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
- 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'
- 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
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.
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.
Revision: r1.1 - 31 Dec 2008 - 17:39 - Main.guest