CN108171772B

CN108171772B - Method for extracting river boundary by using mapGIS, CJKCOOR _ Ver and DELF3D

Info

Publication number: CN108171772B
Application number: CN201711454297.9A
Authority: CN
Inventors: 刘瑞平; 徐友宁; 焦建刚; 史宇飞; 张江华; 陈华清; 何芳; 柯海玲; 乔冈
Original assignee: XI'AN CENTER OF GEOLOGICAL SURVEY CGS
Current assignee: XI'AN CENTER OF GEOLOGICAL SURVEY CGS
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2021-11-19
Anticipated expiration: 2037-12-28
Also published as: CN108171772A

Abstract

The invention discloses a method for extracting river boundaries by utilizing mapGIS, CJKCOOR _ Ver and DELF3D, which specifically comprises the following steps: and acquiring river boundary points on the map by using mapGIS, converting the longitude and latitude values of the boundary points into geodetic coordinates by using CJKCOOR _ Ver, and drawing the river basin boundary by using DELF 3D. The invention has the advantages that: 1. river boundaries can be simply and conveniently extracted as long as mapGIS software can be operated without operating ARCGIS software; 2. the mapGIS software can process point files without attributes or unmatched attributes, and the application range is wider.

Description

Method for extracting river boundary by using mapGIS, CJKCOOR _ Ver and DELF3D

Technical Field

The invention relates to a method for extracting river boundaries, in particular to a method for extracting river boundaries by using mapGIS, CJKCOOR _ Ver and DELF3D, and belongs to the technical field of hydraulic engineering.

Background

When the river basin boundary is extracted, river flow area calculation and river hydrological parameter extraction are the basis, and have important influence on the accuracy of hydrological analysis and calculation. In the past, longitude and latitude are mostly acquired in an ARGIS, then stored in an Excel format, the longitude and latitude values in the Excel format are converted into geodetic coordinates in batch in CJKCOOR _ Ver2.0 software, then the geodetic coordinates are transferred into an Excel format file to obtain X and Y relative coordinates (compared with the minimum value), and finally, DELF3D or EFDC self-contained programs are used for drawing the border of the basin. However, for those who do not use ARCGIS or for those who only use mapGIS format for their drawings, it is difficult to analyze the hydrological problem by the existing methods.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a method for extracting river boundaries by using mapGIS, CJKCOOR _ Ver and DELF3D, which is simple in operation and convenient to use.

In order to achieve the above object, the present invention adopts the following technical solutions:

a method for extracting river boundaries is characterized in that extraction is carried out by using mapGIS, CJKCOOR _ Ver and DELF3D, and specifically comprises the following steps:

first, utilize mapGIS to obtain the river boundary point on the picture, the longitude and latitude value of WT

1. WT, clicking graphic processing-file conversion-data conversion, and resetting a default ID number for the basin boundary point;

2. editing a point attribute structure in attribute library management;

3. opening river boundary points in a projection transformation system, carrying out projection transformation on the river boundary points, WT directly, then setting target projection parameters to be changed into a geographical coordinate system by referring to whether current projection parameters are correct or not, clicking to start transformation, determining a button, and storing the river boundary points and WT files;

4. the WT file is opened, the attribute is selected at the toolbar point position or is annotated and generated, then the primitive file river boundary point is opened, the WT is clicked to see whether the attribute is correct or not, the conversion is clicked, and the text file river boundary point is saved after the conversion;

5. then opening a text file in the Excel, and storing the text file in an Excel format;

converting longitude and latitude values of boundary points into geodetic coordinates by using CJKCOOR _ Ver

1. Converting longitude and latitude values of Excel format into file river boundary points, BL format files, and then converting the longitude and latitude values into geodetic coordinates in batch in CJKCOOR _ Ver software to obtain file river boundary points, XY format files;

2. converting the XY format file into an Excel format file, calculating the minimum value in X, Y, and subtracting the minimum value in each column from the data in each column to calculate X, Y relative coordinates;

thirdly, drawing the basin boundary by using DELF3D

The XY coordinates are converted into an SPl file in DELF3D, the SPl file is opened, boundary conditions are edited, grid division is carried out, a GRD file is stored, and a Coordinate System is added into the GRD file, so that the GRD file can be used in river simulation software.

The method for extracting the river boundary is characterized in that, in the first step, after the target projection parameters are set to be changed into the geographic coordinate system, when the control points are insufficient, TIC points in a file used in the conversion process are removed.

