KR20140062820A - Isiand coastline mapping method with aerial photograph - Google Patents

Abstract

A method of making an island's coastline using aerial photographs is disclosed. A method of making a coastline of an island using an aerial photograph of the present invention is a method for producing an island coastline, comprising the steps of: a) taking an aerial photograph or a photographed aerial photograph of an island to be shoreline; Selecting photographic location points that are distinguishable around an island including a protruding portion of the island; b) obtaining positional data for the scene position points of the islands corresponding to the photo position points selected in the step a), using the ZPS; c) performing an offset correction operation using a computer to input positional data of the site location points obtained in the step b) in correspondence with the photo location points of the aerial photograph; And d) digitizing the position data of each of the position points in the aerial photograph in which the position data is input through the step c), and converting the value of the digitized position data into x and y coordinates to generate a shoreline The method comprising the steps of: According to the present invention, it is possible to generate an accurate coastline by using the aerial photograph and the position data acquired by the GPS with respect to a plurality of position points in the field, without incurring high costs and effort on the island, Effect can be provided.

Description

{ISIAND COASTLINE MAPPING METHOD WITH AERIAL PHOTOGRAPH}

The present invention relates to a method of making an island coastline using aerial photographs, and more particularly, to an aerial photograph capable of accurately producing coastlines of an island whose location and shape are not accurate by using aerial photographs and site location data at low cost And the method of making the coastline of the used island.

In the case of land, the map is made by measuring the position of the coastline through various methods. However, in the case of uninhabited island (island) where people do not live, accessibility is difficult and it is almost impossible to survey because of the near cliff topography.

In the case of unmanned books, maps were created using only aerial photographs in the past.

As a result, the coastline and outline of the island were unclear as shown in the chart of Fig.

In recent years, it is possible to measure the coastline of this area through precision airborne laser surveying. However, unmanned books have not been surveyed due to cost problems because their importance is lower than the area where people live.

The precision aerial photographs provided by the portal site have resolution enough to confirm the shape of the island, but do not have accurate location information.

There are various ways of making maps using aerial photographs.

For example, there is a method of updating a GIS digital map of surveying information of roadside facilities using a GPS receiver and a laser instrument equipped vehicle and an aerial photograph disclosed in Korean Patent No. 10-0581235 (public notice: 2006.05.22) 10-1079359 (Notice: 2011.11.02) This is a digital map construction system using aerial photographs and aerial laser survey data.

These prior arts, however, are technologies for producing maps using aerial photographs and already provided digital maps. For example, it is not easy to access unmanned books, It was difficult technologies.

Korean Patent No. 10-0581235 (Notification Date: May 22, 2006) Korean Patent No. 10-1079359 (public announcement date: 201.11.02)

It is an object of the present invention to provide a means for constructing accurate coastlines at low cost by using aerial photographs and GPS location information on the islands for islands unknown in exact form and location.

This object is achieved according to the invention by a method for producing a coastline of an island comprising the steps of a) aerial photographing or photographing of a photograph of an island for which a coastline is to be made, Selecting photographic location points that can be distinguished around the island, including; b) obtaining positional data for the scene position points of the islands corresponding to the photo position points selected in the step a), using the ZPS; c) performing an offset correction operation using a computer to input positional data of the spot position points obtained in the step b) in correspondence with the photo position points of the aerial photograph; And d) digitizing the position data of each of the position points in the aerial photograph in which the position data is input through the step c), and converting the value of the digitized position data into x and y coordinates to generate a shoreline Wherein the method comprises the steps of:

The step b) is a step of measuring the position data by approaching the site position points of the island using a ship equipped with the above-mentioned fiber or an aquatic motorcycle.

The step b) may further include the step of measuring the outline of the island by using the web and the posture measuring device while moving the island around the small boat, boat or watercraft equipped with the web.

The step b) may be performed by mounting a posture measuring device, a single-beam echo sounder or a multi-beam echo sounder on a small-sized ship, a boat, or a watercraft equipped with the above- And measuring the water depth.

According to the present invention, it is possible to generate an accurate coastline by using the aerial photograph and the position data acquired by the GPS with respect to a plurality of position points in the field, without incurring expensive costs and effort on the island, This provides a useful effect as a basic data for management of uninhabited islands (islands) which have important meaning as a territory even though the survey is not performed properly.

In addition, more accurate coastlines can be extracted by correcting the shape of the island by measuring the outline of the island by using a fiber-optic or acoustic echo sounder, and when measuring the depth of water around the island using an acoustic echo canceller, It is possible to provide an effect of creating a water depth.

