Utilization of point cloud data by mobile mapping

1. UC-win/Road Utilization of point cloud data as reference data to create roads
   You can use it as an after-MMS processing tool or VR modeling tool to integrate with mobile mapping systems.


2. Utilization of point cloud data as a reverse analysis tool for UC-win/Road・VR model
   We propose the use of point cloud data to check VR models. For example, it can be used to guarantee the accuracy of the data and maintenance: gap analysis because of aging.

● Sample project

Outline of making sample data, "Umi-Hotaru" on Tokyo Bay Aqua Line

Sample point cloud data of Umi-Hotaru parking area on the toll road crossing Tokyo Bay has very complicated features and is a good sample to understand the difficulty and merits of point cloud data as a reference tool. Sample data consists of complicated structures like flyover ramps, a tunnel, a bridges and a parking space.
We created VR models with UC-win/Road in a short time after adjusting with a general modeling tool to some extent.

1. Data file : An excel file which has 17,000,000 coordinates.
2. File format : X coordinate, Y coordinate, Z coordinate(Height), R, G, B

● Project process in detail

1. Research and design: Understanding the point cloud data and selecting the program
2. Segmentation and positioning of the road and making the road section. Reference by VR Mesh Reverse and acquire the information.
3. At the time of creating building models, use the point cloud data for model positioning and making, and measure the accurate structures
4. VR data adjustment on UC-win/RoadVR , learn how to use the point cloud and how to create the road data.

●Advantage and disadvantage using point cloud data

Advantage

1. Accurately measure objects and roads in full 3D
2. Makes it easier to understand the project
3. The perfect way to validate data
4. Use in conjunction with CAD and Google Earth Measurement

Disadvantage

1. More time consuming
2. Extra training may be necessary
3. PC with larger capacity may be required

●Data format and how to use it

1. Data of original file format
2. File format : X coordinate, Y coordinate, Z coordinate(Height), R, G, B

●File conversion process

1. Open the file by Wordpad(Notepad can not open the Excel file because of data capacity
2. Save the file as .txt file.
3. Use GSplit to divide the text to 1,000,000pieces.
   GSplit(free soft) http://www.gdgsoft.com/gsplit/

●Overview and how to use VR Mesh Reverse

In the Umi Hotaru project, each 17 text files finally has 1,000,000 coordinates including R, G, B values. VR Mesh Reverse is the program the data can be used.
The significant merit of VR Mesh Reverse is that users can manipulate and execute millions of coordinates data by special LOD functions.
VR Mesh Reverse enables users measure the basic items such as road design and allocation of objects with high accuracy. VR Mesh Reverse individualizes the necessary range for high PC performance. In addition, with the high capability of VR Mesh Reverse that can handle 17,000,000 coordinates simultaneously, users can understand the way data is to be created by seeing data as point cloud.

●Work items and required time frame (Umi-Hotaru project)

As well as the import of point cloud data, Point Cloud Data Plug-in option has many more features. This option enables you to import point cloud data obtained using surveying tools, such as laser scanner, into the 3D VR software and display the imported data at a specified position.
To convert the terrain data, TIN data is generated from the laser-scanned point cloud data and then terrain patch function can be used to model the terrain.
Repositioning of the point cloud data is possible by moving the point clouds sideways or rotating them.
For exporting data, you can export point cloud data to Land XML data, so that the generated data can be used on other systems.

▲Point cloud data import

▲Import and drawing of point cloud data

▲Point cloud drawing option

▲Generation of terrain TIN data, terrain modeling

▲Position adjustment of
point cloud data

VR Mesh Function which is indispensable for using millions of point cloud data.
VR Mesh Reverse ：　Price $695.00US　Virtual Grid (http://www.vrmesh.com/products/reverse.asp)

▲LOD function using 17,000,000point cloud data

▲Expresses one part by Window Clip

▲Measuring point cloud data information by using the UC-won/Road data creation functions.

By selecting "Analyze", measurement begins.
Later, select Measure Distance and click 2 point clouds of the data to measure the distance.
By retaining the previous measurement, users can measure the point clouds.
However, it takes sometime to get accustomed to, because the tool to assess the different coordinate planes.

Conducted the road alignment and definition of the section, referring to the point cloud data. Finished VR model will be a highly accurate structure model. It can be used for It can be used with generated traffic, as a VR model which is used in the event of presentations and discussion.

▲Definition of road alignment

▲Definition of vertical alignment

▲Definition of section

▲Road is generated in a moment. (initial model)
Generating traffic, users can simulate it at once.

▲Data with added buildings and road belongings

We recommend...

1. Utilization of Point cloud data as reference data to create road on UC-win/Road
   You can use it as an after-MMS processing tool or VR modeling tool to integrate with mobile mapping systems


2. Utilization of point cloud data as a reverse and difference analysis tool for UC-win/Road
   VR model and as a checking tool for VR models. For example, it can be used to guarantee the accuracy of the data and maintenance: gap analysis because of aging. We will propose the solution to meet your request and needs.

What is Mitsubishi Mobile Mapping System - High accuracy GPS mobile measurement system -

1. An integrated unit of 3 GPS antennas, IMU, camera and laser scanner is equipped on the top board. Since the equipment is adjusted in factory, eliminating the need of a complex vehicle outfit. 3 DPS's deployed in triangular shape capture position of the vehicle precisely.
2. Newly developed sensor box gives the time to retrieved data with 100usec resolution. The accuracy of data collection does not decline in case of high speed drive. BOX camera up to five units and laser scanner up to five can be connected.

Mitsubishi Electric's Mitsubishi Mobile Mapping System: High accuracy GPS mobile measurement system
http://www.mitsubishielectric.co.jp/pas/mms/

for survey

1. Making road map of present condition as the attached map of the road register
2. Editing point cloud to CAD data for management before and after construction

for making maps

1. Creation of basic data for creating 3D map
2. Check the adjacent roads

for road maintenance

1. You can identify the location of pedestrian crossings and surface markers as well as three-dimensional objects such as signs, utility poles, traffic signals and curbs by using photos.

▼Measuring the position of the object with laser scanners and cameras, precise 3-dimensional map in urban areas is easily created.