CN113641642A - Method and system for calling topographic map data based on shp format - Google Patents
Method and system for calling topographic map data based on shp format Download PDFInfo
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- CN113641642A CN113641642A CN202111194996.0A CN202111194996A CN113641642A CN 113641642 A CN113641642 A CN 113641642A CN 202111194996 A CN202111194996 A CN 202111194996A CN 113641642 A CN113641642 A CN 113641642A
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Abstract
The invention provides a method and a system for calling topographic map data based on an shp format, which relate to the technical field of topographic map data processing and search a subfile path with an shp suffix under a preset path; processing and numbering each found shp file, and storing the shp files into a numbering cache pool; judging whether a serial number with preset conditions exists in the serial number cache pool or not; if the number has the preset condition, the map is represented as the all-element data in the basic scale topographic map, and the path of the all-element data is stored in a result cache pool; and analyzing to obtain all-element data contained in each folder path, and storing the all-element data in a result cache pool. The method does not depend on ArcGIS and other GIS software, can appoint any folder as a root directory to start scanning and output result information, has the characteristics of high efficiency, simple and convenient operation and accurate result, and can effectively overcome the defect of manually identifying all-element data.
Description
Technical Field
The invention relates to the technical field of topographic map data processing, in particular to a method and a system for calling topographic map data based on an shp format.
Background
The shp format is a file format commonly used by geographic information data editing software ArcGIS, and is a file capable of storing geographic information data, which is called a shape file. The shape file contains a main file, an index file, and a dBASE table. Since the main file suffix is. shp, all files of shape are collectively referred to as shp files for short.
Since ArcGIS is widely used in governments, enterprises, schools, and other related departments and organizations of geographic information data, the shp format becomes one of the main file formats for storing geographic information data.
Just as the security-related topographic map data contains geographic information data, protection of the security-related topographic map data and prevention of compromise is very important and critical.
At present, when security inspection and security protection are performed on a shp format of a secret-related basic scale topographic map, a geographic information expert usually performs field inspection, software operation and naked eye identification are performed after the shp format is opened through ArcGIS software, and a professional geographic information software is lacked to accurately and efficiently identify whether full-factor data is contained. The secret inspection means for identification and distinction through the manual operation software has low efficiency, is easy to cause misjudgment and missed judgment, and even has the risk of secondary data leakage, so huge potential safety hazards exist.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for calling topographic map data based on an shp format, which can accurately and efficiently judge whether the shp format contains all-element data in the national basic scale topographic map specification.
Specifically, the method comprises the following steps:
step 1: searching a subfile path with an shp suffix under a preset path;
step 2: processing and numbering each found shp file, and storing the shp files into a numbering cache pool;
and step 3: judging whether a serial number with preset conditions exists in the serial number cache pool or not;
if the number has the preset condition, the map is represented as the all-element data in the basic scale topographic map, and the path of the all-element data is stored in a result cache pool;
and 4, step 4: and (4) repeating the operation of the step (1) to the operation of the step (3), analyzing to obtain all-element data contained in each folder path, and storing the all-element data in a result cache pool.
It should be further noted that step 1 further includes: and the writing program recursively traverses all folder paths under the designated partition as preset paths, and the folder paths are stored in the folder cache pool.
It should be further noted that, in step 1, a path of the folder is extracted from the folder cache pool, and sub-file paths of all shp suffixes under the path are searched.
It should be further noted that, in step 2, each shp file found in step 1 is processed in the following manner:
traversing all geographic element units in the shp file, and acquiring a first character which represents an element classification number character string value in an attribute list of the shp file;
and comparing the characters with the geographic element large-class numbers in the national standard to obtain the expressed element classes, and storing the expressed element classes into a number cache pool.
Further, in the step 4, extracting folder paths from the folder cache pool, repeating the operations of the steps 1 to 3, analyzing to obtain all-element data contained in each folder path, and storing the all-element data in the result cache pool;
and repeatedly extracting the folder path from the folder cache pool to analyze until the folder path is empty.
It should be further noted that, in step 4, the result cache pool stores the folder path where all shp files containing full-factor data in the designated partition are located, so as to provide a data basis for the next operation.
