Importing 3D map tiles from HK lands department

[feklee]

The Hong Kong lands department provides 3D scans of parts of the region in the form of 3D tiles. The tiles that I tested have a side length of, if I recall correctly, 150m. Their position is absolute. So if you import two adjacent tiles, they will be positioned next to each other. I tried that in Rhino. However, with Blender, I don’t manage to import the tiles. They show up as a dot. A friend had success by scaling by a factor of 0.00001.

What is the correct way to import this data?

Finding the tiles is a bit tricky:

1. Open the search panel: https://portal.csdi.gov.hk/geoportal/#searchPanel

2. Go to page 8.

   

3. Open: 3D Visualisation Map (Tile-based models)

   

4. Click on: Data / Preview

5. Zoom in and select the quadrant you want.

   

6. Chose your desired format, e.g.: Format_OBJ

[Okidoki]

I once played with this… the only thing you have to do is to choose a correct Z-up…

You might missinterpret this as a dot when comparing the 151 (!! ) m square tile to the standard scene 2m cube in the center…

You have to move your camera to the absolute position of the the data tile… and a neighbour tile will fit/match perfectly:

Edit: …also scaling by

@feklee

0.00001

would make it even smaller …without it has a X and Y dimension of 151m (you might want to apply rotation).

[feklee]

Thanks, I’m such a n00b! (really, I barely know how to navigate in Blender)

What I tried now, just to make it visible:

1. Import .obj with z-axis up.

2. Select the tile.

3. Select from the layout menu: View / Frame Selected

This works beautifully.