CN113284407A - Geographic element map matching system supporting multiple map sources and multiple scales - Google Patents
Geographic element map matching system supporting multiple map sources and multiple scales Download PDFInfo
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Abstract
The invention discloses a geographic element map matching system supporting multiple map sources and multiple scales, which comprises: the source data batch import module is used for converting more than one map source data imported by a user under an appointed data packet into a unified data packet, graph blocks, graph layers and element data structure and then displaying a source data detailed graph layer list of each graph block in each data packet and a source data summarizing graph layer list of each data packet; the layer screening and pattern configuration module is used for generating a preview layer according to screening conditions input by a user, transmitting a pattern configured on the preview layer by the user to each element under the preview layer, and recording priorities of a data packet, a pattern block and the layer set by the user; and the map matching real-time rendering module organizes the rendering sequence of the elements according to the priority set by the user, reads the styles of the elements to perform map drawing, and displays the rendered map to the user. The invention can realize the fusion map matching effect of multi-source geographic elements and simultaneously support the batch storage, import and export of styles.
Description
Technical Field
The invention relates to a geographic element map matching system supporting multiple map sources and multiple scales, which can efficiently and flexibly match patterns of vector geographic elements of multiple sources and multiple scales and support batch storage, import and export of the patterns.
Background
The vector map matching system is an important component of a GIS platform and is a tool for a user to make a custom map. The visual real-time map matching system provides rich colors, line types and symbol patterns for a user to select, after the user imports source data, the user screens out required geographic elements, selects the patterns to match, controls the drawing sequence of each geographic element, and can check the rendering effect in real time in a preview window. Meanwhile, the matching system supports the storage, the import and the export of the styles.
GIS platforms (ArcGis, MapInfo, SuperMap and MapGis) at home and abroad are provided with a visual real-time mapping system and support the mixed mapping of multi-source vector data (such as shape, IHO-S57) in the same rendering window. But all have the following disadvantages: (1) map source data cannot be imported in batches. The premise of style mapping is to import map source data, and map source data import of the existing mapping system takes a picture block as a unit, namely, only map source data of one region is imported each time. In reality, a topographic map to be previewed for matching is often formed from map source data for a series of areas, rather than map source data for more than one area. Mixing the raw materials in a ratio of 1: for example, a 100w military standard vector topographic map is composed of map source data of 90 regions nationwide, and the map source data must be manually imported 90 times to preview the nationwide map. (2) The same type layers among different map source data cannot be subjected to batch map matching. Most of map source data of the same source contains layers of the same type, and the layers of the same type are usually matched with the same type. But since the unit of data import is a tile, the operation unit of the style matching is a single layer in a single tile. Still taking the above-mentioned national maps as an example, previewing the national maps requires repeating the matching 90 times for each type of map layer, which is inefficient. (3) Only the drawing priority of the layer level can be set, the priority cannot be set by taking the graph source or the graph block as a whole, and the flexibility of matching the graph is lacked. Because each graph block is decomposed into each graph layer after being imported, the entities of the graph source and the graph block do not exist any more, and therefore the gland relation between different graph sources and different graph blocks cannot be controlled.
In summary, the conventional matching system has inconvenience and defects in practical use, and cannot realize complex cross fusion matching of multiple map sources, multiple image blocks and multiple scales. Therefore, a flexible and efficient map matching system is needed to be designed, which supports batch import of source data and batch style configuration of similar layers and has the efficiency of map matching; the method has the advantages that the drawing sequence freedom degrees of the graph source, the graph block and the graph layer level are achieved at the same time, and the gland relation can be displayed by elements in any sequence and any granularity; a user can realize the fusion map matching effect of the multi-source geographic elements by following the operation specification, and meanwhile, the batch storage, import and export of styles are supported.
