Three-dimensional spatial analysis "turn" based on GPU acceleration

Three-dimensional spatial analysis based on GPU accelerationTags: supermap geographic information System Gisit

Article: Syed

With the rapid development and popularization of three-dimensional GIS, three-dimensional spatial analysis technology has become the hotspot of GIS technology in the application of its practicability. In the face of the increasingly large-scale data processing situation, in order to meet the practical needs of GIS industry for three-dimensional spatial analysis, SUPERMAP GIS 7C (2015) provides a rich and practical three-dimensional spatial analysis function based on GPU graphics hardware acceleration, so that "instant analysis, Instant completion" of the ultra-strong performance, Including the view analysis, visual domain analysis, dynamic visual domain analysis, shadow rate statistical analysis, Skyline analysis, section line analysis, contour map analysis, slope slope analysis. These analysis functions greatly improve the practicality of three-dimensional GIS, which not only shows the brilliant visualization effect in three-dimensional scene, but also provides a very practical operation experience, which promotes the rapid development of the three-dimensional GIS in the industry application.

Three-dimensional spatial analysis technology

1 , visual analysis

The method of analysis is to analyze the ability of the observation point to the target point and whether it is obstructed by the obstacle. According to the function 1 of the visual analysis, can determine the two points of the visual, the use of different color display strategy to analyze the observation point to the target point is blocked by obstacles, and to obtain obstacles at the obstacle point, making the user's analysis more convenient and intuitive

The visual analysis can be widely used in tourism landscape evaluation, building sight occlusion judgment, monitoring coverage, communication signal coverage, military facilities layout, military fire coverage and many other aspects.

The analysis of the pass view

2 , visual domain Analysis/dynamic visual domain Analysis

Visual domain analysis is for a given observer point, based on a certain relative height, to find out whether the observer in the given range is in the area of visible coverage, and the extent of the visible area of the given point. As shown in Visual domain Analysis function 2, you can specify an observer to view the visual effects within this observer range, or you can specify a path to see the real-time dynamic visual effects of this path.

The visual domain has important application value in sightseeing browsing road choice, forest fire prevention, lookout tower layout, navigation navigation, aviation and military.

visual Domain analysis/dynamic visual domain Analysis

3 , Shadow rate statistical analysis (Rizhao analysis)

Shadow rate statistical analysis refers to the proportion of the length of time that a specified object is covered by a shadow over a specific period. Shadow Rate statistical analysis function 3, you can specify an area in a three-dimensional scene, automatically insert discrete points based on the set interval and calculate the shadow rate for each point over a specified time period, display and analyze the shadow rate phenomenon in the region through the layered coloring strategy, and support the single point shadow rate query.

Shadow rate statistical analysis can be widely used in urban planning, building design, landscape analysis and so on. For example, the planning of the building is serious impact on the surrounding building lighting, the impact of the area how big, how to adjust the height of the building, will not affect the surrounding building lighting.

Shadow Rate Analysis

4 , Skyline analysis

The skyline, also known as the city outline or panorama, is a contour line of the sky, which is composed of various topographic and landmark features. The city skyline has long been an important factor in urban design. With the emergence of high-rise buildings, high-rise buildings and super-high-rise buildings have become the decisive factors affecting the city skyline. The Skyline drawing and analysis function, shown in 4, quickly draws the skyline from any perspective and adjusts the location and height of the planned building according to the Skyline Contour, making city planning work time-saving. In the waterfront city, because the view of the city from the water surface is more open, the River (lake) shore, coastal city waterfront skyline is particularly eye-catching, the skyline analysis of the expression and recognition of urban characteristics played an important role.

Skyline AnalysisSkyline Analysis

5 , Profile line analysis

The cross section represents the change of the surface elevation along a line (section), and the traditional profile analysis is a topographic profile of a section, including the topography, geological and hydrological characteristics of the study area, and the topography, contour shape and so on. The profiling function can be used for any object in the three-dimensional scene (including buildings, underground pipelines, etc.), 5, draw a tangent in any direction, automatically generate a section line diagram, and support the acreage, position query and other functions on the section line graph.

Profile line analysis is widely used in deformation monitoring, land use planning, engineering selection, facility location, pipeline layout, coal mining and so on.

Profile Line Analysis

6 , contour map Analysis

The contour line refers to the closed curve of the adjacent points with equal elevation on the topographic map, which has important application value in hydrological characteristics, climatic characteristics, topography and location location. Contour Analysis Function 6 shows that the user can arbitrarily specify a range on the terrain, automatically acquire and draw the contours in this range in real time through a layered coloring strategy. Users can customize the density, color, fill and other properties of contour lines according to the display requirements.

Contour Analysis

7 , slope slope analysis

Slope and slope direction are two important topographic feature factors, which play an important role in terrain surface analysis. Where the slope represents a measure of the rate of change in the height of a position on the earth, and the direction of the slope change is called the slope, which represents a measure of the change in the slope direction of a position on the ground surface. Slope slope Analysis has important application value in land use, vegetation analysis, environmental assessment, landscape analysis and so on.

Slope aspect analysis function 7, the user can arbitrarily specify a range on the terrain, automatically obtained and through the layered color strategy to draw slope slope graph, to create slope slope direction arrows, so that users based on colors and arrows point to the visual view of the terrain's undulating direction and the size of the fluctuation. can also support a single point slope slope to the value of the query and other functions.

With the improvement of the performance of the programmable graphics hardware and the improvement of the advanced hardware rendering language and the maturity of the algorithm, GPU acceleration will play an increasingly important role in the field of three-dimensional GIS. The Supermap GIS 7C (2015) provides three-dimensional analysis capabilities based on GPU graphics hardware acceleration, visual domain analysis, shadow rate statistical analysis, and features such as fast real-time display, independent data sources, WYSIWYG, direct porting to mobile and client-side. On the PC with normal hardware configuration, the real-time rendering speed and display of the three-dimensional analysis results are ensured by utilizing the computing ability and programmable ability of the GPU.

Slope Slope Analysis

Three-dimensional spatial analysis "turn" based on GPU acceleration