The invention has the advantages that:

1. river boundaries can be simply and conveniently extracted as long as mapGIS software can be operated without operating ARCGIS software;

2. the mapGIS software can process point files without attributes or unmatched attributes, and the application range is wider.

Drawings

FIG. 1 is an interface for converting river boundary point data in mapGIS software;

FIG. 2 is an interface for editing point attribute structures in the mapGIS software property library management;

FIG. 3 is an interface for opening river boundary points without latitude and longitude attributes in the mapGIS software projective transformation system;

FIG. 4 is an interface of projective transformation at mapGIS software;

FIG. 5 is an interface for opening a current cast in the mapGIS software projective transformation directory;

FIG. 6 is an interface of object projections in the mapGIS clustered projective transformation catalog;

FIG. 7 is an interface of a river boundary point simultaneously obtaining latitude and longitude attributes and converting the attributes into text files;

FIG. 8 is an interface for converting longitude and latitude values of river boundary points into geodetic coordinates in CJKCOOR _ Ver software;

FIG. 9 is a river boundary point the interface where the SPl file is opened;

FIG. 10 is an interface for DELF3D to draw a basin boundary split map.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

The method for extracting the river boundary utilizes mapGIS, CJKCOOR _ Ver and DELF3D to extract, and specifically comprises the following steps:

Step 1: in mapGIS, river boundary points are imported, WT clicks on graphic processing-file conversion-data conversion (see FIG. 1), and the default ID numbers are reset for the river boundary points.

Step 2: the point attribute structure is edited in the attribute library management (see fig. 2).

And 3, step 3: opening a river boundary point in a projection transformation system, wherein a WT file (see figure 3) is used for directly carrying out projection transformation on the river boundary point, wherein the WT file (see figure 4) is used for carrying out projection transformation, then, whether current projection parameters are correct or not is referred to as figure 5, target projection parameters are set to be changed into a geographical coordinate system (see figure 6), when control points are insufficient, a TIC point in the file used in the transformation process is removed, the transformation is started by clicking, a button is determined, and the river boundary point, WT file is stored.

And 4, step 4: the WT file, the toolbar selection point location or the annotation generation attribute (see FIG. 7), then opens the primitive file river boundary point.

And 5, step 5: and then opening a text file in the Excel, and storing the text file in the Excel format.

Secondly, converting longitude and latitude values of the boundary points into geodetic coordinates by using CJKCOOR _ Ver, and the step 1: converting the latitude and longitude values in the Excel format into file river boundary points, converting BL format files, and then converting the latitude and longitude values into geodetic coordinates in batches in CJKCOOR _ Ver software (see figure 8) to obtain file river boundary points, XY format files.

Step 2: and converting the XY format file into an Excel format file, calculating the minimum value in X, Y, and subtracting the minimum value in each column from the data in each column to obtain X, Y relative coordinates.

Thirdly, drawing the basin boundary by using DELF3D

The XY coordinates are converted into an SPl file in DELF3D, the SPl file is opened (see fig. 9), the boundary conditions are edited, the grid is divided, a GRD file is stored, and finally a Coordinate System is added into the GRD file, which can be used in river simulation software, and a basin boundary subdivision diagram drawn by DELF3D is shown in fig. 10.

Therefore, the method for extracting the river boundary provided by the invention only needs to operate mapGIS software, does not need to operate ARCGIS software, and is very simple and convenient to operate.

It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the protection scope of the present invention.

Claims

1. The method for extracting the river boundary by using mapGIS, CJKCOOR _ Ver and DELF3D is characterized by comprising the following steps:

2. editing a point attribute structure in attribute library management;

3. opening river boundary points in a projection transformation system, carrying out projection transformation on the river boundary points, WT directly, judging whether current projection parameters are correct or not, setting target projection parameters to be a geographical coordinate system, clicking to start transformation, determining a button, and storing the river boundary points and WT files;

thirdly, drawing the basin boundary by using DELF3D

The XY coordinates are converted into an SPl file in DELF3D, the SPl file is opened, boundary conditions are edited, grid division is performed, a GRD file is stored, and a Coordinate System is added to the GRD file, wherein the GRD file can be used in river simulation software, wherein:

in the first step, after the target projection parameters are set to be changed into the geographic coordinate system, when the control points are insufficient, the TIC points in the file used in the conversion process are removed.