CALMIT Field Program. Center for Advanced Land Management Information Technologies (CALMIT) University of Nebraska Lincoln

Transcription

1 CALMIT Field Program Center for Advanced Land Management Information Technologies (CALMIT) University of Nebraska Lincoln

2 Field Program: Three Areas Agriculture Surface Waters Coastal / Marine

3 1) Agriculture Biophysical Measurements: Vegetation Fraction Leaf Area Pigment Type and Density Leaf-Water Content Primary Productivity / Biomass Absorbed Photosynthetically Active Radiation

4 CALMIT Field Facility Note aircraft-calibration targets on concrete strip (above)

5 Goliath

6 Goliath Specifications All terrain (tracked wheels) Boom height = 10.5m (with full rotation) Boom length = 3.8m stowed; 12m extended Platform height = approx. 2m Platform width = 2.6 x 3m Passengers = driver + 4 Wheel spacing for standard 76.2 cm (30- inch) rows

7 Goliath is Mobile

8 Spectroradiometers Available on Goliath Dual Spectron SE-590 s Dual Ocean Optics USB-2000 s ASD-FR

9 Spectroradiometers Spectron SE-590 (2) 256 channels; nm

10 Spectroradiometers ASD Field Spec - FR (2) 2150 channels; nm

11 Spectroradiometers Ocean Optics USB2000 (4) 2048 Channels, nm Dual systems allow simultaneous capture of downwelling (sky) irradiance and upwelling (target) radiance

12 Dual Fibers Facilitate Data Collection Under Rapidly Changing Illumination Conditions

13 Other Sensors on Goliath Canon digital-video camera Linear Laboratories infrared thermometer P-band Radar Scatterometer

14 Vegetation Fraction: Digital Camera V8 (19 June) V12 (6 July) R2 (28 July) R5 (20 August)

15 Early Season 30 May 28, _194N-S 104-2_194N-S _194N-S _194N-S _194N- S Wavelength (nm)

16 Mid-Season 60 July 21, _194N-S 304-2_194N-S _194N-S 304-4_194N-S Wavelength (nm)

17 Late Season August 18, _194N-S 204-2_194N-S _194N-S _194N-S Wavelength (nm)

18 Estimating Vegetation Fraction 0.6 Vegetation Fraction-Estimated VARI R 2 = Vegetation Fraction-Measured

19 Other Systems on Goliath Real-time DGPS Wireless Internet

20 Other Field Instruments UniSpec 256 Channels, nm Leaf Clip Operates with internal light source

21 University of Nebraska Carbon Sequestration Program Project Study Teams: Micrometeorological (CO 2 and H 2 O Vapor Fluxes) Soil Water Balance Soil C Plant C Assimilation NO 2 and CH 4 Flux Leaf Level Remote Sensing Canopy Level Remote Sensing Technology Design & Adoption

22 Seasonal VARI Irrigated and Non-Irrigated Corn June 6 through September Irrigated Corn VARI Non-Irrigated Corn /29/0106/18/0107/08/0107/28/0108/17/0109/06/0109/26/0110/16/01 Date

23 Why Use Goliath? Reflectance, % July 3, Carbon 3 Measurements from Goliath Platform

24 Why Use Goliath? 8 6 July 3, Carbon-3. Handheld measurements

25 Hercules (2003 Field Season)

26 2) Surface Waters: Mesocosms

27

28 Surface Waters: Macrocosms

29 Underwater Light Fields

30 Okoboji Lakes (20 Sep 01) Reflectance, % mg/m Reflectance, % mg/m Wavelength, nm Wavelength, nm West Okoboji East Okoboji

31 Examples of Ancillary Data Sechi Disk Pigments» Chlorophyll» Carotenoids» Phycocyanin Phytoplankton Densities Turbidity Non-Organic Solids

32 Classified AISA Image

33 Coastal / Marine Roatan Island, Honduras

34 The Bob Technology

35 Remote Sensing of Corals

36 Video of Coral Features Scanned

37 Coral Spectra 100 SELECTED CLOSE RANGE SPECTRA ROATAN ISLAND, HONDURAS PERCENT REFLECTANCE Montastrea annularis 2 - Porites asteroides 3 - Acropora palmata 4 - Millepora complanta 5 - SAND BOTTTOM WAVELENGTH (nm)

38 Traditional Calibration

39 Dual Fibers Collecting spectra on a coral reef: Roatan Island, Honduras (March, 2002)

40 Using Dual Spectoradiometers for Hyperspectral Data Collection Land Lakes Underwater

41 Advantage Allows for data collection under most irradiance conditions Method is not valid if the irradiance changes during the scan time of the instruments (Usually 5 to 20 sec)

42 Hardware Requirements Two similar spectroradiometers

43 Hardware Requirements Two similar spectroradiometers Hemispherical cosine corrected optic

44 Hardware Requirements Two similar spectroradiometers Hemispherical cosine corrected optic Cables, power supplies, fibers, etc.

45 Hardware Requirements Two similar spectroradiometers Hemispherical cosine corrected optic Cables, power supplies, fibers, etc. Calibrated reflectance standard

46 Computer Additional Requirements

47 Additional Requirements Computer Spectral calibration of instruments

48 Additional Requirements Computer Spectral calibration of instruments Software for acquisition & processing

49 Additional Requirements Computer Spectral calibration of instruments Software for acquisition & processing Radiometric calibration optional Not necessary for reflectance Needed for radiance/irradiance

50 Method Near simultaneous data acquisition from both instruments Downwelling and upwelling radiation Instruments have different integration times

51 Method Near simultaneous data acquisition from both instruments Downwelling and upwelling radiation Instruments have different integration times Spectral channels of downwelling instrument interpolated To match channels of upwelling instrument

52 Method Near simultaneous data acquisition from both instruments Downwelling and upwelling radiation Instruments have different integration times Spectral channels of downwelling instrument interpolated To match channels of upwelling instrument Ratio of upwelling divided by downwelling is calculated

53 Method Near simultaneous data acquisition from both instruments Downwelling and upwelling radiation Instruments have different integration times Spectral channels of downwelling instrument interpolated To match channels of upwelling instrument Ratio of upwelling divided by downwelling is calculated Use scans of calibration panel to correct all other scans Panel reflectance is known A correction factor (CF) is calculated for each channel CF applied to upwelling/downwelling ratio of each scan

54 Corn & Soybeans May 21, % Reflectance Wavelength (nm) Allows calibration scans to be compared

55 Corn & Soybeans June 21, % Reflectance Wavelength (nm) Correction factors calculated for each channel based on the median value of the calibration scans for that channel

56 Corn & Soybeans July 23, % Reflectance Wavelength (nm) Correction factors applied to all scans

57 UNL Field-Radar System (EE Dept.)

58 Radar Measurements of Wetlands

59 Radar in the Field: Wetlands

60 Field Program: One Part of System

61