CN107230176B - Historical resource point association degree evaluation method based on enveloping graph analysis - Google Patents
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Abstract
The invention discloses a historical resource point association degree evaluation method based on enveloping graph analysis. The method realizes scientific and rational evaluation and analysis of urban historical culture resources through the envelope, and can mine and comprehensively investigate urban culture characteristics, thereby providing guidance for building and planning design and having wide adaptability; the visibility of the evaluation result is enhanced through the visual display of the associated area and the control line obtained by the analysis of the envelope diagram; the invention ensures the accuracy of the analysis process and the result based on the computer digital platform and improves the working efficiency; the method realizes the relevance evaluation of the regional historical resource points through the envelope analysis, has portability, low technical threshold and strong operability, is suitable for urban heritage protection planning design and urban historical space resource allocation, and has practical application significance to planning engineering practice.
Description
Technical Field
The invention relates to an urban space resource evaluation method, in particular to a historical resource point association degree evaluation method based on envelope curve diagram analysis.
Background
The urban historical culture resource evaluation is an important link of building protection and urban and rural planning engineering practice, and is also an indispensable important technical means in historical culture famous city protection, historical culture block protection, building heritage protection and urban historical research. With the rapid development and wide application of computer technology and information processing technology, technical conditions are provided for evaluation and analysis of urban historical culture resources, wherein an envelope graph serving as a scientific and rational analysis method is different from traditional qualitative analysis of historical resources in space. The term Envelope is used to mean the interweaving of a plurality of lines (including straight lines, curved lines, broken lines, tangent lines, etc.), and the appearance of the lines looks like a bag, and the lines are called Envelope lines (Envelope), and the meaning of the Envelope lines and the graphic relationship of the Envelope lines are different in different subject areas. In the disciplines of building and urban and rural planning, the envelope line refers to a connecting line which is connected with each resource point in an urban space in pairs, and an envelope graph formed by interlacing of the envelope line not only indicates the association degree between the resource points, but also divides the urban space into different association areas. According to the method, the envelope curve is generated by connecting the resource points, the association degree between the resource points is judged according to the density degree of the envelope curve and the formed graph trend, and then the association area and the control line are defined, so that possibility is provided for scientific and rational analysis of historical resource evaluation. The invention can excavate the resource point relevance and the cultural characteristics in a larger range, thereby providing guidance for the structural design of a cultural landscape system, a rest activity system and a sightseeing display system, performing multi-dimensional comprehensive investigation on urban humanistic elements and cultural connotation, and having wide adaptability.
In the past building and urban and rural planning and design engineering practice, designers often conduct qualitative evaluation on urban cultural resource points through experience and subjective judgment, scientific and rational analysis technology is lacked, and the urban cultural resource points cannot be implemented in urban space. The method realizes scientific and rational evaluation and analysis of urban historical culture resources through the envelope, and can mine and comprehensively investigate urban culture characteristics, thereby providing guidance for building and planning design and having wide adaptability; the visibility of the evaluation result is enhanced through the visual display of the associated area and the control line obtained by the analysis of the envelope diagram; the invention ensures the accuracy of the analysis process and the result based on the computer digital platform and improves the working efficiency; the method realizes the relevance evaluation of the regional historical resource points through the envelope analysis, has portability, low technical threshold and strong operability, is suitable for urban heritage protection planning design and urban historical space resource allocation, and has practical application significance to planning engineering practice.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a historical resource point relevance evaluation method based on envelope curve analysis, which can solve the defects in the prior art.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:
the historical resource point association degree evaluation method based on the enveloping graph analysis comprises the following steps of:
s1: determining a historical resource point, inputting the vectorized historical resource point into a computer workstation for format conversion, and then superimposing the vectorized historical resource point to an urban digital map information platform to generate a spatial database of the historical resource point;
s2: in a spatial database of the historical resource points, drawing envelope lines by connecting the historical resource points pairwise, interweaving and overlapping the envelope lines to form a network, overlapping a city digital map to generate a historical resource envelope map, extracting and marking an outer contour line from a finally formed closed region, and visually displaying the whole envelope range of the historical resource points, namely a historical resource associated region;
s3: evaluating the historical resource envelope correlation degree by analyzing envelope density, and further dividing a historical resource correlation area into a plurality of sectors according to different envelope densities, namely different correlation sectors; and then, distinguishing each associated sector by adjusting the color gradation, analyzing a main trend line of the envelope line set according to the cluster characteristics of the envelope line, extracting the average direction of the core line set, drawing a control line, and finally outputting the result as an engineering drawing through drawing equipment.