1 is a diagram showing charts according to the prior art.
Fig. 2 is an image in which a photograph position point is displayed on an aerial photograph to be used in a method of producing an island shoreline according to the present invention.
3 is an image showing a state in which a peripheral outline of the island shown in FIG. 2 is measured.
4 is an image showing a state in which position data is combined with the aerial photograph shown in Fig.
5 is an image of a coast line of an island generated according to the present invention and a coast line of an existing sea chart.
FIG. 6 is a block diagram illustrating a method of manufacturing a coastline of an island according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the well-known functions or constructions are not described in order to simplify the gist of the present invention.

FIG. 2 is an image showing an image position point on an aerial photograph to be used in a method of producing an island shoreline according to the present invention, FIG. 3 is an image showing a state in which a peripheral outline of the island shown in FIG. 2 is measured And Fig. 4 is an image showing a state in which the position data is combined with the aerial photograph shown in Fig. FIG. 5 is an image of a coastline of an island generated according to the present invention and a coastline of an existing sea chart, and FIG. 6 is a block diagram for explaining a coastline of an island according to the present invention.

A method of constructing a coastline of an island using an aerial photograph according to the present invention will be described with reference to the accompanying drawings.

First, in order to make the coastline of the island, an aerial photograph or an aerial photograph 10 is taken of a photograph of an island to which the coastline is to be manufactured. Then, in the acquired aerial photograph 10, the photographic location points 12 that can be distinguished around the island including the protruding portion of the island are selected. That is, on the basis of the aerial photograph 10, a plurality of places such as a protruding part, an inclined part, an outward part, a straight part, and a curved part of the island are selected as the photographing point 12.

Subsequently, position data are obtained using the GPS with respect to the scene position points 20 of the islands corresponding to the selected picture position points 12 in the above-described process. To do this, the ship's on-site location points (20) are accessed using a ship equipped with a GPS or an aquatic motorcycle or a small boat. Then, the position data of the corresponding site location points 20 are measured with a GFS.

At this time, a single beam acoustic echo sounder or a multi-beam acoustic echo sounder is installed on a ship, a water motorcycle or a small boat, and a gyroscope and an accelerometer are installed as an attitude measuring device. This is for surveying the position data of the site location points 20 while traveling around the island with a small boat or the like, as well as for the outline survey of the island.

This is because the positional data on the site location points 20 are measured by a ship equipped with a GPS, an aquatic motorcycle, or a small boat, because it is easy to access the site point 20 having a low depth of water.

In this way, the X and Y coordinate values of the site location points 20 are measured with a geofast mounted on a small boat or the like.

On the other hand, it is also possible to simultaneously measure the water depth of the site location point 20 by installing a single beam acoustic echo sounder or a multi-beam acoustic echo sounder in a ship, a watercraft motorcycle, or a small boat. The data on the depth of water can be used as the data for creating the depth data of the corresponding point or the depth of the water around the islands. Thus, a more accurate shoreline can be generated. In other words, if a single-beam echo sounder or a multi-beam echo sounder is installed on a ship equipped with a GPS receiver, a water motorcycle or a small boat, the depth data corresponding to the position data of the site location point 20 can be obtained. In addition, the depth of the island may be measured separately from the site location point 20 and used to produce the above-described depth.

Next, as shown in FIG. 4, a small vessel equipped with a posture measuring device for measuring the roll (ROLL), pitch and heading values of the GAFT and the echo sounder, an aquatic motorcycle or a small boat, Measure the outline (30) of the island while driving around.

At this time, the method of measuring the outline 30 of the island may be various. For example, a movement trajectory of a small boat equipped with a GPS and gyroscope and an accelerometer can be created and measured to the outline 30 of the island.

However, in this embodiment, a method using an acoustic echo canceller is applied for more accurate contour line 30 measurement.

That is, when a small ship, water motorcycle or small boat is used, the outline 30 of the island can be accessed within a few meters (m). In particular, an island made up of vertical cliffs can be accessed within 1 to 2 meters, so that the positional information on the outline 30 of the island can be accurately measured. In addition, when the water depth is measured while the multi-beam acoustic echo sounder is operated around the island, it is possible to measure the water depth up to 70 ° on the characteristic of the multi-beam acoustic echo sounder, and the sensor of the multi- , It is possible to acquire the depth and the position information up to the part where the sea surface and the island meet (the coast line of the island), and this information can be utilized as the outline (30) of the island. Performing such an investigation can improve the accuracy of shoreline extraction rather than measuring several site location points.

Such an outline 30 survey of the islands may be distorted in shape when the coastline is formed by the site location points 20. That is, since the shape of the island may become inaccurate, it is intended to measure the outline 30 of the island and correct the shape of the island with this outline.