Disclosure of Invention
The invention aims to provide a geographic element map matching system supporting multiple map sources and multiple scales, which supports batch import of multiple map source data and batch style configuration of similar map layers among the map source data of different sources and has high map matching efficiency; the method has the advantages that the drawing sequence freedom degrees of the graph source, the graph block and the graph layer level are achieved at the same time, and the gland relation can be displayed by elements in any sequence and any granularity; a user can realize the fusion map matching effect of the multi-source geographic elements by following the operation specification, and meanwhile, the batch storage, import and export of styles are supported.
The invention aims to be realized by the following technical scheme:
a geographic element map matching system supporting multiple map sources and multiple scales comprises a source data batch import module, a layer screening and pattern configuration module and a map matching real-time rendering module;
the source data batch import module converts more than one map source data imported by a user under a specified data packet into a unified data packet-a graph block-a graph layer-a data structure of elements, and then displays two list interfaces to the user: the detailed source data layer list of each image block in each data packet and the summary source data layer list of each data packet;
the layer screening and pattern configuration module screens the source data summary layer list according to the screening conditions input by the user, and selects the layers which meet the screening conditions and are similar to each other to generate preview layers; transmitting the style configured on the preview layer by the user to each element under the preview layer; recording the layer priority set by a user for a preview layer and the priorities of image blocks and data packets set in a source data detailed layer list;
and the map matching real-time rendering module organizes the rendering sequence of the elements according to the priority set by the user, then reads the styles of the elements to perform map drawing, and displays the rendered map to the user.
According to the characteristics, when the user sets the priority in the layer screening and pattern configuration module, the priorities of different data packets cannot be the same; the priority of different preview layers cannot be the same in each packet.
According to the characteristics, when the matching real-time rendering module organizes the rendering sequence, if the priorities of the image blocks are not repeated, the rendering sequence is a data packet, the image blocks, a low-priority image layer and a high-priority image layer; if the priorities of a plurality of image blocks are the same, the rendering sequence is to merge all the similar image layers of the image blocks with the priorities, and then to perform drawing according to the sequence of the data packet, the low-priority image layer after the image blocks are merged and the high-priority image layer after the image blocks are merged.
The invention has the beneficial effects that: the geographic element map matching system supporting multiple map sources and multiple scales supports batch import of map source data and batch style configuration of similar layers among different map blocks, and has high map matching efficiency; the method has the advantages that the drawing sequence freedom degrees of the graph source, the graph block and the graph layer level are achieved at the same time, and the gland relation can be displayed by elements in any sequence and any granularity; a user can realize the fusion map matching effect of the multisource and multi-scale geographic elements by following the operation specification, and simultaneously, the batch storage, import and export of styles are supported.
Drawings
Fig. 1 is a schematic diagram of a data structure of a single block.
Fig. 2 is a schematic diagram of a data structure generated by the source data batch import module after a single data packet imports batch map source data.
Fig. 3 is a detailed layer list diagram of source data.
Fig. 4 is a schematic diagram of a source data summary layer list.
FIG. 5 is an example of layer filtering.
FIG. 6 is a schematic diagram of the structure of the screened plot data.
Fig. 7 is a diagram illustrating a preview layer list.
FIG. 8 is a schematic diagram of layer pattern configuration.
Fig. 9 is a data rendering flow.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The geographic element map matching system supporting multiple map sources and multiple scales, shown in this embodiment, includes a source data batch import module, a layer screening and pattern configuration module, and a map matching real-time rendering module.
(I) source data batch import module
The source data batch import module converts more than one map source data imported by a user under a specified data packet into a unified data packet-a graph block-a graph layer-a data structure of elements, and then displays two list interfaces to the user: firstly, a detailed layer list of source data of each image block in each data packet; and secondly, summarizing the layer list of the source data of each data packet.
The data packets are self-defined operation units of the geographic element mapping system supporting multiple map sources and multiple scales, and each data packet is regarded as a top mapping unit and is created by a user. A tile is a collection of all geographic elements in a geographic region, and a packet may contain a single or multiple tiles. Layers are a collection of geographic elements of the same type, and a tile contains one or more layers. One geographic element corresponds to one geographic object entity, and one image layer comprises one or more elements.
