interpolation data creation section 125, a block integration section 126, and a data output section 127.
Consists of

The data input section 121 is configured to read and input input elevation data necessary for drawing from the elevation data storage means 11. 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 division unit 124 is a block division instructing unit 1
The block is divided into 16 equal parts by the block division instruction from 23.

The interpolation data generator 125 obtains an average value of the divided blocks divided by the block divider 124 for each of the four divided blocks in consideration of adjacent blocks, and generates 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. Data output unit 12
Reference numeral 7 outputs subdivided elevation data based on a new block integrated by the block integration unit 126. The altitude data drawing unit 14 draws the altitude data on the display unit 15 in block units output from the data output unit 12.

The display screen correspondence table 13 is configured as a table in which the block size, which is the minimum unit of the elevation data, and the resolution of the display screen are associated with each other, and by referring to this table, the minimum unit of the elevation data is obtained. The configuration is such that the block division determining unit 122 can determine whether or not a certain block size is not coarse with respect to the resolution of the display screen.

Next, the operation of generating 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.

When the program shown in FIG. 3 starts,
First, the essential data storage unit 1 is input by the data input unit 121.
Elevation data is taken in from step 1 (step S1). Here, the input altitude data is composed of nine blocks 41 as shown in FIG. Numerical values in the block 41 indicate altitude values.

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.

When 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. The block division instructing unit 123 outputs a block division instruction to the block dividing unit 124. Upon receiving the division instruction, the block division unit 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.

Next, based on the divided blocks divided by the block dividing section 124, the interpolation data creating section 125 calculates an average of the elevation values for every four blocks including adjacent blocks (step S4). FIG. 6 shows a calculation result of the average value of the altitude values for every four blocks. Next, by the interpolating data created by the interpolating data creating unit 125, the block integrating unit 126 integrates every four blocks,
A new block 51 is created (Step S5). FIG.
Indicates a new block 51. At this time, the block size is 1/4 of the size before the division, and is a size corresponding to the resolution of the display screen.

The block integrated by the block integration unit 126 at every four equal intervals is output as a new block 51 by the altitude data output unit 127 (step S6). In the altitude data output unit 127, the altitude data drawing unit 14 processes the output altitude data into drawing data based on the output altitude data.
(Step S7).

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 or the like. Based on the divided blocks, the interpolation data creation unit 125 calculates the average of the elevation values for each of the four blocks including the adjacent blocks, and displays the input elevation data on the display screen. Since it is configured to be subdivided according to the resolution, it is possible to reduce the block size of the altitude data corresponding to the display screen resolution, thereby displaying the altitude data on the display device without looking like a mosaic Can be.

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 is created (step S5). FIG. 7 shows a new block 51. The block size at this time is 1 /
4, which is a size corresponding to the resolution of the display screen.

The block integrated by the block integrating unit 126 every four equals is output as a new block 51 by the altitude data output unit 127 (step S6). In the altitude data output unit 127, the altitude data drawing unit 14 processes the output altitude data into drawing data based on the output altitude data.
The resolution of the elevation data corresponding to the display screen can be reduced by subdividing the drawing on the display screen by the interpolation data, and the image is not displayed in a mosaic shape.

In the present invention, altitude data in the data output unit is not stored in a file, but a file may be used.

[0042]

As described above, according to the present invention, the input elevation data is subdivided by the interpolation data, so that the block of the elevation data can be reduced in accordance with the resolution of the display screen, and the mosaic-like pattern can be obtained. The present invention has the effect of providing a drawing processing method and apparatus which is not displayed on a computer 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. 3 is a flowchart showing the operation of the elevation data drawing processing device of FIG. 1;

FIG. 4 is an explanatory diagram of an altitude data drawing process according to the embodiment.

FIG. 5 is an explanatory diagram of altitude data drawing processing in the present embodiment.

FIG. 6 is an explanatory diagram of an altitude data drawing process according to the embodiment;

FIG. 7 is an explanatory diagram of an altitude data drawing process according to the embodiment.

