辅导 GEOG5099 – Applied Land Survey辅导 Web开发

Geomatics MSc & CPD Programmes

Aims

Develop students’ knowledge of laser scanning and introduce point cloud processing. Provide an opportunity to use the latest survey equipment.

Learning outcomes

Having completed this exercise, students will be able to:

•    Plan and execute a laser scanning project from reconnaissance to final 3ddeliverable.

Exercise Background

Having completed the various tutorials and working examples from the databases provided, students should have sufficient knowledge to commence working with a set of scans to produce a 3D model of your own scanned data.

Exercise Overview

Planning/Reconnaissance & Fieldwork

Select suitable object(s)/area to scan. In your group, decide on number and location of instrument  setups. Perform. your data collection with the laser scanner. Each group will have an assigned ‘data controller / documenter’ to ensure key data, photos, videos, sketches etc are collected onsite and  issued to any remote group members.

Processing

Individually process data and write report. Everyone will be issued their data after each group has performed the data collection. Commence processing – registration in Register 360 and modelling in 3DR and report writing.

Processing / Reporting & Issue

Individuals finish processing, reporting and submit work.

Exercise Instructions & What is Expected of You

After group data collection each person will be able to access their own data which should be imported to a new project of your own.

If you used the ‘traverse’ method of scanning in the field, your scans should already be registered together. If using registration in field tools, then registration can be performed again / finalised in office. Comparisons between any registration techniques can also be made. You will need to complete the Regiser360 process regardless to perform. any checks, generate QC report and take any screenshots.

Modelling:

Once you are happy with the registration, and originalscan data has been cleaned of unwanted artefacts, you should attempt to model your data to create a good 3D representation of your object/area.

Modelling can be performed in various ways e.g. patches or using meshes – you will need to experiment to see what provides the best results for your objects / environments.

You can use mesh functions and drape a texture/image over the mesh. If you use this method, you should attempt to fill any gaps caused by ‘scanning shadows’ etc.

You should use patches and geometric objects to create a good model of your object/area where possible. Note some new features will be available within updated software.

Report

Each student should submit a short, illustrated report - summarising the main processes and success/shortcomings of their modelling attempts - no longer than 2 (A4) pages (including images) - submit via Moodle. In your report you should state explicitly which model space view/similar contains the finished product

The report should highlight the recce/collection, registration and modelling performed on project. Discussion of issues, encountered, quality (with respect to survey and visual aspects) of final products. Key aspects of registration report should be highlighted / referenced in your own written  report but do not replicate everything- I will be looking at both. Max report length 2 pages (font size 12) References can go on a page 3. No Appendix.

Data Submission:

As above – 2 pdf files to moodle and 1 data zip via file transfer protocol.  I need a zip file (zip or 7z) of your complete project file out from 3DR.

The 3DR project output should be submitted using the University’s file transfer service.

https://transfer.gla.ac.uk/Use the ‘drop off’ service to send to william.kelly@glasgow.ac.uk

Data storage

It is important that you each work on your own set of data, so it would be sensible to make a folder on the local drive of the PC you select and work from there. DO NOT LEAVE YOUR DATA ON THE PC when you are not working there. MOVE IT TO YOUR HOME SPACE or ONTO A PERSONAL DRIVE (and make your own backup copy) so that others cannot interfere with your work. Copy it back to the local drive for continued work. Alternatively work from a suitable personal hard disk attached to the PC. Remember to have a backup of your work.