And a conversion plug-in for realizing multi-map source data conversion is arranged in the source data batch import module. The conversion plug-in predefines conversion models of various map source data, can automatically identify and read the map source data according to a suffix name for format analysis, and is organized into a structure of an element of a block, a layer and a layer, as shown in fig. 1. Because the map source data have different sources, the map source data have different formats, such as data in a chart S-57 format, a shapefile format, and a military vector format.
The use process of the source data batch import module is as follows:
step 11: and the user executes the operation of importing the map source data on the source data batch import module. Each time the user performs import operation, the user must first designate a certain data packet and then select one or more map source data for import. The user can carry out the operation of importing the map source data on a plurality of data packets according to the requirement. Whether different map source data are imported into the same data packet or not is determined according to the map matching requirements of the user, for example, when the user wants to perform fusion map matching, source data with different scales should be imported into the same data packet, and when the user wants to perform local high-definition map matching, source data with different scales should be imported into different data packets.
Step 12: after the source data batch import module receives the imported map source data, the conversion plug-in sequentially identifies the format of each map source data, analyzes and organizes the format into the structure of a block, a layer and an element one by one, and is hung under the data packet to form the data structure of the data packet, the block, the layer and the element, as shown in fig. 2.
Step 13: the source data batch import module displays two list interfaces to a user after the conversion plug-in completes the conversion of the map source data: firstly, a detailed layer list of source data of each image block in each data packet; and secondly, summarizing the layer list of the source data of each data packet. Wherein, the detailed layer list of the source data is defined as each layer under the graph block and is traversed by the data structure of fig. 2; the source data summary layer list is defined as a union set of all layers of the same type under the specified data packet, and the union set is taken after the traversal of the data structure of the FIG. 2 and is used for subsequent batch style configuration. In the data packet, original layers with the same name in the map source data of the same source are defined as layers of the same type. For example, 1: in the 100w military standard vector map, the image blocks N0849 and N0850 both contain a water system surface image layer, and are regarded as the same type image layers. In a data packet, the layers of map source data of different sources may also contain the same name, but they must be classified as different layers. For example, in a military standard vector diagram and in IHO-S57 chart, both have a "water system surface" layer, but the military standard diagram and the chart publisher are different, and the surveying standard is different, so the military standard diagram and the chart publisher are required to be regarded as different layers. The detailed layer list of source data is shown in fig. 3, and the summarized layer list of source data is shown in fig. 4.
The source data batch import module greatly simplifies user operation, achieves the purpose of importing map source data in batches, reserves entities of data packets, image blocks and image layers after importing the map source data, and facilitates subsequent batch map matching.
Layer screening and pattern configuration module
The layer screening and pattern configuration module screens the source data summary layer list according to the screening conditions input by the user, and selects the layers which meet the screening conditions and are similar to each other to generate preview layers; transferring the pattern configured on the preview layer by the user to each element under the preview layer and storing the pattern; and storing the layer priority set by the user on the preview layer and the priorities of the image blocks and the data packets set in the source data detailed layer list.
The map source data is imported to form an original layer, and a user generally needs to screen the original layer, select a required element, match and preview the element. The detailed using process of the layer screening and pattern configuration module is as follows:
step 21: and the layer screening and pattern configuration module screens the same type of layers according to the screening conditions input by the user, and selects the layers meeting the screening conditions to generate preview layers.
In order to execute batched screening and pattern configuration, the screening operation of the layer screening and pattern configuration module is as follows: the user selects a certain layer in the summary layer list under a certain data packet, inputs a normalized screening condition (the system supports the SQL language), and generates a new custom preview layer after the system finishes screening, as shown in fig. 5. An original layer can generate a plurality of preview layers through different screening conditions. And the layer screening and pattern configuration module traverses all image blocks containing the original layer in the data packet after a user selects the layer and inputs the screening conditions, and screens all elements meeting the conditions under each image block to serve as a preview layer for subsequent drawing display. The screened data is organized as drawing data, and the structure of the drawing data is shown in fig. 6. In the system, a user only needs to perform screening operation on a certain image layer once, all image blocks can be validated, and other image matching software needs to repeatedly perform screening on the image layer under each image block.
