CN105426521A - Chart database with three-level indexing structure and data reading method thereof - Google Patents
Chart database with three-level indexing structure and data reading method thereof Download PDFInfo
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- CN105426521A CN105426521A CN201510888549.3A CN201510888549A CN105426521A CN 105426521 A CN105426521 A CN 105426521A CN 201510888549 A CN201510888549 A CN 201510888549A CN 105426521 A CN105426521 A CN 105426521A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/50—Information retrieval; Database structures therefor; File system structures therefor of still image data
- G06F16/51—Indexing; Data structures therefor; Storage structures
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Abstract
The invention relates to a chart data index, and in particular relates to a chart database with a three-level indexing structure and a data reading method thereof. According to the invention, a chart index is designed in the chart database; a chart can be retrieved through the chart index; simultaneously, internal indexes of various charts are designed; the internal indexes include object classification indexes and object indexes in the corresponding charts; the object classification indexes and the object indexes of the corresponding charts can be sequentially searched according to classification attributes and characteristic attributes of objects in need of being displayed in a target display area; and thus, the objects in need of being displayed can be located and displayed. By means of the three-level indexing structure, the chart data reading speed can be greatly increased; and thus, the chart display speed is increased.
Description
Technical field
The present invention relates to chart data index, particularly relate to a kind of chart zoom and the method for reading data thereof with three level list structure.
Background technology
Sea chart procedure for displaying relates to the reading to chart data in chart zoom.Chart zoom comprises some sea charts, and comprise again dissimilar a large amount of thing marks in each sea chart, therefore chart zoom relates to huge data volume.But traditional chart zoom is not owing to designing chart index and thing mark category index, cause chart data to read comparatively slow, sea chart display speed is low.
Summary of the invention
Technical matters to be solved by this invention is, proposes a kind of chart zoom and the method for reading data thereof with three level list structure, to improve the reading speed to chart data.The present invention is achieved in that
Have a chart zoom for three level list structure, chart zoom comprises some sea charts, and chart zoom has chart index; Described chart index comprises the index information of each sea chart, and the index information of sea chart comprises the coverage area information of sea chart; Each sea chart has respective inside index respectively; Described inner index comprises thing mark category index and thing mark index; Described thing mark category index comprises the index information of each thing mark type in its corresponding sea chart; The index information of thing mark type comprises the categorical attribute of thing mark type; Described thing mark index comprises each thing target index information of its homologue mark type; Thing target index information comprises thing target characteristic attribute.
Further, the index information of sea chart also comprises at least one in chart numbering, scale denominator, benchmark latitude circle radius, coordinate times multiplying factor, the depth of water times multiplying factor.
Further, in described chart index, the index information ascending sequence of chi denominator in proportion of each sea chart; When there being the index information of new sea chart to import described chart index, according to the ordering rule of index information in the scale denominator size in the index information of this new sea chart and described chart index, the index information of this new sea chart is imported described chart index.
Further, the index information of thing mark type also comprises the type thing target position, length and number information.
Further, described characteristic attribute comprises at least one in thing target length, position, geometric type, affiliated area, reference space thing mark number, space thing mark, direction, space thing cursor position.
Have a method for reading data for the chart zoom of three level list structure, chart zoom comprises some sea charts, and chart zoom has chart index; Described chart index comprises the index information of each sea chart, and the index information of sea chart comprises the coverage area information of sea chart; Each sea chart has respective inside index respectively; Described inner index comprises thing mark category index and thing mark index; Described thing mark category index comprises the index information of each thing mark type in its corresponding sea chart; The index information of thing mark type comprises the categorical attribute of thing mark type; Described thing mark index comprises each thing target index information of its homologue mark type; Thing target index information comprises thing target characteristic attribute;
Described method comprises the steps:
Step 1: read described chart index, and judge the overlay area of each sea chart in chart zoom and the position relationship of target viewing area;
Step 2: using overlay area and described target viewing area not from each sea chart as the relevant sea chart of described target viewing area; The index information of each relevant sea chart forms relevant chart folio catalogue;
Step 3: read each relevant sea chart according to relevant chart folio catalogue from chart zoom, and extract in each relevant sea chart the part be in described target viewing area, to draw the sea chart of described target viewing area;
Step 4: thing mark category index and the thing mark index of searching corresponding sea chart according to the thing target categorical attribute needing in described target viewing area to show and characteristic attribute successively, to locate the thing mark needing display, and is shown.