[Description of Signs] 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 means 12 elevation data subdivision means 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 unit

 ────────────────────────────────────────────────── ─── Continuing from the front page (54) [Title of the Invention] Elevation data drawing processing method and apparatus, recording medium elevation data drawing processing method and apparatus recording elevation data drawing processing program, and elevation data drawing processing program Recorded recording medium

Claims (12)

[Claims] 1. An altitude data drawing method for displaying altitude data on a display means, comprising: a data inputting step of inputting altitude data; and a block size as a minimum unit of the input altitude data being displayed on the display means. A determination step of determining whether or not the screen resolution is coarse; and creating interpolation data of the elevation data when it is determined in the determination step that one block size, which is the minimum unit of the elevation data, is coarse with respect to the resolution of the display screen. A step of subdividing the altitude data by performing the subroutine, and a step of plotting the subdivided altitude data. 2. A display screen correspondence table comprising a table in which a block size, which is a minimum unit of elevation data, and a display screen resolution are associated with each other. The minimum unit of elevation data is referred to by referring to the display screen correspondence table. 2. The elevation data drawing method according to claim 1, wherein it is determined whether the one block size is not coarse with respect to the resolution of the display screen. 3. When the determination step determines that one block size, which is the minimum unit of the elevation data, 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. Interpolation data is created for the block size of the original elevation data by calculating the average value of the elevation values between the four blocks adjacent to the divided block to subdivide the block of the elevation data. The elevation data drawing method according to claim 1 or 2, wherein: 4. When the determination step determines that one block size, which is the minimum unit of the elevation data, 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. An average value of elevation values between four blocks adjacent to the divided block obtained is obtained, and a new block is created by integrating a plurality of the four blocks whose average values have been obtained. Item 3. The elevation data drawing method according to item 1 or 2. 5. 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 taking the altitude data from the storage means, and an input to the data input means. Block division determining means for determining whether or not the block size, which is the minimum unit of the elevation data, is coarse with respect to the resolution of the display screen of the display means, and one block size, which is the minimum unit of the elevation data, in the block division determination means Comprises interpolation data creation means for creating interpolation data of elevation data when it is determined that the resolution is low with respect to the resolution of the display screen and subdividing the elevation data, and drawing means for rendering the subdivided elevation data. An altitude data drawing processing device characterized by the above-mentioned. 6. A display screen correspondence table in which a block size, which is a minimum unit of altitude data, and a resolution of a display screen are associated with each other, and a block division determination unit refers to the display screen correspondence table and refers to the display screen correspondence table. 6. The altitude data drawing apparatus according to claim 5, wherein it is determined whether or not one block size, which is the minimum unit of the altitude data, is not coarse with respect to the resolution of the display screen. 7. A block dividing means for dividing each block of the original altitude data into a plurality of equal parts when the block division judging means judges that one block size as a minimum unit of the altitude data is coarse with respect to the resolution of the display screen. Generating interpolation data for the block size of the original elevation data by calculating the average value of the elevation values between the four blocks adjacent to the divided block divided by the block dividing means. 7. The altitude data drawing apparatus according to claim 5, wherein the altitude data block is subdivided. 8. A block dividing means for dividing each block of the original altitude data into a plurality of equal parts when the block division judging means judges that one block size as the minimum unit of the altitude data is coarse with respect to the resolution of the display screen. And calculating an average value of elevation values between the blocks for each of the four blocks adjacent to the divided block divided by the block dividing means by the interpolation data generating means. 7. The altitude data drawing processing apparatus according to claim 5, further comprising a block integration unit that creates a new block by integrating. 9. A recording medium recording a drawing program of elevation data for displaying elevation data on a display means, wherein a data input step of taking in elevation data, and a block size as a minimum unit of the inputted elevation data is set to A determination step of determining whether or not the resolution of the display screen of the display means is coarse; and determining that one block size, which is the minimum unit of the elevation data, is coarse with respect to the resolution of the display screen in the determination step. A recording medium storing a drawing program for causing a computer to execute: a step of subdividing elevation data by creating interpolation data; and a drawing step of plotting the subdivided elevation data. 10. A display screen correspondence table in which a block size as a minimum unit of the elevation data and a resolution of the display screen are associated with each other, and the minimum unit of the elevation data is referred to by referring to the display screen correspondence table. 10. The recording medium according to claim 9, wherein a program for determining whether or not one block size is not coarse with respect to the resolution of the display screen is recorded. 11. In the determination step, when it is determined that one block size, which is the minimum unit of the elevation data, 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. A program for generating interpolation data 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 subdividing the blocks of the elevation data The recording medium according to claim 9, wherein the recording medium is recorded. 12. When each block, which is the minimum unit of elevation data, is determined to be coarse with respect to the resolution of the display screen in the determination step, each block, which is the minimum unit of elevation data, is divided into a plurality of equal parts. A program for calculating an average value of elevation values between four adjacent blocks with respect to the divided block obtained, and creating a new block by integrating a plurality of the four blocks whose average values have been determined. 11. The recording medium according to 9 or 10.