JP2002366027A - Method for setting longitude scale for map of different longitude interval and method for specifying known longitude/latitude coordinate on map and device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device in which the difference of the interval of longitude due to the difference of latitude can be adjusted and a detailed value of latitude and longitude can be read on a map and GPS digital data can be specified on a map with a single ruler. SOLUTION: A transparent plate is put a scale mark in the horizontal direction equally divided making the whole length the same as the longest rough longitude interval, and each end of the mark is defined as a base point A and an end point C of a longitude ruler. Meanwhile, the base point A of a latitude ruler with a scale mark in the vertical direction equally dividing the rough latitude interval is placed on the base point A of the longitude scale on a rough longitude line of a map. By rotating the longitude ruler around the base point A and fixing it in the position where the end point C coincides with the rough longitude line of the map, the longitude and latitude of the map area can be read in detail.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reads accurate latitude / longitude information from a map, and accurately specifies digital latitude / longitude position data by GPS on a map to prevent distress, rescue activities, and environment. It relates to fields that support outdoor activities such as surveys.

[0002]

2. Description of the Related Art Coordinate and latitude lines are described on charts and small-scale maps, but the coarse and longitude intervals are too wide. ,
There was only a method of calculating by proportional calculation.

[0003]

The inventor of the present invention has devised a ruler capable of reading detailed longitude and latitude from a map coarse longitude and latitude line, and has proposed utility model registration No. 3055465. However, on a large map that covers a wide area, such as a marine chart, the difference between the coarse and long intervals due to the difference in latitude is too large on the sea that travels over a wide area, requiring a plurality of reading rulers. For example, the 1/2000 nautical chart describes coarse longitude lines at intervals of 20 minutes. Coordinate longitude interval of 18 at latitude 0 degrees north
For 5.5 mm, the coarse longitude interval at 40 degrees north latitude is 14
2.3 mm, a difference of 43.2 mm, and a difference of about 8640 m in terms of distance. Therefore, the error is too large, and a plurality of reading rulers are required for accurate reading. Incidentally, the coarse latitude interval is 184.3mm at 0 ° N and 4N at north latitude.
At 0 degree, there is a difference of 0.7 mm at 185.0 mm, and there is almost no difference. That is, the point to be noted here is that the longitude interval greatly changes with the latitude change, but the latitude interval does not change.

[0004]

Means for solving the above problem will be described with reference to FIGS. In an isosceles triangle ACC ', the relationship between the midpoint M of AC and the midpoint M' of AC 'is A
The proportional expression of C: AM = AC ': AM' holds. Therefore, in FIG. 4, AC is set to the longest coarse longitude interval, this interval is set on a longitude scale that is equally divided, and the interval L between the perpendicular X and C ′ descending from A is set as the coarse longitude interval of the map area. It becomes a detailed longitude reading ruler for the map area. The case of reading the detailed longitude value of an arbitrary point P on the map using this ruler will be described with reference to FIG. First, the ruler base point A is set to P on the map.
Overlap the point and keep the ruler parallel to the map. At this time, the intersection Q between the map coarse longitude line and the longitude scale is a detailed longitude value, so count the scale from A to the intersection Q and calculate the coarse longitude value. By adding the read numerical value, a detailed longitude value is obtained.

Further, when digital longitude position information from the GPS is obtained on a map, the detailed longitude position information from the GPS is marked on a longitude scale, and the mark is aligned with the coarse longitude line on the map. Then, the ruler base point A becomes the desired longitude position and can be easily specified.

DETAILED DESCRIPTION OF THE INVENTION

Applying the longitude reading of the present invention to a map,
The form will be described specifically with the following map. In FIG. 1, two lines perpendicular to the transparent plate are inserted, and a latitude scale that is equal to the coarse latitude interval and is equally divided into AB, which corresponds to the map scale from the intersection A to the vertical X-axis, and I do. On the horizontal line Y axis, AC is equally divided into longitude scales having the same width as the map coarse longitude interval. Next, when the longitude scale is rotated by θ around A, and the distance L from the point C to the X axis is fixed at the same width as the coarse longitude interval of the map area, the longitude scale corresponding to the map area is obtained. become.

Using this ruler, any point on the map, P
FIG. 5 illustrates a case where the detailed longitude value is read. Ruler A is superimposed on point P on the map and kept parallel to the map. At this time, the intersection Q between the map coarse longitude line and the longitude scale becomes a detailed longitude value, so the scale from A to Q is 42 seconds. Is counted, and added to the coarse longitude value of 140 degrees 15 minutes, a detailed longitude value of 140 degrees 15 minutes 42 seconds can be read.

[0008] To read the detailed latitude value, the intersection of the ruler latitude scale 27 seconds is read from the map coarse latitude line 36 degrees 20 minutes and A, and by adding, the detailed latitude value of 36 degrees 20 minutes 27 seconds is read. Can be done.

The case of processing with one ruler will be described with reference to FIG. As in the ruler according to claim 5, a coarse / longitudinal interval L associated with a change in latitude is calculated in advance, a circle is drawn with a radius AC around A, and an intersection between the circle and the coarse / longitude width L associated with the change in latitude is defined as a latitude. Simply take a point, connect lines radially from A, and mark each line with equally spaced graduations. When the longitude and latitude are read from the map or when the GPS digital position information is specified on the map, the intersection of the longitude scale and the map coarse longitude line, which is the same as the latitude of the map, is read.