Subsequently, an offset correction operation is performed using a computer to input the position data of the scene position points 20 obtained by the above-described process in correspondence with the picture position points 12 of the aerial photograph 10, and inputs them.

In other words, geo-rectification that corrects the distorted aerial photograph 10 and matches the location data to the photo location points 12 to insert the location data of the site location points 20, A navigation program, for example, a global mapper, an ArcView program, or the like.

This process combines the location data for the aerial photograph 10 and the site location points 20 of the island.

At this time, the shape of the island is corrected using the value of the outline 30 around the island obtained by the above-described process.

That is, although it is possible to perform coastline extraction of the island using the aerial photograph at several site location points 20, it is preferable to perform correction using the island outline 30 to improve the accuracy of the correction of the deviation. This is because if the site location points 20 are not evenly distributed around the islands or if the number of site location points 20 is small, the photographs can be corrected differently from the actual terrain in the deviation correction process.

At this time, the outline 30 of the island measured by the above-described process can perform two functions. First, reliability of the corrected aerial photograph can be verified by the site point 20, If the photograph shows a wakeboarding of a small boat in the area visible to the land, it means that it has not been corrected to the actual island shape. Secondly, the extracted depth data and outline data 30 obtained from the outline 30 measurement are inserted into the position data in the correction of the deviation of the aerial photograph as in the case of the field position point 20. Especially, when a multi-beam echo sounder is used, it is possible to extract the position value close to the actual coastline.

This process combines the aerial image 10 with the location data for the scene location point 20 and outline 30 of the island.

Subsequently, the position data of each of the position points is digitized using the digitizing means in the aerial photograph 10 in which the position data is inputted through the above-described process. Programs for such digitization can be CAD (AUTO CAD) or remote navigation programs.

This process is a process of converting the position points on the plane into coefficients so as to be displayed as X and Y coordinate values (Coordinates) using a digitizer or a program.

In this process, the value of the digitized position data is converted into X, Y coordinates to create a shoreline.

As described above, the coastline of the island can be produced by using the aerial photograph (10), and the accurate coastline of the island can be produced.

This is accomplished by measuring the location data of the site location points 20 using a geofast on the actual island and combining the inaccurate aerial photograph 10 by measuring the marginal outline of the island.

That is, since the fingertip has an accuracy of several meters (m), it is possible to measure the position data of the island site points 20 by using such a fingertip, and calculate the distorted aerial photograph 10 The position data and the outline line 30 data of the island are combined with the aerial photograph 10 and then the aerial photograph 10 in which the position data and the outline line 30 data are combined is digitized to produce an accurate coastline.

As a result, as shown in FIG. 5, the coast line shown in the existing chart is different from the coast line generated by the coast line manufacturing method according to the present invention. That is, the shoreline produced by the shoreline manufacturing method according to the present invention is more accurate than the shoreline indicated in the existing chart. This is because the shoreline is generated based on the position data directly measuring the site position points of the island and the outline data of the islands using the GPS.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have. Accordingly, it should be understood that such modifications or alterations should not be understood individually from the technical spirit and viewpoint of the present invention, and that modified embodiments fall within the scope of the claims of the present invention.

10: aerial photograph 12: photo position point
20: Field position point 30: Outline

Claims (4)

As a method for constructing an island's coastline,
a) photographing an aerial photograph of an island to be shoreline or obtaining a photographed aerial photograph, and selecting photographic location points distinguishable from the islands including the protruding portion of the island in the aerial photograph;
b) obtaining positional data for the scene position points of the islands corresponding to the photo position points selected in the step a), using the ZPS;
c) performing an offset correction operation using a computer to input positional data of the spot position points obtained in the step b) in correspondence with the photo position points of the aerial photograph; And
d) digitizing the position data of each of the position points in the aerial photograph in which the position data is input through the step c), and converting the value of the digitized position data into x and y coordinates to generate a shoreline ≪ / RTI >
How to make an island coastline using aerial photographs. The method according to claim 1,
The step b)
Characterized in that the position data is measured by approaching the site location points of the island by using a small ship, boat or water motorcycle equipped with the above-mentioned paper-
How to make an island coastline using aerial photographs. 3. The method according to claim 1 or 2,
The step b)
Further comprising the step of measuring the outline of the island by using the web while moving the island around the small boat, boat or watercraft equipped with the web,
How to make an island coastline using aerial photographs. The method of claim 3,
The step b)
Further comprising the step of mounting an attitude measuring device and an acoustic echo sounder on a small ship, boat or water motorcycle equipped with the above-mentioned waterproofing device, and measuring the water depth around the islands using the acoustic echo sounder,
How to make an island coastline using aerial photographs.

Images