Step 22: and the layer screening and pattern configuration module displays a preview layer list to a user. All preview layers are displayed in the preview layer list, a new preview layer is added in the preview layer list every time the preview layer list is screened, and the name of the preview layer is specified by a user during screening. The preview layer list is shown in fig. 7.
Step 23: in the preview layer list, after a user selects a preview layer, patterns such as colors, linearity, symbols and the like are set, and the layer screening and pattern configuration module transfers the patterns configured on the preview layer by the user to each element under the preview layer and stores the patterns, as shown in fig. 8. Note that under the same packet, a preview layer contains elements in multiple tiles. The user only needs to set the pattern once for the preview layer (and other map matching systems need to repeatedly set the layers under each image block one by one), and the pattern is applied to the layers under all the image blocks in real-time rendering, so that the purpose of batch pattern configuration is achieved, and the map matching efficiency is greatly improved. And the layer screening and pattern configuration module stores user setting information and is used for real-time rendering. In addition, the layer screening and pattern configuration module can organize the pattern configuration information into a configuration file, and the incidence relation among the original layer, the screening condition, the preview layer and the pattern is listed in the configuration file, so that the pattern can be stored, imported and exported.
Step 24: the user sets layer priority in the preview layer list, sets priorities of image blocks and data packets in the source data detailed layer list, and the layer screening and pattern configuration module stores the priority settings. The system provides for: and covering the preview layers under each data packet in a priority order, and covering the data packets in a priority order. Therefore, the priority of different packets cannot be the same; in a data packet, the priorities of different preview layers cannot be the same; but a preview layer may be cross-tile and thus the priority of different tiles may be the same. In the preview layer list in fig. 7, the arrangement order of the layers means the priority order, and a user can change the priority by dragging the layers. In the source data detail layer list of fig. 3, the user sets the priorities of tiles and packets.
Under the regulation, the system ensures the drawing sequence freedom degree of the graph source, the graph block and the graph layer level, and facilitates the user to implement the gland relation of various element granularities. According to the requirement of attractive pictures, a user can freely set priorities for data packets, image blocks and image layers, and a system stores user set information and is reserved for use in real-time rendering.
(III) real-time rendering module for matching pictures
And the map matching real-time rendering module organizes the rendering sequence of the elements according to the priority set by the user, then reads the styles of the elements to perform map drawing, and displays the rendered map to the user. The implementation process of the matching real-time rendering module is as follows:
step 31: and the matching real-time rendering module organizes the rendering sequence of the elements according to the priority set by the user. The rendering order directly determines the capping relationship between the elements. During rendering, if the priorities of the blocks are not repeated, drawing is carried out according to the sequence of a data packet- > blocks- > low-priority layers- > high-priority layers; if the priorities of a plurality of blocks are the same, the similar layers of all blocks with the priorities must be merged, the boundary of the blocks is broken, and the drawing is carried out according to the sequence of the low-priority layer after the data packet- > blocks are merged- > and the high-priority layer after the blocks are merged. Therefore, the user can realize the gland relation of different granularities by carefully designing the priorities of the data packet, the image block and the image layer.
Step 32: and the map matching real-time rendering module reads the style of the element to perform map drawing, and displays the rendered map to a user.
According to the steps 23 and 24, the user sets the style for each preview layer, and the data packet, the image block, and the image layer are all set with priority, the style of the read element is mapped according to the step 31, after the rendering sequence is determined, the specified style is applied to the relevant image layer in each image block for rendering, and the overall rendering flow is as shown in fig. 9. After the rendering is completed, the map presents the visual effect required by the user. The steps 31 and 32 in the actual software are executed very fast, and after the user completes the setting of the steps 23 and 24, the software finishes drawing quickly, so that the effect of self-defining matching in real time is achieved.
