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Month: March 2017

Multipatches, Point Clouds and Meshes

Multipatches, Point Clouds and Meshes

This is our first post from Nicholas Duggan (@dragons8mycat) who writes for xyHt, this article is also posted there.

A Guide to 3D GIS Data Formats

Moving your GIS to 3D is a daunting task. Not only are there all the vertical issues to take into account, but also a whole new world of jargon, which can, at times, be quite overwhelming.   In this post you’ll find a few of the data formats that are most commonly used.

Point Clouds

Also called: multipoints, lidar, multibeam, singlebeam, xyz data, laserscan

Point Clouds

No, these aren’t an awesome punctuation weather dictator, and unless you are using some Kenneth Field colour ramp, you are unlikely to see a rainbow. Point clouds are point data that are vertically enabled (commonly called “z- enabled”).

Typically, when using point clouds within GIS, one would be referring to lidar, multibeam or xyz data whereby there may be multiple points sitting on the same vertical as well as horizontal plane.

Within 2D GIS, point clouds are used as a “heighted raster” where each cell would have the value of the height. The value of using this form of data within a 3D GIS is that the data can be geographically represented in a 3D space so that the information can be viewed rapidly and alongside other risks and issues.

Mesh

Mesh

In the geospatial world, a mesh refers to a 3D image overlay. They’re similar to a TIN; you will have commonly seen these within Google Earth, those buildings that have the uncanny valley effect: they are just a little bit wobbly and the trees appear to be all fused together, but it gives a really nice 3D effect (from a distance). That is a mesh.Within the geo-3D world there are meshes, and there are meshes. I know, we like to keep everyone on their toes, but in reality it is the CAD guys you need to be sore at. Within the CAD world, a “mesh” is a triangulated model, the kind you find in Google SketchUp or you’d print at your local 3D print shop (see Multipatch, below). In the GIS world, we refer to this as a “model.”

Normally these meshes are derived from point clouds, or they can be generated from georeferenced imagery in software like Pix4D.

Popular in gaming, meshes are starting to appear in GIS thanks to software like Google Earth and Cesium.

Polygon Z

Polygon z

This form of data takes the standard 2D topographic data and then “extrudes” it vertically, making it appear like a solid 3D object. This technique is popular for generating mass buildings or creating 3D background information for visualisation. The method is popular due to it being so easy to achieve with the 2D data, which is already used within the software. The only further requirement is a height (to extrude the footprint/data to).Also called: Extruded footprints, heighted footprints

Although this data doesn’t incorporate vast amount of detail, such as windows, roofs, and chimneys on buildings, for example, it does provide a much more accurate visibility analysis and 3D skyline analysis.

The UK’s national mapping agency, the Ordnance Survey, provides its definitive (1:1250) data product, OS Mastermap, in this format and so do some of Open Streetmap as well as GeoInformation Group.

Multipatch

Multipatch

The multipatch, according to Esri, was developed by them in 1997. While I let many learned people fight over that statement, the most popular example of a multipatch is the 3D Buildings found in Google Earth (an example is at the very top of this article) or the kmz models which are generated from Google SketchUp. They are a type of geometry consisting of planar three-dimensional rings and triangles, used in combination to model objects that occupy a discrete area or volume in three-dimensional space. Unlike the “polygon Z,” the multipatch can be complex and have multiple smaller parts to make the whole so are frequently used for representing trees, buildings and street furniture.Also known as: model, mesh

Due to breakthroughs in quadtree, octree and other rendering techniques, the multipatch has gained popularity as massive models comprising of entire cities can be created and presented through the web.

 

“The Barriers to Building 3D Synthetic Environments” at the Transport Systems Catapult

“The Barriers to Building 3D Synthetic Environments” at the Transport Systems Catapult

Last week I attended and presented on behalf of Garsdale Design at the Transport Systems Catapult (TSC) 3D cities event in a foggy Milton Keynes.   This was a “one day opportunity to collaboratively identify challenges and showcase solutions” and “gain insight into virtual/synthetic testing for transport”.

TSC have been having a conversation with us about modelling 3D urban environments using procedural  technologies found in Esri CityEngine and integrating those models in Unity.    I have to be honest though, I was initially concerned about focusing on this negative idea of ‘barriers’ as all we see is opportunities here at Garsdale Design!  However, here was a gathering of people from a variety of industries who understood what it meant to actually make 3D city models and use them in commercial contexts. 

Presentations

The session had some key aims, firstly to understand what a variety of people were doing to create 3D cities, secondly to discuss some the hurdles or barriers of city creation (and publication) and lastly to have ‘round-table’ discussions to identify some of these barriers and how we might overcome them.   Have a look at who came and presented and you can see we had some very interesting presentations!

  1. Transport Systems Catapult : TSC current projects
  2. Future Cities Catapult : Use of environments for smart cities
  3. Satellite Applications Catapult : Satellite
  4. Mantle: Creation of game ready content from GIS data
  5. ESRI : 3D GIS
  6. Leica Geo Systems : Technology behind 3d Lidar Environments
  7. MK Surveys : Creation of 3d Lidar Environments
  8. Garsdale Design : The Art & Science of 3d Cities
  9. UCL : Intelligent positioning within 3d environments
  10. Rust Ltd : Creation of AAA quality game environments
  11. Imsim : Autonomous vehicle fleet management

The event started with an overview of who they were and what Transport Systems Catapult were working on and with.   Catapults as I see them are there to fill the void where companies like ourselves can’t explore or experiment with technologies.  With the best will in the world Garsdale Design hasn’t got unlimited resources to ‘play’ with all the exciting new technologies coming through! 

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