3D functions summary - TIN, DEM and so on

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Krisz
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3D functions summary - TIN, DEM and so on

Postby Krisz » Tue Feb 19, 2013 11:07 am

A brief summary about 3D functions

Collecting z coordinate:
You can save height, when you collect GNSS data
Prerequirement: you have to use DigiTerra map or Esri Shape file to use this feature
- When you creating new layers, do not forget checking "Storing 3D coordinates" checkbox
- The geometry will store height (z), too
- Optionally you can collect z coordinate to the datafield, if you add it on the Record panel

Height (z coordinate) means:
z = Height above ellipsoid and modifications:
+/- Geoidundulation (if you use it)
- GNSS antenna height (optional)
+/- GPS measurement panel up/down shift setting (optional)

See details here: viewtopic.php?f=59&t=308

Generate TIN (Trinagulated Irregular Network) panel:
- If you have simple word file with x, y, and z - this is the height coordinates (this can be a simple txt file, tab-delimited)
- Or you have z coordinates (height) in the geometry in map or shape file
- Or you have z coordinates (height) in your attributes
Just load into layers (layer panel, append layer) and you can built TIN model
In this panel you have option to skip items which has no heights

Append TIN layer, and operations with this layer
When you have TIN layer - this is a new layertype in Explorer 7 you can use it as a layer.
Using TIN layer as DEM (DEM = Digital Elevation Model)
- You can see the source panel (properties, min/max elevation, and so on)
- Or you can see the DEM options (double click, or "Classify" icon) - panel - this is the most interesting panel
You will find the max and min heights
You can colorize your DEM for height, slope, aspect, illumination
You can write into the heights in every trinagulation point
You can see the trinagulated network, and Thiessen lines too.

View in 3D command
This is a switcher icon, you can swith to 3D mode and 2D mode.
(The full map map view will be appears in 3D (all layer) - if the layers contains TIN layer.)
In 3D you can zoom/pan/rotate the camera - Use the i (information) tool from toolbar, and click
Zoom: mouse wheel, or panframe icons
Pan: Click+Drag or panframe icons
Shift + Click+Drag: rotation
The Plan view (Aeroplane) icon you can reset your rotations
To exit 3D view, click again on this icon

Notes:
TIN generation, and 3D availble just in PC
TIN and 3D module designed to normal-size TINs, if you would like to use very big dataset (millions of records, for example lidar) the program will run slowly)

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