ASD FieldSpec 3 - Page 5

ASD Document 600540 Rev. J v FieldSpec® 3 User Manual
www.asdi.com
Appendix B Reference Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Frequently Asked Questions (FAQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
What is a spectroradiometer?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
What are the differences between the ASD spectrometers? . . . . . . . . . 80
What is remote sensing? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
How often do I need to optimize? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
How often do I need a (baseline) White Reference? . . . . . . . . . . . . . . . 81
What spectrum average (or sample count) should I use? . . . . . . . . . . . 81
What if I want to keep the same settings all day? . . . . . . . . . . . . . . . . . 82
When do I use absolute reflectance? . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
How do I know the field-of-view that I’m using? . . . . . . . . . . . . . . . . . . . 82
What are the units of radiance? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Can I post-process my data? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Why do I see oscillations (sine wave) in my data? . . . . . . . . . . . . . . . . . 84
What are these two large noise bands in my data? . . . . . . . . . . . . . . . . 84
What are these upward or downward spikes in VNIR data? . . . . . . . . . 85
What are these steps in my data? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
What can cause more noise in my data from last time? . . . . . . . . . . . . . 86
Why does the VNIR drop to zero after a Dark Current collection? . . . . . 86
How do I collect a reference with a spot size larger than the Spectralon
panel? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
How do I set up GPS? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
What does a broken fiber mean? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
How long is the battery life? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
What type of Ethernet cable can I use for the static IP configuration? . . 89
Can I install additional software on the instrument controller? . . . . . . . . 89
Why does the software seem to do unexpected things? . . . . . . . . . . . . 89
How long does it take for the FieldSpec spectroradiometer to warm up? 90
Where is my serial number?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Data Conversion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Gain and Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Light Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Optimization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Spectral Discontinuities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Field-of-View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
White Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Other Tips on Discontinuities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Spectrum Averaging (or Sample Count). . . . . . . . . . . . . . . . . . . . . . . . . . . . 93