Mapping Irrigated Areas of the World @ the End of Last Millennium and The Beginning of this Millennium using Multi-Scale Time-Series Satellite Sensor Data

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Mapping Irrigated Areas of the World _at_ the End
of Last Millennium and The Beginning of this
Millennium using Multi-Scale Time-Series
Satellite Sensor Data

• Prasad Thenkabail, Chandrashekkar Biradar, Hugh
  Turral, and Mitch Schull

Ganges basin
2001-2002
1982-1985
IWMI Irrigated Area Map of the World Version 1.0
(upcoming)
Krishna basin
1996-1999
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Mapping Irrigated Areas of the World
Overarching Goals

• Map Irrigated Areas of the World _at_ 1 to 10-km
  scale
• 2. Map Irrigated areas of selected River Basins _at_
  500-m scale

In Segments
IWMI Irrigated Area Map of the World Version Beta
(upcoming)
Annual Rainfall lt36 cm
Ganges IWMI
Ganges Kassel/FAO
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Key Achievements and Knowledge
Generation
http//www.iwmidsp.org/
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Mapping Irrigated Areas of the World _at_ IWMI
Key Achievements

• Global irrigated area maps and characteristics
  Version 1.0 of IWMI (release November end, 2004)
• 1-10 km resolution
• Characteristics of irrigated area classes
• 2. River basin Irrigated area maps and
  characteristics of IWMI (available online
  www.iwmidsp.org)
• 500m -10-km resolution
• Ganges and Krishna basins
• Accuracy assessments
• Comparisons with USGS, GLC, National Census, and
  kassel
• Advanced methods and techniques
• A number of advanced innovative methods and
  techniques (e.g., hyperspectral, quantitative
  spectral matching) used will be discussed in 3-4
  papers in pipeline for year 2005.
• 4. Online access to IWMIs Data and Knowledge on
  irrigated areas
• Primary data used in the project is made
  available globally through online access
• Irrigated area maps and characteristics made
  available globally through online access

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IWMI Irrigated Area Map of the World Version 1.0
(upcoming)
Irrigated Areas _at_ 1-10 km
Only irrigated area shown above de-highlighting
all other classes shown below
Zoom into Irrigated Areas _at_ 150-m
Snap-shot of Irrigated Areas _at_ 150-m
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Dynamic Irrigated Area Maps and Characteristics
Example Krishna River Basin
AVHRR NDVI, Monthly, 1997-1999
AVHRR NDVI, Monthly, 1982-1985
Very Slow 10fps
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How Does it Compare with Others?
http//www.iwmidsp.org/
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Global Map of Irrigated Areas, Indo-Ganges (500m,
IWMI, 2004)
Irri Rice, sugarcane Irri Rice, sugarcane Irri
Other crops, fallow Irri Water logged crop Irri
Rice with wetlands Irri Rice other crops
33.1 Mha Irrigated
Note 12.3 Mha rainfed supplemental Irri. (not
in image)
500-m MODIS
Total study area 133 Mha
Global Map of Irrigated Areas (.5 degree, Kassel
/ FAO, 2001)
31.2 Mha Irrigated
50-km Digitized from maps, various sources from
Nations
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Irrigated Area Map (Kassel/FAO)
Irrigated Area Map (IWMI)
Differences in Irrigated Area Mapping
IWMI
Percent Irrigated lt 0.1 or null
Landsat Geocover 2000 image
Irrigated Rice/Sugarcane
Kassel
Irrigated Other crops
Truth
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Ganges River Basin Irrigated Areas from
Different RS Studies
Ganges-Classification Irrigated area
deviation from this study (also includes
rainfed with suppl.) USGS (1992-1993) 32,255,630
(ha) 16.6 () less than ours GLC (2000)
56,466,954 (ha) 33.4
() more than ours IWMI (2001-2002) 37,602,567
(ha) This study (irrigated
supplemental) IWMI (2001-2002) 26,873,934 (ha)
This study (irrigated pure)
Change in a decade is 16.6 additional area
(taking IWMI irrigated supplemental).
USGS (1993)
Just look in Ganges area
GLC has 2 irrigated area classes class 32 and 33.
Class 33 in actual is a mix of rainfed and
supplemental.
IWMI (2004)
GLC (2000)
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Mapping Irrigated Areas of the World
IWMI vs. Others
Source Level Scale or resolution Spatial
Map Remarks 1.0 Irrigated Area Mapping IWMI
(2004-05) Global 1-10 km yes Work in progress.
Multi scale satellite sensor data,
temporal, DEM, rainfall, and other
secondary datasets River
basins 500-m yes MODIS data for Krishna and
Ganges Kassel/FAO Global 50-km Yes Nat
ional Statistics and Maps 2.0 LULC Mapping
(deriving rough estimates of irrigated areas
from indirect means) FAO Global various No Fro
m National census datasets GLC2000 Global 1-km
yes SPOT Vegetation data _at_ 1-km USGS
(1992-93) Global 1-km yes AVHRR 1992-93
data 3.0 National Efforts (Note has gone into
Kassel/FAO effort) Individual Countries National v
arious No National census data
IWMI Irrigated Area Mapping Advances (a) first
RS/GIS based work _at_ Global level (thereby
consistent set of indicators for entire World),
(b) the best spatial scale so far from any
sources _at_ Global level, and (c) in methods and
techniques.
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Use of Irrigated area Information
http//www.iwmidsp.org/
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Mapping Irrigated Areas of the World
Use Data and
Knowledge
1. GPG, CP, IWMI researcher
a. filling
information gap
b. providing consistent information
c. Mapping baseline conditions
2. Inputs to Global models
a. Area irrigated b. Spatial distribution of
irrigated c. Dominant crops in each irrigated
classes d. Intensity of irrigation ( irri. in a
pixel) for each month e. Characteristics of
irrigated classes a. Green up b. Green peak c.
Amplitude d. Magnitude e. Biomass
accumulation f. single, double, continuous
cropping
3. Capacity for other Global work _at_ IWMI
a.
Wetlands of the World
b. GW
studies in the region
c. Water productivity
estimations in river basins
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Where do we go from here?
http//www.iwmidsp.org/
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Mapping Irrigated Areas of the World
Where do We Go From
Here

• Global irrigated area map of the World _at_ 1-10 km
  Version 2.0
• Evaluations and consultations on version 1.0
• Improvements to version 1.0, release of version
  2.0 (e.g., major crop groups)
• Comprehensive characteristics of irrigated area
  classes (e.g., irrigation intensity)
• Animations and behavior of irrigated areas over
  time and space
• Accuracy assessment
• Comparison with National statistics and/or with
  other studies and/or ground truth
• Wide dissemination
• 2. Global irrigated area mapping _at_ 30 to 150-m
  scale
• 2005 completion and release of version 1.0
• 2006 write up and release of version 2.0
• Budget for 2005 is 275k including staff
  time (1 full time RS expert, 2 part time RS
  experts, 1 senior researcher for 6 months, 1
  month of principal scientist, data, software,
  hardware) 2006 the budget will be 200k.
• Online access to IWMIs Data and Knowledge on
  irrigated areas

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Questions and Discussions