Estimating Crop ET from Satellite Section 2. Calculate ET from Satellite Data-V1.
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Transcript of Estimating Crop ET from Satellite Section 2. Calculate ET from Satellite Data-V1.
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Estimating Crop ET from SatelliteSection 2. Calculate ET from Satellite Data-V1
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Outline• Calculate dT at hot and cold spots
Choose area of interest Locate a cold spot and find the surface temperatureLocate a hot spot and find the surface temperatureFind the local weather dataCalculate dT
• Calculate ETObtain daily Etr
Download the file “CalculateEt.xls”
Calculate the following
NDVI (Normalized vegetation index)
Ln(Zom) (the natural logarithm of roughness length)
H (soil heat flux)
Albedo (ground reflectance)
ET
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Step 2Drag mouse to choose an interested area
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Step 3Put mouse at the upper-left corner of the chosen area to
obtain coordinates
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Step 4Put mouse at the bottom-right corner of the chosen area to
obtain coordinates
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The green circled areas are pecan orchard and alfalfa field
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Step 5Adjust the coordinates
Upper-left corner (from step 3)
4104/6=684 do not need to be adjusted
821/6=136.8 adjusted to 137*6=822
Bottom-right corner (from step 4)
4315/6=719.1 adjusted to 719*6-1=4313
993/6=165.5 adjusted to 166*6-1=995
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Choose area of interest
step1Open the “Image3N” image in the file of
“AST_L1B_003_09042002175822_01142003061252.hdf”
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Step 6Show the interested area only
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Step 7Press the “Magnifier” to magnify the image to
find the Salopek pecan orchard
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Step 8 put the mouse in the the orchard to find the coordinates
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Using the same way to find a point coordinates in the alfalfa field for future locating NDVI
(slide 53)
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Step 9 open “Kinetic Temperature” in “AST_08_003090420021758220000000.hdf”
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Step 10 choose the interested area of upper-left (684, 137) and bottom-right (718,165) (see step 5)
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Step 11 find the point coordinates in pecan orchard
According to step 8 and the point coordinates in the pecan field are (24, 18) in the “ImageData3N” chosen area, and
according to step 10, the starting coordinates of the upper-left coordinates in the chosen temperature image are (684, 137).
So the point coordinates are684+24 /6~688137+18/6~140
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Step 12 find the pecan orchard temperature (688, 140) in the chosen area spreadsheet.
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Locate a bare soil field and find its temperatureStep 1 open the chosen surface area as an image
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Step 2 magnify the image by click on “Magnifier”
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Step 3 find the hottest point (assume it is a bare soil field)
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Find the local weather dataStep 1 go to:http://weather.nmsu.edu/cgi-shl/cns/stninfo.pl?stn=95
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Step 2 Scroll down and click on “2002” in “Old hourly data”
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Step 3 The hourly data in 2002 is shown. Please record which columns are “Humidity Mean”, “Wind Speed Mean”, and “Solar Radiation Mean”
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Step 4 Scroll down and find the data at 12:00, 09/04/02
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Step 5 Scroll to right and find the needed data “Humidity Mean=28.19%”, “Wind Speed Mean=5.4 mph”, and “Solar Radiation Mean=28.86 L/h”
using the recorded column positions in step 3.
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Calculate dTStep 1
Download the Excel “DTSep0420021200.xls” file at:
http://weather.nmsu.edu/teaching_Material/soil470/sebal/Etcalculation/DTSep0420021200.xls
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Step 2
Open “DTSep0420021200.xls” and input the obtained data.
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The worksheet of “ETr calculation” worksheet calculates hourly Etr
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The “Bare soil spot” worksheet calculates hot spot dT
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The “dT graph” worksheet shows the linear equation for dT calculation
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Calculate ETObtain Daily Etr
Step 1 Go to
http://weather.nmsu.edu/cgi-shl/cns/oldformat.pl
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Step 2 fill out the date, choose “Metric (Excel)”, then fill in “ID” finally press “Retrieve Weather Data”
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Then the Etr (PET) is calculated.
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Download “CalculateEt.xls” Step 1
In Internet Explorer fill in the following URLhttp://weather.nmsu.edu/teaching_Material/soil470/sebal/ETCalculation/calculateEt.xls Then click “Yes”
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Step 2 click No
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Step 3 Click on “File“ then“Save As”
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Step 4 Click on “File“ then“Save As” and give a file name and then “Save”
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Calculate NDVIStep 1 close the Internet Explorer so that
the Excel software can open the dowloaded file.
