Wednesday, September 22, 2010

Get the Point Cloud

In Taiwan, I really hard to get Point Cloud data set free. For test, I found I can get some data set from Open Topography (http://www.opentopography.org/).
Here is the metadata got from Open Topography. (it is around Napa where I had been visited a great restaurant, GrayStone).

The greatest thing for me is it clearly describes coordination:

Horizontal Coordinates: UTM Zone 10 N NAD83 Meters
Vertical Coordinates: Geoid89
...

Data Selection Coordinates:
Xmin: 531159.776
Xmax: 534629.345
Ymin: 4272683.453
Ymax: 4280409.657
Classifications: All

Base on Horizontal and Vertical Coordinates, I can query from Oracle Coordinates references table and decides which SRID I should choose.


So we got to choose SRID = 26910

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