It should be further noted that the full-factor data includes: location basis data, water system data, residential and facility data, traffic data, pipeline data, country and political data, geomorphologic data, and vegetation and soil texture data.
The invention also provides a system for calling topographic map data based on the shp format, which comprises: the system comprises a searching module, a numbering processing module, a numbering cache pool, a full-element data analyzing module and a result cache pool;
the searching module is used for searching a sub-file path with an shp suffix under a preset path;
the number processing module is used for processing and numbering each found shp file and storing the shp files into a number cache pool;
the full-element data analysis module judges whether a serial number with a preset condition exists in the serial number cache pool or not;
if the number has the preset condition, the map is represented as the all-element data in the basic scale topographic map, and the path of the all-element data is stored in a result cache pool; and analyzing to obtain all-element data contained in each folder path, and storing the all-element data in a result cache pool.
Further, it should be noted that the method further includes: writing a program module and a folder cache pool;
and the compiling program module recursively traverses all folder paths under the designated partition as preset paths, and stores the folder paths into the folder cache pool.
It should be further noted that the full-element data parsing module is further configured to traverse all the geographic element units in the shp file, and obtain a first character representing an element classification number string value in an attribute list of the shp file;
and comparing the characters with the geographic element large-class numbers in the national standard to obtain the expressed element classes, and storing the expressed element classes into a number cache pool.
According to the technical scheme, the invention has the following advantages:
the method and the system can scan all shp format files on a disk, read each shp file, traverse all element unit data, acquire element unit classification numbers, summarize and count whether the shp files contain all element information specified by the country, and output result information.
The method and the system do not depend on ArcGIS and other GIS software, can appoint any folder as a root directory to start scanning and output result information, have the characteristics of high efficiency, simple and convenient operation and accurate result, and can effectively solve the defects of manually identifying all-element data.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for retrieving topographic map data based on shp format;
fig. 2 is a schematic diagram of a system for retrieving topographic map data based on shp format.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The elements and algorithm steps of the various examples described in the embodiments disclosed in the method and system for retrieving topographic map data based on shp format provided by the present invention can be implemented in electronic hardware, computer software, or a combination of both, and in the above description, the components and steps of the various examples have been generally described in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The block diagram shown in the drawing of the method and system for retrieving topographic map data based on shp format provided by the present invention is only a functional entity, and does not necessarily correspond to a physically independent entity. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
In the method and system for retrieving topographic map data based on shp format provided by the invention, the disclosed system, device and method can be realized in other modes. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.
For the method and the system for calling the topographic map data based on the shp format, which are provided by the invention, the topographic map with the national basic scale is uniformly specified by the country and is made according to different mapping scales. The contents include basic geographic elements such as residential areas, road networks, water systems, boundaries, soil texture, vegetation and the like in all regions or key areas of the country. According to the storage medium division, the method can be divided into an electronic topographic map and a paper topographic map. The shp format national basic scale electronic topographic map data storage is one of the main formats.
The national basic scale topographic map is an important drawing which is depended on by economy, national defense, scientific research and education, and is also basic data for compiling various geographic maps, thereby having extremely high importance. The country makes special provisions for the security classification of topographic map data that affects the security of the country.
In the format specification of the national basic scale topographic map, the following are explicitly pointed out: the measurement control points, water systems, residential areas and facilities, traffic, pipelines, borders and political regions, landforms, vegetation and soil texture are eight types of topographic elements which form topographic map data. The full-element data refers to data including all the above eight elements. Each major category of elements is represented by a simplified code uniformly specified by the country, and is detailed in the following table.
| Numbering | Major classes of elements |
| 1 | Positioning foundation |
| 2 | Water system |
| 3 | Residential area and facilities |
| 4 | Traffic control system |
| 5 | Pipeline |
| 6 | The border and administrative region |
| 7 | Landform |
| 8 | Vegetation and soil texture |
The method for calling the topographic map data based on the shp format is used for analyzing and processing the topographic map data based on the data of the eight elements. As shown in particular in figure 1 of the drawings,
s101: searching a subfile path with an shp suffix under a preset path;
s102: processing and numbering each found shp file, and storing the shp files into a numbering cache pool;
s103: judging whether a serial number with preset conditions exists in the serial number cache pool or not; if the number has the preset condition, the map is represented as the all-element data in the basic scale topographic map, and the path of the all-element data is stored in a result cache pool;
s104: and repeating the operation of S101-S103, analyzing to obtain all-element data contained in each folder path, and storing the all-element data in a result cache pool.