Further, in step S1, the historical resource point is determined by: and extracting basic data of historical resource points, including historical buildings, historical structures and historical blocks, according to historical heritage or cultural resource points established in the urban general planning and urban historical protection planning.
Has the advantages that: the invention has the following beneficial effects:
1) the method realizes scientific and rational evaluation and analysis of urban historical culture resources through the envelope, and can mine and comprehensively investigate urban culture characteristics, thereby providing guidance for building and planning design and having wide adaptability;
2) the visibility of the evaluation result is enhanced through the visual display of the associated area and the control line obtained by the analysis of the envelope diagram;
3) the invention ensures the accuracy of the analysis process and the result based on the computer digital platform and improves the working efficiency;
4) the method realizes the relevance evaluation of the regional historical resource points through the envelope analysis, has portability, low technical threshold and strong operability, is suitable for urban heritage protection planning design and urban historical space resource allocation, and has practical application significance to planning engineering practice.
Drawings
FIG. 1 is a flow chart of a method in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a set of historical resource point envelopes generated by an embodiment of the present invention;
FIG. 3 is a diagram illustrating a historical resource association area generated in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a spatial database of historical resource points of a city;
FIG. 5 is a diagram of an envelope set of historical resource points for a city;
FIG. 6 is a schematic diagram of an outer contour of a city historical resource point envelope, namely, a correlation zone;
FIG. 7 is a diagram of the results of an urban historical resource point envelope density analysis grid;
FIG. 8 is a schematic diagram of the classification of a city historical resource association zone;
FIG. 9 is a schematic diagram of a historical resource association control line for a city.
Detailed Description
The technical scheme of the invention is further described in the following by combining the drawings and the detailed description.
The specific embodiment discloses a historical resource point association degree evaluation method based on enveloping graph analysis, as shown in fig. 1, the method comprises the following steps:
s1: determining a historical resource point, inputting the vectorized historical resource point into a computer workstation for format conversion, and then superimposing the vectorized historical resource point to an urban digital map information platform to generate a spatial database of the historical resource point;
s2: in a spatial database of the historical resource points, drawing envelope lines by connecting the historical resource points pairwise, interweaving and overlapping the envelope lines to form a network, overlapping a city digital map to generate a historical resource envelope map, extracting and marking an outer contour line from a finally formed closed region, and visually displaying the whole envelope range of the historical resource points, namely a historical resource associated region; as shown in fig. 2 and 3;
s3: evaluating the historical resource envelope correlation degree by analyzing envelope density, and further dividing a historical resource correlation area into a plurality of sectors according to different envelope densities, namely different correlation sectors; and then, distinguishing each associated sector by adjusting the color gradation, analyzing a main trend line of the envelope line set according to the cluster characteristics of the envelope line, extracting the average direction of the core line set, drawing a control line, and finally outputting the result as an engineering drawing through drawing equipment.
Wherein, step S1 specifically includes the following steps:
s1.1: extracting all historical cultural heritages of the whole city according to a certain city overall plan and a city historical protection plan, wherein the historical cultural heritages comprise 26 historical cultural resource points including 5 national key cultural protection units, 4 provincial cultural protection units and 17 city cultural protection units, and vector data of all the historical resource points are imported into a computer workstation;
s1.2: converting the historical resource point vector data in the step S1.1 into point parameters in an AutoCAD software platform and then storing the point parameters in a DXF format;
s1.3: in ArcGIS software, clicking 'Add Data' to select a DXF file, clicking 'Add', continuing to select 'Point', clicking 'Add' to import a Point element, right-clicking the Point element layer to select 'Data' and then selecting 'ExportData', selecting an export file storage path in a dialog box, and storing the export file storage path in an SHP format;
s1.4: loading a certain city digital map in ArcGIS software, clicking 'Add data' to select a SHP format digital map file of the city universe, clicking 'Add', clicking the point-like element SHP file obtained in the step S1.3 for importing the 'Add data', and simultaneously checking the two layers to generate a spatial database of a certain city historical resource point, as shown in FIG. 4.