By way of illustration, several user mapping operation examples are given below to illustrate the use method of the geographic element mapping system supporting multiple map sources and multiple scales.
A single scale data layout of homogeneous graph sources. For example, to compare 1: and (5) matching the 100w national military standard vector topographic map. In this case, the data may include a plurality of tiles in different regions, and the similar layer patterns of different tiles should be consistent. Therefore, a user should create a data packet for the map source data, all the map source data are once imported into the data packet, preview layers are screened out from the original summary layers, and all the image blocks can be validated only by setting a pattern and a priority for each preview layer and setting the same priority for all the image blocks.
Multiple scale data mapping of homogeneous graph sources. For example, to compare the national 1: 100w, local 1: and (5 w) carrying out map matching on the military standard vector topographic map, so that a local high-definition map matching effect is achieved. In this case, the regions of the image blocks with different precisions may overlap, and the layer patterns of different scales should be represented differently. Therefore, the user should create a data packet for each scale data, and import the corresponding map source data into the respective data packet in batches. Setting priorities for the data packets according to the accuracy, setting the same priority for the image blocks of each data packet, screening preview image layers from the original summary image layers of each data packet, and setting a pattern and a priority for each preview image layer only once to enable all the image blocks to take effect. Therefore, the local high-definition map matching effect that different scale elements display different patterns and are sequentially overlapped can be achieved.
Data fusion matching of different graph sources. For example, to compare the national 1: and (3) carrying out fusion matching on a 100w military standard vector diagram and an IHO-S57 naval diagram, wherein the target is a naval-terrestrial integrated fusion matching diagram. There will be cross-plotting of the element layers in the two types of drawings. Therefore, the user should create a data packet for all data, and import all tiles in the military standard vector diagram and IHO-S57 chart into the data packet at one time. And (4) screening preview layers from the original summary layers, and setting the style and the priority for each preview layer only once, and setting the same priority for all the image blocks to enable all the image blocks to take effect. Therefore, the fusion map matching effect of cross drawing of the chart land and map elements can be achieved.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (3)
1. A geographic element map matching system supporting multiple map sources and multiple scales comprises a source data batch import module, a layer screening and pattern configuration module and a map matching real-time rendering module; the method is characterized in that:
the source data batch import module converts more than one map source data imported by a user under a specified data packet into a unified data packet-a graph block-a graph layer-a data structure of elements, and then displays two list interfaces to the user: the detailed source data layer list of each image block in each data packet and the summary source data layer list of each data packet;
the layer screening and pattern configuration module screens the source data summary layer list according to the screening conditions input by the user, and selects the layers which meet the screening conditions and are similar to each other to generate preview layers; transmitting the style configured on the preview layer by the user to each element under the preview layer; recording the layer priority set by a user for a preview layer and the priorities of image blocks and data packets set in a source data detailed layer list;
and the map matching real-time rendering module organizes the rendering sequence of the elements according to the priority set by the user, then reads the styles of the elements to perform map drawing, and displays the rendered map to the user.
2. The system for matching geographical elements with multiple map sources and multiple scales according to claim 1, wherein when the user sets the priorities in the layer filtering and pattern configuration module, the priorities of different data packets cannot be the same, and the priorities of different preview layers in each data packet cannot be the same.
3. The system for matching geographical elements with multiple map sources and multiple scales as claimed in claim 1, wherein when the real-time rendering module for matching maps organizes the rendering sequence, if the priorities of the tiles are not repeated, the rendering sequence is a data packet, a tile, a low-priority layer, and a high-priority layer; if the priorities of a plurality of image blocks are the same, the rendering sequence is to merge all the similar image layers of the image blocks with the priorities, and then to perform drawing according to the sequence of the data packet, the low-priority image layer after the image blocks are merged and the high-priority image layer after the image blocks are merged.
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