As an embodiment of the present invention, a method of making,
step 1: and the writer recursively traverses all folder paths under the specified partition and stores the found folder paths into a folder cache pool.
Step 2: and extracting a folder path from the folder cache pool, and searching sub-file paths of all shp suffixes under the folder path.
And step 3: and (3) processing each shp file found in the step (2) according to the following modes: and traversing all the geographic element units in the shp file to obtain a first character which represents an element classification number character string value in an attribute list. And comparing the character with the geographic element large-class number in the national standard to obtain the represented element class, and storing the element class in a number cache pool.
And 4, step 4: and when all the shp files under the path are processed according to the step 3, judging whether the serial numbers of all the eight types of elements are contained in the serial number cache pool. If the current folder path contains the all-element data in the national basic scale topographic map, the path is stored in the result cache pool.
And 5: and (4) extracting the path of the next folder from the folder cache pool, repeating the operation of the step 2 to the step 4, and analyzing in sequence to obtain whether each folder path contains full-factor data or not until the path in the folder cache pool is empty.
Step 6: the final result cache pool stores the folder paths where all shp files containing full-factor data in the specified partition are located, and provides a data basis for the next operation (for example, secondary file inspection).
The method does not depend on ArcGIS and other GIS software, can appoint any folder as a root directory to start scanning and output result information, has the characteristics of high efficiency, simple and convenient operation and accurate result, and can effectively solve the defects of manually identifying all-element data.
Based on the above method, the present invention further provides a system for retrieving topographic map data based on shp format, as shown in fig. 2, the system includes: the system comprises a searching module, a numbering processing module, a numbering cache pool, a full-element data analyzing module and a result cache pool;
the searching module is used for searching a sub-file path with an shp suffix under a preset path;
the number processing module is used for processing and numbering each found shp file and storing the shp files into a number cache pool;
the full-element data analysis module judges whether a serial number with a preset condition exists in the serial number cache pool or not;
if the number has the preset condition, the map is represented as the all-element data in the basic scale topographic map, and the path of the all-element data is stored in a result cache pool; and analyzing to obtain all-element data contained in each folder path, and storing the all-element data in a result cache pool.
The full-element data analysis module is also used for traversing all the geographic element units in the shp file and acquiring a first character which represents an element classification number character string value in an attribute list of the shp file;
and comparing the characters with the geographic element large-class numbers in the national standard to obtain the expressed element classes, and storing the expressed element classes into a number cache pool.
The system of the present invention further comprises: writing a program module and a folder cache pool;
and the compiling program module recursively traverses all folder paths under the designated partition as preset paths, and stores the folder paths into the folder cache pool.
For the present invention, a shp typically represents only one element level, as compared to the prior art, where only the same type of geographic element unit is typically stored in a shp. If eight elements in the national basic scale topographic map are to be stored, the eight elements need to be saved into a plurality of shp files, and the shp files are stored in the same level folder. Therefore, all shp files in the same folder level need to be summarized and analyzed to determine whether all shp files contain all-factor information. In order to find all shp files under the same level folder, file traversal is required.
The system of the present invention first finds and caches all folder paths under the designated partition.
And then searching whether the file of the shp suffix exists under each folder. And if so, reading each shp file data, and traversing the attribute lists of all the geographic element units. The GB column (or other column indicating the class number) indicating the element class number is read from the attribute list, thereby obtaining the class number of the current element unit. And finally, obtaining the element information of the current geographic element unit according to a classification number brevity code table specified by the country.
When all the shp files under the folder are analyzed, final summarizing analysis can be carried out: if the data in all the shp files under the folder contains all the eight types of element information, the current folder contains all the element data, otherwise, the folder does not contain the element data.
The system can scan all shp format files on a disk, read each shp file, traverse all element unit data, acquire element unit classification numbers, summarize and count whether the shp files contain all element information specified by the country, and output result information.