Further, the overlay area of sea chart and target viewing area represent with maximum latitude, minimum latitude, maximum longitude and minimum longitude; In described step 1, the relation according to the maximum latitude of the overlay area of each sea chart, minimum latitude, maximum longitude and minimum longitude and the maximum latitude of target viewing area, minimum latitude, maximum longitude and minimum longitude judges the overlay area of each sea chart in chart zoom and the position relationship of target viewing area.
Further, if the maximum latitude of target viewing area, minimum latitude, maximum longitude and minimum longitude are respectively maxlatX, minlatX, maxlonX, minlonX; The maximum latitude of the overlay area of the i-th width sea chart, minimum latitude, maximum longitude and minimum longitude are respectively maxlati, minlati, maxloni, minloni; Then:
When meeting following condition for the moment, the overlay area of the i-th width sea chart and target viewing area from:
MaxlatX≤minlati；
MinlatX≥maxlati；
MaxlonX≤minloni；
MinlonX≥maxloni；
When to meet following condition simultaneously, the overlay area of the i-th width sea chart is included in target viewing area:
MaxlatX≥minlati；
MinlatX≤maxlati；
MaxlonX≥minloni；
MinlonX≤maxloni；
When to meet following condition simultaneously, target viewing area is included in the overlay area of the i-th width sea chart:
MaxlatX≤minlati；
MinlatX≥maxlati；
MaxlonX≤minloni；
MinlonX≥maxloni；
All the other situations are that target viewing area is crossing with the overlay area of the i-th width sea chart.
Compared with prior art, the present invention designs chart index in chart zoom, can retrieve sea chart by chart index.Simultaneously, devise the inside index of each sea chart, inner index comprises thing mark category index in corresponding sea chart and thing mark index, thing mark category index and the thing mark index of corresponding sea chart is searched successively according to the thing target categorical attribute needing in target viewing area to show and characteristic attribute, the thing mark needing display can be located, and shown.Substantially increased the reading speed of chart data by this three level list structure, thus improve sea chart display speed.
Accompanying drawing explanation
Fig. 1: the three level list structural representation of what the embodiment of the present invention provided the have chart zoom of three level list structure;
Fig. 2: the digital independent schematic flow sheet with the chart zoom of three level list structure.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.
Figure 1 shows that this has the three level list structural representation of the chart zoom of three level list structure.This chart zoom with three level list structure comprises some sea charts, chart zoom has chart index 1, chart index 1 comprise each sea chart (sea chart 1, sea chart 2, sea chart 3 ..., sea chart n) index information, the index information of sea chart comprises the coverage area information of sea chart.The sea chart meeting querying condition can be found by chart index 1.Meanwhile, each sea chart has respective inside index respectively, and the inner cable by each sea chart draws the thing mark searching this sea chart inside found further.Inner index comprises thing mark category index 2 and thing mark index 3.Thing mark category index comprises the index information of each thing mark type in its corresponding sea chart, and the index information of thing mark type comprises the categorical attribute of thing mark type.The all types of thing mark meeting querying condition in corresponding sea chart can be inquired further by thing mark category index 2.Thing mark index 3 comprises each thing target index information of its homologue mark type, and thing target index information comprises thing target characteristic attribute.Finally can be found the thing target position meeting querying condition in corresponding sea chart by thing mark index 3, thus read and show in sea chart.
The inside index of each sea chart and chart index 1 together constitute the three level list structure of chart zoom, can quick position sea chart by chart index 1, and can the characteristic body mark of quick position sea chart inside and space thing mark by the inside index of sea chart, realize the quick reading to chart data.
The inside index of sea chart 1 has been shown in Fig. 1.The inside index of other sea charts is identical with the inner cable guiding structure of sea chart 1.Sea chart 1 comprises n class thing mark altogether, the thing mark category index 2 of sea chart 1 comprise the 1st class thing target index information, the 2nd class thing target index information ..., and the n-th class thing target index information.Comprise again n thing mark in 1st class thing mark, the 1st class thing subject matter mark index 3 comprise the index information of thing mark 1, thing mark 2 index information ..., thing mark n index information.
