Some files and images of the Ottawa data set, and a brief description of the file format for the point cloud. We are hoping to get images yet so that we can do the image registration tasks.

-- JackSnoeyink - 02 Jun 2008

Images

• Subset of the points in tile 148 shows overall structure:

sp_viewer -i 148.spb

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• All data points in tile 148 shows the structure of the building samples. Note detail in power lines.

sp_viewer -i 148.spb then press 'r'

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• Compressed streaming mesh with 1% of the points without filtering for structures like power lines or returns through or off windows shows the need to remove error points:

spdelaunay2d -i 148.spb -osmb | smsimp -n 2000000 -t 0.01 -ismb -osmb | sm_viewer -ismb

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OttawaDataNotes

Notes on where the files are at UNC

Data format description

Tiles are delivered in the format as described below.

typedef struct
{
  char signature[4]; // Signature of the file format (always UPCf)
  UCHAR versionMajor; // The major version number for the file
  UCHAR versionMinor; // The minor version number for the file
  USHORT headerSize; // Size of the header block
  unsigned __int64 numOfPts; // The number of points within the file
  double xScale; // The scale used in the x-coord
  double yScale; // The scale used in the y-coord
  double zScale; // The scale used in the z-coord
  double xOffset; // The offset used in the x-coord
  double yOffset; // The offset used in the y-coord
  double zOffset; // The offset used in the z-coord
} HEADER;

typedef struct
{
  double gpsTimeOfWeek; // The GPS time of week of the point
  char sensorNum[2]; // The laser sensor number used for the point
  char julianDay[3]; // The day the point was collected
  char flightLine[3]; // The flight line number of the point
  int x; // The recorded x-coord of the point
  int y; // The recorded y-coord of the point
  int z; // The recorded z-coord of the point
  UCHAR intensity; // The intensity of the point
  USHORT red; // The red component of the point
  USHORT green; // The green component of the point
  USHORT blue; // The blue component of the point
  char returnNum; // The return number of the point
}DATA_10;

MATLAB functions to read UPC

To get us going until we write a UPC reader, I've attached some MATLAB scripts that can read UPC files, albeit slowly.

• readUPC.m: read a limited number of lines from a UPC file.
• readUPChead.m: read the header of a UPC file

Links for Modules:

For more information on sp_viewer, sm_viewer, and other streaming modules, go to StreamingModules.

• saveUniqueOttawa.m: MATLAB script to save unique points in a set of tiles to .rawf format.

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