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Step 2 open Excel software and click “File” then “Open”
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Step 3 choose the file and click “Open”
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Step 4 click “Enable Macros”
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Step 5 click “No” if the following dialog appears
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Step 6 fill in the input values
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Step 7 go to the opened “AST_L1B…” HDF file and copy the chosen area “ImageData3N” data.
upper-left (4104, 822) and bottom-right (4313, 995). See slide 9
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Step 8 go to “Band3” Excel worksheet and paste the copied data
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Step 9 using the same way copy the HDF “ImageData 2” data to “Band2” worksheet.
upper-left (4104, 822) and bottom-right (4313, 995).
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The “NDVI 15by 15” worksheet automatically
calculates the NDVI in 15 by 15 m resolution
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Step 10 click “Tools”, “Macro”, “Visual Basic Editor”
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Step 11 click “Windows”, then “Module 1”
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Step 12 click the “run” button to calculate the 90 by 90 m NDVI
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Within 1 minute, the calculation finished and the results are in
“NDVI 90 by 90”
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Calculate Ln(Zom)Step 1 find point (24, 21) in “NDVI 90 By90” and
obtain the NDVI for bare soil according to coordinates (23, 20) from slide 19
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Step 2 find point (24/6+1, 18/3+1) in “NDVI 90 By90” and obtain the NDVI for pecan according to
coordinates (24,18) from slide 11
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Step 3 find the point (120/6+1, 131/6+1), i.e. (21, 22) and obtain NDVI for alfalfa
according to slide 12 coordinates (120,131)
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Step 4 input the NDVIs and pecan alfalfa heights and
bare soil roughness length in “NDVI LNZom” to obtain the regression equation for Ln(Zom)
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Step 5 in “LnZom”, calculate Ln(zom) for each point using the regression equation
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Calculate HStep 1 copy the chosen surface temperature data
from HDF file (slide 14) to the Excel “temperature “
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The “Iteration” worksheet will automatically do iterative H calculation considering stability effects
until most H’s change within 10%
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Albedo calculationstep 1 open the reflectance file
” AST_07_003090420021758220030000.hdf1”Must choose “All Files” on the dialog, otherwise, the file will not be
shown.
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The opened file
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Step 2 choose data area, the upper left coordinates are (2052, 411) and bottom-right (2156, 497)
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Step 3 copy chosen area Band 9 data from HDF file to “Reflectance 9” of Excel file.
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Step 4 using the same way copy the reflectance data of band 5, 6, 8 to the Excel worksheets of
“Reflectance 5, 6, 8” respectively
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The part of albedo calculation for band 5, 6, 8, and 9 in the albedo regression equation will
be automatically calculated in “Reflectance 5 6 8 9 30by30m”
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Step 5 Open the reflectance file of AST_07_003090420021758220030000.hdf0
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Step 6 Copy the “Band3N” and “Band2” reflectance data from HDF file to Excel worksheets of “Reflectance 3n” and “Reflectance 1”. The upper-left coordinates are (4104, 822)
and bottom-right (4313, 995)
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The part of albedo calculation for band 1, and 3 in the albedo regression equation will be
automatically calculated in “Reflectance 1 3 15by 15m”
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Step 7 Open Visual Basic Editor to run the modules to convert the resulted 30 by 30 m and 15 by 15 m
albedo calculation to 90 by 90 m
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Step 8 click “Tools”, then “Macros”
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Step 9 click “Reflectance13Band15to90m” and then “Run” to covert 15 m by 15 m results to 90 by 90 m
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Step 10 click “Reflectance5689Band30to90m” and then “Run” to covert 30 m by 30 m results to 90 by
90 m
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The results for band 5, 6, 8, and 9 in 90 by 90 m resolution are in the worksheet of “Reflectance 5 6 8
9 90by90m”
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The results for band 1 and 3 are in the worksheet of “Reflectance 1 3 90by90m”
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The final albedo is automatically calculated and is in “Albedo” worksheet.
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ET calculation and visualizationStep 1The net radiation is automatically calculated
in “Radiation net”
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The regression equation for G/Rn is obtained in “G Div regression”
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Step 2 The G/Rn is calculated in “G Div Rn” G is soil heat flux and Rn is the net radiationusing the regression equation from last slide.
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Step 3 Rn-G is obtained in the worksheet of “Rn-G”
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Step 4 Et is calculated in “ET”
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Step 5 Scroll down and then the Et is calculated in “mm/day”
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Step 6 Scroll down, and then the Et is rounded to integer because to visualize it in HDFView2.1, the format must be
integer.
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Step 7 The ET results are visualized in HDFView2.1