On August 5th, 15th ,and 17th , 2012, TRSI collected hyperspectral, LiDAR and digital image data in four project sites at and near Calvert Island, B.C. using a fixed wing aircraft with LiDAR system and a hyperspectral sensor. A combined GPS/INS System (Inertial Navigation System) was used for aircraft altitude and position. A total of 477.22 km^2 was covered on this mission with a flight height of 1150 meters above ground level (AGL) aiming to obtain 1.5 metre spatial resolution for hyperspectral Imagery.
The hyperspectral imagery was delivered as a set of 94 long and narrow swath “scenes” with each corresponding roughly to an individual flight line (from a grid pattern flight mission). In this fashion the dimensions and orientation varies somewhat from scene to scene. Predominantly there are North-South and West-East scenes which cover the length and width of Calvert and Hecate Islands and a portion of the mainland to the north. There is an inconsistent overlap between scenes in some cases; in others the imagery aligns at the seams or with a small gap in between. While details pertaining to post-processing performed on the imagery by the contractor are lacking, based on analysis the following assumptions have been made:
• The imagery has been georectified (the DEM used is unknown).
• The imagery has been radiometrically corrected to some degree although there is evidence that only a few calibrations files were used inconsistently for all scenes during radiometric correction, and overlapping areas between scenes have sometimes large variations in radiance pixel values of the same features on the same band.
• No atmospheric correction has been performed on the imagery.
The technical specifications for all scenes are the following:
Raster format: ENVI .dat files
Raster type: 16 bit unsigned integer
Projection: UTM Zone 9
Datum: NAD 83
Geoid: HT 2.0
Sensor platform: AISA Hyperspectral unspecified model sensor.
Flying Height: 1150m AGL
Frame Rate: 43 FPS
Spatial Resolution: 2m
Horizontal accuracy: +/- 2 pixel
Spectral range: 392 – 996nm
No. of Bands per scene: 132
Spectral resolution: ~4.25nm
Pixel values represent radiance in (mw/cm^2strum)* 100
NoData Value = 0.
Table of band spectral coverage
Band # Wavelength (nm)
1 392.730011
2 396.980011
3 401.220001
4 405.470001
5 409.720001
6 413.970001
7 418.220001
8 422.459991
9 426.709991
10 430.959991
11 435.220001
12 439.630005
13 444.079987
14 448.540009
15 452.98999
16 457.450012
17 461.899994
18 466.350006
19 470.809998
20 475.26001
21 479.720001
22 484.170013
23 488.630005
24 493.079987
25 497.529999
26 501.98999
27 506.440002
28 510.899994
29 515.349976
30 519.799988
31 524.26001
32 528.710022
33 533.169983
34 537.619995
35 542.070007
36 546.559998
37 551.169983
38 555.789978
39 560.409973
40 565.030029
41 569.650024
42 574.27002
43 578.890015
44 583.51001
45 588.140015
46 592.76001
47 597.380005
48 602
49 606.619995
50 611.23999
51 615.859985
52 620.47998
53 625.109985
54 629.72998
55 634.349976
56 638.969971
57 643.590027
58 648.210022
59 652.830017
60 657.460022
61 662.080017
62 666.700012
63 671.320007
64 675.940002
65 680.570007
66 685.190002
67 689.809998
68 694.429993
69 699.059998
70 703.710022
71 708.349976
72 713
73 717.640015
74 722.289978
75 726.929993
76 731.580017
77 736.219971
78 740.859985
79 745.51001
80 750.159973
81 754.880005
82 759.609985
83 764.340027
84 769.070007
85 773.799988
86 778.530029
87 783.26001
88 787.98999
89 792.719971
90 797.450012
91 802.179993
92 806.909973
93 811.640015
94 816.369995
95 821.099976
96 825.830017
97 830.549988
98 835.27002
99 839.98999
100 844.710022
101 849.429993
102 854.150024
103 858.869995
104 863.590027
105 868.309998
106 873.030029
107 877.75
108 882.469971
109 887.190002
110 891.900024
111 896.619995
112 901.340027
113 906.059998
114 910.780029
115 915.51001
116 920.25
117 924.97998
118 929.719971
119 934.460022
120 939.190002
121 943.929993
122 948.659973
123 953.400024
124 958.130005
125 962.869995
126 967.599976
127 972.340027
128 977.080017
129 981.809998
130 986.549988
131 991.280029
132 996.02002
Due to weather and time constraints faced by the contractor, several small data gaps exist within the project boundary. Additionally systematic small rectangular data gaps within many scenes are present (these are unrelated and additional to those due to “weather and time constraints” stated by the contractor).
