Test Sites

All downloads below are archived in ZIP format. To extract these archives, you must have WinZip or similar installed on your system.

Summary of sites

Location

Site(s)

Data

@ Planimetric Resolutions of ...

 City

  Site 1

[X1, Y1, Z1, I1, X2, Y2, Z2, I2]

  • 0.67 points per square metre (point spacing: 1.0 - 1.5m)
  • 0.18 points per square metre (point spacing: 2.0 - 3.5m)
  • 0.04 points per square metre (point spacing: 4.0 - 6.0m)

  Site 2

  Site 3

  Site 4

[X1, Y1, Z1, I1, X2, Y2, Z2, I2]

  • 0.67 points per square metre (point spacing: 1.0 - 1.5m)

 Forest

  Site 5

  Site 6

  Site 7

[X1, Y1, Z1, I1, X2, Y2, Z2, I2] 

  • 0.18 points per square metre (point spacing: 2.0 - 3.5m)

  Site 8

[X1, Y1, Z1, I1, X2, Y2, Z2, I2]

  • 0.18 points per square metre (point spacing: 2.0 - 3.5m)
  • 0.05 points per square metre (point spacing: 4.0 - 5.5m)
  • 0.01 points per square metre (point spacing: 7.0 - 10.0m)

Eight sites have been chosen for comparing the performance of filters. Four represent urban landscapes (City Sites ) and the other four represent rural landscapes (Forest Sites ). The point density for the City and Forest sites are roughly 0.67 and 0.18 points per square metre respectively. Associated with each Site is one zip file, except for Sites 1 and 8 which have two extra zip files each. Each zip file contains one text file. Each text file represents first and last pulse returns.

Sites 1 and 8 as mentioned above have associated with them two extra zip files. The data in the extra zip files are the same except in resolution (lower resolution). The lower resolution data was obtained by selecting the Nth point along the Nth scanline. In this way the original data was reduced for N = 2 and N = 4.

For Site 1 the reduction gives a point density of roughly 0.18 and 0.04 for N = 2 and N = 4 respectively. Also for Site 8 the reduction gives a point density of roughly 0.05 and 0.01 for N = 2 and N = 4 respectively.

The suffix (last three letters) in the name of each file indicates the resolution of the data it contains. The suffixes are _orig, _red1, and _red2. They stand for Original, Reduction by 1 (N = 2), and Reduction by 2 (N = 4) respectively. For example, file CSite1_red1.txt is a reduction of the original data by keeping only the 2nd point along the 2nd scanline.

Each text file is a space delimited point list. Every record represents two points (first and last return) and four data items are provided for each point in the record:

Sample:

    ...
    ...
    ...
    495246.77 5420160.76 251.33 192 495246.77 5420160.78 251.25 192
    495246.73 5420163.65 251.26 193 495246.73 5420163.66 251.20 193
    495246.69 5420166.65 251.31 290 495246.69 5420166.65 251.31 290
    495246.65 5420169.67 251.32 192 495246.65 5420169.68 251.27 192
    495246.61 5420172.70 251.29 290 495246.61 5420172.71 251.23 290
    495246.57 5420175.73 251.27 290 495246.57 5420175.73 251.23 290
    495246.53 5420178.63 251.22 290 495246.53 5420178.64 251.15 290
    495246.49 5420181.52 251.23 319 495246.49 5420181.53 251.18 319
    495246.45 5420184.68 251.33 348 495246.45 5420184.68 251.34 348
    495246.41 5420187.73 251.31 290 495246.41 5420187.73 251.29 290
    ...
    ...
    ...

City sites

Site

Data Bounds

3D View


Site 1

  X min

512050  

 

  Y min

5403440  

  X max

513150  

  Y max

5404100  

  Original - (11.1 MB)

Download

  Reduction (1) - (4.4 MB)

Download

  Reduction (2) - (1.1 MB)

Download

  All - (16.6 MB)

Download

Features of interest:

  • Steep slopes
  • Mixture of vegetation and buildings on hillside
  • Buildings on hillside
  • Data gaps

Site 2

  X min

513450  

 

  Y min

5402650  

  X max

513870  

  Y max

5403280  

  Original - (3.8 MB)

Download

Features of interest:

  • Large buildings
  • Irregularly shaped buildings
  • Road with bridge and small tunnel
  • Data gaps

Site 3

  X min

512023  

 

  Y min

5403120  

  X max

512549  

  Y max

5403500  

  Original - (3.1 MB)

Download

Features of interest:

  • Densely packed buildings with vegetation between them
  • Building with eccentric roof (bottom left corner)
  • Open space with mixture of low and high features
  • Data gaps

Site 4

  X min

513120  

 

  Y min

5403190  

  X max

513630  

  Y max

5403760  

  Original - (4.0 MB)

Download

Features of interest:

  • Railway station with trains (low density of terrain points)
  • Data gaps


Forest sites

 

Site

Data Bounds

3D View


Site 5

  X min

493650  

 

  Y min

5419770  

  X max

495250  

  Y max

5421000  

  Original - (5.5 MB)

Download

  Image (tif file) - (4.2 MB)

Download

Features of interest:

  • Steep slopes with vegetation
  • Quarry
  • Vegetation on river bank
  • Data gaps

Site 6

  X min

496350  

 

  Y min

5420750  

  X max

497950  

  Y max

5421817  

  Original - (4.7 MB)

Download

Features of interest:

  • Large buildings
  • Road with embankment
  • Data gaps

Site 7

  X min

495950  

 

  Y min

5421350  

  X max

497200  

  Y max

5422380  

  Original - (3.4 MB)

Download

Features of interest:

  • Bridge
  • Underpass
  • Road with embankments
  • Data gaps

Site 8

  X min

499450  

 

  Y min

5418330  

  X max

500550  

  Y max

5419430  

  Original - (3.0 MB)

Download

  Reduction (1) - (0.8 MB)

Download

  Reduction (2) - (0.2 MB)

Download

  All - (4.0 MB)

Download

Features of interest:

  • High bridge (diagonal left to right)
  • Breakline (Bottom center)
  • Vegetation on river bank
  • Data gaps

 

Reference data

For each of the samples that have been used for analysing the filtering results of the test participants the reference data is now available. This reference data has been compiled by semi-automatic filtering and manual editing. Each record in the reference data files contains the X, Y, and Z coordinates followed by either a 0 (ground point) or 1 (non-ground point).