Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Channel length calculating method and channel length calculating device

A channel length and calculation method technology, applied in the field of geographic information, can solve problems such as inaccurate channel length calculations, achieve the effects of reducing channel projection errors, improving calculation accuracy, and solving large channel deformation errors

Active Publication Date: 2014-07-30
BEIJING DATUM TECH DEV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in this application is to provide a channel length calculation method and device to solve the problem of inaccurate channel length calculation in the existing large-scale mosaic map, such as the case of one map of the whole country

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Channel length calculating method and channel length calculating device
  • Channel length calculating method and channel length calculating device
  • Channel length calculating method and channel length calculating device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] refer to figure 2 , shows a flow chart of steps of a channel length calculation method according to Embodiment 1 of the present application.

[0026] The channel length calculation method of this embodiment includes the following steps:

[0027] Step S102: Determine the channel whose length is to be calculated from a map.

[0028] Wherein, the one map includes multiple tiled maps spliced ​​by the first coordinate projection method.

[0029] Because when the tiled map is spliced ​​into one under the projection method adopted by itself, the boundary cannot be spliced ​​perfectly. For this reason, projection methods other than the framed map projection method are often used for splicing, so that the boundary splicing is intact, but this further increases the deformation error caused by the projection, making the calculation of the channel length inaccurate.

[0030] Step S104: Determine that the channel whose length is to be calculated is in multiple projection sub-ban...

Embodiment 2

[0041] refer to image 3, shows a flow chart of steps of a channel length calculation method according to Embodiment 2 of the present application.

[0042] In this embodiment, the basic data is the channel map in the national territory using the Albers conic equal-area projection. That is to say, this embodiment is aimed at the calculation of the channel length in one map of the whole country, that is, the calculation of the channel length in which the whole country is spliced ​​into one map from multiple tiled maps. Among them, the tiled map itself adopts the high-level-Krüger projection. In order to make the boundary stitching intact, the tiled map is stitched into a national map using the Albers projection. In order to make the calculation of the channel length more accurate and the effect better, the projection banding in this embodiment adopts the three-degree band of Gauss-Krüger. However, those skilled in the art should understand that the above-mentioned projection m...

Embodiment 3

[0059] refer to Figure 4 , shows a structural block diagram of a channel length calculation device according to Embodiment 3 of the present application.

[0060] The channel length calculation device in this embodiment includes: a determination module 302, configured to determine the channel whose length is to be calculated from a map, wherein the map includes multiple frames spliced ​​by the first coordinate projection method map; segmentation module 304, configured to determine that the channel is in a plurality of projection zones, and the projection zone is the projection zone in the second coordinate projection mode adopted by the framed map; according to where the channel is located Cutting the channel by projection sub-banding, so that each sub-channel in the multiple sub-channels after cutting is in one projection sub-band; the transformation module 306 is used to, according to the second coordinate projection method, separately transform each sub-channel Perform pro...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a channel length calculating method and a channel length calculating device. The channel length calculating method includes: determining a channel with a length to be calculated from a map; determining that the channel is positioned in a plurality of projection zones; cutting the channel according to a projection zone of the channel and positioning each of a plurality of cut sub-channels in one projection sub-zone; respectively transforming projection of each sub-channel according to a second coordinate projection mode; and calculating the length of each sub-channel after projection transformation and summing up the lengths of all the sub-channels to obtain the length of the channel with the length to be calculated. The map comprises a plurality of sub-maps spliced in a first coordinate projection mode, and the projection zones are in the second coordinate projection mode adopted by the sub-maps. By the aid of the channel length calculating method and the channel length calculating device, channel projection errors are decreased, and channel length calculating precision is improved.

Description

technical field [0001] The present application relates to the technical field of geographic information, in particular to a channel length calculation method and device. Background technique [0002] In geographic information systems, erosion channels usually refer to linearly extending trough-shaped depressions, which are eroded landforms formed by temporary flowing water. It mainly develops on the loose sedimentary layer in the semi-arid climate zone. In the gentle slope area with sparse vegetation, the erosion gullies can develop rapidly, causing the terrain to be strongly divided, encroaching on the cultivated land, destroying the road, and causing a large amount of soil erosion. Therefore, it is necessary to conduct a general survey and analysis of the erosion ditch, and then formulate corresponding control strategies. [0003] In the process of census and analysis of erosion trenches, channel length calculation is an essential step. Among them, the length of the curv...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G09B29/00G01B11/03
Inventor 李团宏
Owner BEIJING DATUM TECH DEV
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com