google earth engine app for residential water use and ... · g.e.a.r.u.p. google earth engine app...
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G.E.A.R.U.P. Google Earth Engine App for Residential Water Use and Preservation
Ayse Kilic – University of Nebraska -Professor, Member Landsat Science Team
Doruk Ozturk – University of Nebraska – Developer
Baburao Kamble, Ian Ratcliffe – University of Nebraska
Rick Allen -- University of Idaho – Professor, Member Landsat Science Team
David Thau, Tyler Erickson, Noel Gorelick, Google, Inc.
Rebecca Moore, Google, Inc. – Manager, Earth Engine / Visionary
Landsat Science Team Meeting – July 2015
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A Tool For Smarter Lawn Irrigation https://residentialwateruse.appspot.com/
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• Help homeowners manage water applications for
their lawn
• Designed for the whole CONUS
• Link to Beta version of App is at: https://residentialwateruse.appspot.com
• Link to You tube video that shows calibration of NAIP
with LANDSAT: https://www.youtube.com/watch?v=9aV8vduSTu0
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Googleplex -- NAIP Imagery Converted into
Evapotranspiration Map
Water Consumption NAIP
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Landsat NDVI
vs. NAIP NDVI
following
calibration
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How we calculate ET for lawn
Vegetation
INPUT OUTPUT
NAIP Landsat KL
Landscape
Coefficient (Kl)
Before
Calibration with
Landsat
Landscape
Coefficient (Kl)
After Calibration
with Landsat
NAIP = National Agriculture Imagery Program (1 m near-infrared)
NAIP imagery is available as Digital Number (DN), only.
We convert NAIP to reflectance using Landsat.
ET = KL x Reference ET
Reference ET represent
“near maximum ET
expected given the weather
conditions”
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Data flow for GEARUP App
Vegetation
INPUT OUTPUT
NAIP Landsat
Land-
scape
Coef.
(KL)
Weather RTMA NDFD
Refer-
ence
ET
Precip
ET
Hydrology Soil
Available
Water
Capacity
Soil Type Allow-
able
Dryness
Est.
Runoff
NAIP = National Agriculture Imagery Program (1 m near-infrared)
RTMA = Real-Time Mesocale Analysis Weather; NDFD = National Digital Forecast Database
Recommend
Irrigation
Schedule
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Soil data from STATSGO
Soil
Available
Water
Capacity
Soil Type Allow-
able
Dryness
Est.
Runoff
INPUT OUTPUT
Available Water Capacity Soil Type Management Allowable Depletion
(Allowable Dryness)
Curve Number
(for Estimating Precipitation Runoff)
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Mechanics for the weather forecast
INPUT OUTPUT
Weather RTMA NDFD Ref
ET Precip
National Digital Forecast Database
Real-time Mesoscale Analysis
Precipitation
Reference Evapotranspiration
Previous Week
Next Week
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It has HIGH spatial resolution
It has RGB, and NIR bands
NAIP (National Agriculture Imagery Program)
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NAIP images report only digital numbers (DN) and bands are not intercalibrated
NAIP (National Agriculture Imagery Program)
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Matching Landsat to NAIP
Find the most recent NAIP image that has
near infrared band
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Matching Landsat to NAIP
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NAIP vs Landsat Calibration Steps
1) Calculate NDVI with Landsat
2) Get the top and bottom 10 percent of the NDVI from Landsat
3) Mask NAIP with that top and bottom 10 percent from Landsat
4) For the masked NAIP, do the texture analysis for 30 m kernel
that is aligned with Landsat pixels
5) Get the Top 20 most homogeneous pixels from the masked
NAIP
6) That gives top 2 percent of the Landsat pixels and bottom 2
percent of the entire Landsat NDVI
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GLCM is Grey
Level Co-
occurrence
Matrix
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GLCM is Grey
Level Co-
occurrence
Matrix
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NAIP DN to NAIP Reflectance
NIR
Red
NAIP
Landsat
Reflectance in NIR and Red vs. DN
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Is that calibration sufficient?
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Adjusting Calibrated NAIP image for Time of Year
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CASE STUDY
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GEARUP pulls down 7-day weather and rainfall forecasts from the National Digital Forecast
Data Set of National Weather Service and Calculates Reference Evapotranspiration
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One output from GEARUP is an estimate of Volume of Water Used based on Area