The system related by the invention does not depend on ArcGIS and other GIS software, can appoint any folder as a root directory to start scanning and output result information, has the characteristics of high efficiency, simple and convenient operation and accurate result, and can effectively solve the defects of manually identifying all-element data.
The method and system for retrieving topographic map data based on shp format according to the present invention are described in conjunction with the embodiments disclosed herein, and may be implemented in electronic hardware, computer software, or a combination of both, where the components and steps of the various examples have been generally described in terms of functionality in the foregoing description for clarity of hardware and software interchangeability. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for calling topographic map data based on shp format is characterized in that the method comprises the following steps:
step 1: searching a subfile path with an shp suffix under a preset path;
step 2: processing and numbering each found shp file, and storing the shp files into a numbering cache pool;
and step 3: judging whether a serial number with preset conditions exists in the serial number cache pool or not;
if the number has the preset condition, the map is represented as the all-element data in the basic scale topographic map, and the path of the all-element data is stored in a result cache pool;
and 4, step 4: and (4) repeating the operation of the step (1) to the operation of the step (3), analyzing to obtain all-element data contained in each folder path, and storing the all-element data in a result cache pool.
2. The method for retrieving topographic map data in accordance with claim 1, wherein the mapping includes a mapping of the shp format to the shp format,
the step 1 further comprises: and the writing program recursively traverses all folder paths under the designated partition as preset paths, and the folder paths are stored in the folder cache pool.
3. The method for retrieving topographic map data in accordance with claim 2, wherein the mapping includes a mapping of the shp format to the shp format,
in step 1, a path of the folder is extracted from a folder cache pool, and sub-file paths of all shp suffixes under the path are searched.
4. The method for retrieving topographic map data in accordance with claim 3, wherein the mapping includes a mapping of the shp format to the shp format,
in step 2, each shp file found in step 1 is processed in the following manner:
traversing all geographic element units in the shp file, and acquiring a first character which represents an element classification number character string value in an attribute list of the shp file;
and comparing the characters with the geographic element large-class numbers in the national standard to obtain the expressed element classes, and storing the expressed element classes into a number cache pool.
5. The method for retrieving topographic map data in accordance with claim 3, wherein the mapping includes a mapping of the shp format to the shp format,
in the step 4, extracting folder paths from a folder cache pool, repeating the operations in the steps 1-3, analyzing to obtain all-element data contained in each folder path, and storing the all-element data in a result cache pool;
and repeatedly extracting the folder path from the folder cache pool to analyze until the folder path is empty.
6. The method for retrieving topographic map data on the basis of shp format according to claim 1 or 2, wherein,
in step 4, the result cache pool stores the folder paths where all shp files containing full-factor data are located in the designated partition, and provides a data basis for the next operation.
7. The method for retrieving topographic map data on the basis of shp format according to claim 1 or 2, wherein,
the full element data includes: location basis data, water system data, residential and facility data, traffic data, pipeline data, country and political data, geomorphologic data, and vegetation and soil texture data.
8. A system for retrieving topographic map data based on shp format, which is characterized in that the method for retrieving topographic map data based on shp format as claimed in any one of claims 1 to 7 is adopted;
the system comprises: the system comprises a searching module, a numbering processing module, a numbering cache pool, a full-element data analyzing module and a result cache pool;
the searching module is used for searching a sub-file path with an shp suffix under a preset path;
the number processing module is used for processing and numbering each found shp file and storing the shp files into a number cache pool;
the full-element data analysis module judges whether a serial number with a preset condition exists in the serial number cache pool or not;
if the number has the preset condition, the map is represented as the all-element data in the basic scale topographic map, and the path of the all-element data is stored in a result cache pool; and analyzing to obtain all-element data contained in each folder path, and storing the all-element data in a result cache pool.
9. The shp format-based topographic map data retrieving system of claim 8, further comprising: writing a program module and a folder cache pool;
and the compiling program module recursively traverses all folder paths under the designated partition as preset paths, and stores the folder paths into the folder cache pool.
10. The system of claim 8, wherein the full-element data parsing module is further configured to traverse all geographic element units in the shp file to obtain a first character in the attribute list representing an element classification number string value;
and comparing the characters with the geographic element large-class numbers in the national standard to obtain the expressed element classes, and storing the expressed element classes into a number cache pool.
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