The index information of sea chart also can comprise chart numbering, scale denominator, benchmark latitude circle radius, coordinate times multiplying factor, the depth of water times multiplying factor etc.In sea chart display, the sea chart that engineer's scale is large shows more detailed information, should pay the utmost attention to when sea chart display.Therefore, on the basis of this three level list structure, can by the ascending sequence of chi denominator in proportion of the index information of each sea chart, when there being the index information of new sea chart to import chart index 1, the index information of this new sea chart is imported chart index 1 by the ordering rule according to index information in the scale denominator size in the index information of this new sea chart and chart index 1.
The index information of thing mark type also comprises the type thing target position, length and number information.Characteristic attribute comprises thing target length, position, geometric type, affiliated area, reference space thing mark number, space thing mark, direction, space thing cursor position etc.These index informations also can be used as thing target querying condition.
The method for reading data of the chart zoom with above-mentioned three level list structure is comprised the steps:
Step S1: read chart index 1, and judge the overlay area of each sea chart in chart zoom and the position relationship of target viewing area;
Step S2: using overlay area and target viewing area not from each sea chart as the relevant sea chart of target viewing area; The index information of each relevant sea chart forms relevant chart folio catalogue;
Step S3: read each relevant sea chart according to relevant chart folio catalogue from chart zoom, and extract in each relevant sea chart the part be in target viewing area, to draw the sea chart of target viewing area;
Step S4: thing mark category index 2 and the thing mark index 3 of searching corresponding sea chart according to the thing target categorical attribute needing in target viewing area to show and characteristic attribute successively, to locate the thing mark needing display, and is shown.
The overlay area of sea chart and target viewing area represent with maximum latitude, minimum latitude, maximum longitude and minimum longitude.In step 1, the overlay area of each sea chart in chart zoom and the position relationship of target viewing area can be judged according to the relation of the maximum latitude of the overlay area of each sea chart, minimum latitude, maximum longitude and minimum longitude and the maximum latitude of target viewing area, minimum latitude, maximum longitude and minimum longitude.
Such as, if the maximum latitude of target viewing area, minimum latitude, maximum longitude and minimum longitude are respectively maxlatX, minlatX, maxlonX, minlonX; The maximum latitude of the overlay area of the i-th width sea chart, minimum latitude, maximum longitude and minimum longitude are respectively maxlati, minlati, maxloni, minloni; Then:
When meeting following condition for the moment, the overlay area of the i-th width sea chart and target viewing area from:
MaxlatX≤minlati；
MinlatX≥maxlati；
MaxlonX≤minloni；
MinlonX≥maxloni；
When to meet following condition simultaneously, the overlay area of the i-th width sea chart is included in target viewing area:
MaxlatX≥minlati；
MinlatX≤maxlati；
MaxlonX≥minloni；
MinlonX≤maxloni；
When to meet following condition simultaneously, target viewing area is included in the overlay area of the i-th width sea chart:
MaxlatX≤minlati；
MinlatX≥maxlati；
MaxlonX≤minloni；
MinlonX≥maxloni；
All the other situations are that target viewing area is crossing with the overlay area of the i-th width sea chart.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. have a chart zoom for three level list structure, it is characterized in that, chart zoom comprises some sea charts, and chart zoom has chart index; Described chart index comprises the index information of each sea chart, and the index information of sea chart comprises the coverage area information of sea chart; Each sea chart has respective inside index respectively; Described inner index comprises thing mark category index and thing mark index; Described thing mark category index comprises the index information of each thing mark type in its corresponding sea chart; The index information of thing mark type comprises the categorical attribute of thing mark type; Described thing mark index comprises each thing target index information of its homologue mark type; Thing target index information comprises thing target characteristic attribute.
2. chart zoom as claimed in claim 1, is characterized in that, the index information of sea chart also comprises at least one in chart numbering, scale denominator, benchmark latitude circle radius, coordinate times multiplying factor, the depth of water times multiplying factor.