When the latitude scale and the longitude scale of claim 3 are used with separate rulers, the scale is rotated at the base point A, and the latitude ruler is aligned with the coarse latitude line at the middle position of the map latitude and temporarily fixed. Then, by rotating the longitude ruler and fixing the two rulers at the position where the point C matches the map coarse longitude line, a longitude / latitude ruler suitable for the map area is obtained.

[0011] To fix the two rulers, a longitude ruler coated with a weak adhesive or a screw fixing device, or a latitude ruler and a translucent ruler sandwiched by a transparent sheet, and a small amount of water or oil There is also a device to fix by.

If the base point A is formed by making a small hole in the ruler or positioned along the edge of the latitude ruler, it is convenient to mark the map with a pen when specifying the position on the map.

[Effects of the present invention]

As described above, the present invention has a great effect in a very simple manner. On a small-scale map that displays vast areas such as nautical nautical charts, environmental survey maps, and weather survey maps on a single map, latitude values can be read because coarse-longitude line intervals due to latitude differences are significantly different. Also could not read the longitude value. All the detailed latitude and longitude values can be read with a single ruler, and the digital latitude and longitude position information can be easily specified on the map, thereby further increasing the value of the map.

The reading method is a reverse reading method in which the scale is counted by replacing the coarse / latitude value intersecting the reference point with the longitude value to the left and the latitude value to the lower direction. Becomes the same detailed value. In other words, mistakes due to addition can be prevented.

[0015] Since May 2000, the GPS has become highly accurate, and the position information of 3m to 10m can always be obtained instantaneously. Also, portable GPS has become cheaper and more popular, and is becoming an indispensable tool for outdoor activities. However, with digital information, the location of which could not be reflected on the map location can be easily identified by using this ruler, which is very useful for distress prevention, rescue activities, environmental surveys, etc. .

If the map scale and the coarse longitude / latitude interval are the same,
In addition to being able to handle all maps, even if the scale is different, if the coarse longitude width of the ruler and the coarse longitude / latitude interval of the map are the same, the scale values can be read and used, and one ruler can be used for many maps. It can help reduce costs.

[Brief description of the drawings]

FIG. 1 shows the structure of the present invention.

FIG. 2 is a sketch showing a method of reading detailed longitude and latitude from a map.

FIG. 3 shows the principle

FIG. 4 shows the principle

FIG. 5 is a sketch drawing showing specific detailed longitude readings.

FIG. 6 is a ruler for processing latitude and longitude on one plate.

[Explanation of symbols]

 1 Ruler 2 Young coarse latitude line 3 Old coarse latitude line 4 Young coarse longitude line 5 Old coarse longitude line A Ruler base point B Ruler coarse latitude width end point C Ruler coarse longitude width end point , M 'Intermediate point of ruler L Distance from end point of ruler ancestral width to ruler coarse latitude line P Any point on map Q Intersection of longitude ruler scale and coarse longitude line R Intersection of latitude ruler scale and coarse latitude line X Latitude line Y Longitude line θ Angle between coarse longitude line and longitude ruler

Claims (5)

[Claims] In the horizontal direction of a transparent plate, the same width as the longest coarse / longitudinal interval is graduated in equal divisions and used as a longitude ruler. With the scale base point aligned with the old coarse longitude line of the map area, the ruler scale end point is matched with the young coarse longitude line, and at this time, the angle made by the ruler and the coarse longitude line is maintained, and only the longitude of the map area is used. Longitude scale setting method characterized by setting the scale. 2. The method according to claim 1, wherein, with the scale set, a scale base point is superimposed on an arbitrary point on the map, and the ruler is made parallel to the coarse longitude line. In this state, the scale from the base point to the intersection of the map coarse longitude line and the ruler scale is counted in the opposite direction, and in addition to the intersecting coarse longitude values, the longitude of any point on the map is read. The detailed longitude reading method. 3. One of the two scale rulers rotating at the scale base point is defined as the longitude rule of claim 1, and the other is equally divided into the same width as the coarse latitude interval below the scale base point. A longitude and latitude ruler that can be rotated around a base point, fixed at a target position, and read latitude and longitude values simultaneously. 4. When the known detailed longitude / latitude value is specified on a map, a known longitude detailed value and a latitude detailed value are marked on the ruler of claim 3. Next, when the ruler mark is superimposed on the map coarse longitude line, the position on the map is specified by the ruler base point. 5. Two lines perpendicular to the base point are drawn on the transparent plate, and a longitude scale is set in the lateral direction from the base point with a longest coarse / longitudinal interval. Occasionally, a latitude scale with coarse latitude intervals below the base point is used. Next, draw a circle centered on the base point with the coarse longitude scale width as the radius, and calculate in advance the regional coarse longitude intervals due to the difference in latitude, and calculate the coarse longitude width for each area using the ruler latitude line. To find the intersection with the circle,
Mark. Connect these marks and the base point in a fan shape,
A longitude / latitude ruler that displays latitude values and attaches a detailed scale of longitude counted from the base point to all lines.