Step S2 specifically includes the following steps:
s2.1: connecting all historical resource point elements pairwise in ArcGIS software, firstly creating a New layer for the line elements, specifically selecting 'Shapefile' by a right key 'New' in Catalog, and creating a New multi-segment line graph layer named as 'envelope' after specifying that Feature Type is determined as 'Polyline' in a dialog box;
s2.2: after right clicking the envelope map layer, selecting 'Edit Features' and clicking 'Start Editing', selecting Construction Tools as 'Line' form to connect two point elements, and then pressing an F2 key to generate a Line segment;
s2.3: repeating the operation of the step S2.2, and arranging and combining every two points according to the sequence of the points until all the points are covered and the connecting lines are not repeated, and finally forming a network formed by interweaving and superposing a plurality of line segments, namely a historical resource point envelope line set of a certain city, as shown in fig. 5;
s2.4: extracting and marking an outer contour line from the finally formed closed region to obtain a historical resource association region for displaying the integral envelope range of the historical resource point; specifically, selecting 'Shapefile' by a right key 'New' in Catalog, establishing a New image layer named as 'association area' after determining that the Feature Type is specified as 'Polyline' in a dialog box, right-clicking the image layer to select 'Edit Features' and clicking 'Start Editing', selecting constraint Tools as 'Line' form, describing the envelope set of the step S2.3 into a closed Line segment according to the outer contour, and finishing by pressing an F2 key; and defining a city region resource point association region of a certain city by the outline of the finally formed envelope, as shown in fig. 6.
Step S3 specifically includes the following steps:
s3.1: and (3) performing density analysis on the obtained envelope curve by using a space analysis tool of ArcGIS software, wherein the specific operations are as follows: clicking a "Line sensitivity" tool in the "sensitivity" tool set, wherein the input element in the dialog box is the envelope SHP format file in the step S2.1, clicking and determining a grid graph for analyzing envelope Density after the storage position of the output file is specified, and the darker the color is, the higher the envelope association degree is, as shown in FIG. 7;
s3.2: further dividing the historical resource association area into a plurality of sectors according to the density degree of the envelope line, wherein the denser area is an area with higher association degree, and the less association degree is the area; according to the analysis result of the step S3.1, 1 level I correlation zone with the highest correlation degree is obtained, and 2 level II correlation zones, 3 level III correlation zones and 5 level IV correlation zones are respectively divided from high to low, as shown in FIG. 8;
s3.3: extracting a main trend direction of an analysis envelope line set according to the cluster characteristics and the density of the envelope lines, and drawing a plurality of historical resource control lines according to the main trend direction, wherein the historical resource control lines comprise 1 urban historical resource control line and a plurality of urban regional control lines, so as to be used for knocking the regional axis or the historical space structure in future planning and design;
s3.4: and finally, outputting historical resource evaluation results including a historical resource envelope line set, an associated area, a control line and the like as an engineering drawing through a drawing device, and further providing reference for the settings of the features, the sightseeing path, the activity space and the like so as to be used for further deepening the detailed design of buildings, landscapes and the like in the future.
Claims (2)
1. A historical resource point association degree evaluation method based on enveloping graph analysis is characterized by comprising the following steps: the method comprises the following steps:
s1: determining a historical resource point, inputting the vectorized historical resource point into a computer workstation for format conversion, and then superimposing the vectorized historical resource point to an urban digital map information platform to generate a spatial database of the historical resource point;
s2: in a spatial database of the historical resource points, drawing envelope lines by connecting the historical resource points pairwise, interweaving and overlapping the envelope lines to form a network, overlapping a city digital map to generate a historical resource envelope map, extracting and marking an outer contour line from a finally formed closed region, and visually displaying the whole envelope range of the historical resource points, namely a historical resource associated region;
s3: evaluating the historical resource envelope correlation degree by analyzing envelope density, and further dividing a historical resource correlation area into a plurality of sectors according to different envelope densities, namely different correlation sectors; then, distinguishing each associated sector by adjusting the color level, extracting and analyzing a main trend direction of the envelope line set according to the cluster characteristics and the density degree of the envelope lines, and drawing a plurality of historical resource control lines according to the main trend direction; and finally, outputting the result as an engineering drawing through drawing equipment.
2. The method for evaluating the association degree of the historical resource points based on the enveloping graph analysis as recited in claim 1, wherein: in step S1, the historical resource point is determined by: and extracting basic data of historical resource points, including historical buildings, historical structures and historical blocks, according to historical heritage or cultural resource points established in the urban general planning and urban historical protection planning.
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