3. chart zoom as claimed in claim 2, is characterized in that, in described chart index, and the index information ascending sequence of chi denominator in proportion of each sea chart; When there being the index information of new sea chart to import described chart index, according to the ordering rule of index information in the scale denominator size in the index information of this new sea chart and described chart index, the index information of this new sea chart is imported described chart index.
4. chart zoom as claimed in claim 1, it is characterized in that, the index information of thing mark type also comprises the type thing target position, length and number information.
5. chart zoom as claimed in claim 1, is characterized in that, described characteristic attribute comprises at least one in thing target length, position, geometric type, affiliated area, reference space thing mark number, space thing mark, direction, space thing cursor position.
6. have a method for reading data for the chart zoom of three level list structure, it is characterized in that, chart zoom comprises some sea charts, and chart zoom has chart index; Described chart index comprises the index information of each sea chart, and the index information of sea chart comprises the coverage area information of sea chart; Each sea chart has respective inside index respectively; Described inner index comprises thing mark category index and thing mark index; Described thing mark category index comprises the index information of each thing mark type in its corresponding sea chart; The index information of thing mark type comprises the categorical attribute of thing mark type; Described thing mark index comprises each thing target index information of its homologue mark type; Thing target index information comprises thing target characteristic attribute;
Described method comprises the steps:
Step 1: read described chart index, and judge the overlay area of each sea chart in chart zoom and the position relationship of target viewing area;
Step 2: using overlay area and described target viewing area not from each sea chart as the relevant sea chart of described target viewing area; The index information of each relevant sea chart forms relevant chart folio catalogue;
Step 3: read each relevant sea chart according to relevant chart folio catalogue from chart zoom, and extract in each relevant sea chart the part be in described target viewing area, to draw the sea chart of described target viewing area;
Step 4: thing mark category index and the thing mark index of searching corresponding sea chart according to the thing target categorical attribute needing in described target viewing area to show and characteristic attribute successively, to locate the thing mark needing display, and is shown.
7. method for reading data as claimed in claim 6, it is characterized in that, the overlay area of sea chart and target viewing area represent with maximum latitude, minimum latitude, maximum longitude and minimum longitude; In described step 1, the relation according to the maximum latitude of the overlay area of each sea chart, minimum latitude, maximum longitude and minimum longitude and the maximum latitude of target viewing area, minimum latitude, maximum longitude and minimum longitude judges the overlay area of each sea chart in chart zoom and the position relationship of target viewing area.
8. method for reading data as claimed in claim 7, is characterized in that, if the maximum latitude of target viewing area, minimum latitude, maximum longitude and minimum longitude are respectively maxlatX, minlatX, maxlonX, minlonX; The maximum latitude of the overlay area of the i-th width sea chart, minimum latitude, maximum longitude and minimum longitude are respectively maxlati, minlati, maxloni, minloni; Then:
When meeting following condition for the moment, the overlay area of the i-th width sea chart and target viewing area from:
MaxlatX≤minlati；
MinlatX≥maxlati；
MaxlonX≤minloni；
MinlonX≥maxloni；
When to meet following condition simultaneously, the overlay area of the i-th width sea chart is included in target viewing area:
MaxlatX≥minlati；
MinlatX≤maxlati；
MaxlonX≥minloni；
MinlonX≤maxloni；
When to meet following condition simultaneously, target viewing area is included in the overlay area of the i-th width sea chart:
MaxlatX≤minlati；
MinlatX≥maxlati；
MaxlonX≤minloni；
MinlonX≥maxloni；
All the other situations are that target viewing area is crossing with the overlay area of the i-th width sea chart.
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| CN201510888549.3A CN105426521B (en) | 2015-12-04 | 2015-12-04 | Chart zoom and its method for reading data with three level list structure |
| PCT/CN2016/107492 WO2017092636A1 (en) | 2015-12-04 | 2016-11-28 | Marine chart database having three-tier index architecture and method for reading data therefrom |
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| WO2017092636A1 (en) * | 2015-12-04 | 2017-06-08 | 深圳大学 | Marine chart database having three-tier index architecture and method for reading data therefrom |
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| CN105426521B (en) | 2019-04-23 |
| WO2017092636A1 (en) | 2017-06-08 |
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