Mojave Desert Pilot Project Overview and Deliverables

1
Mojave Desert Pilot Project Overview and
Deliverables

• Saltcedar Identification and Mapping
• Services Provided by GeoSpatial Partners LLC.
• Contract Coordinator Valerie Page
• Mojave WMA Coordinator

2
Project Goals

• To Identify and map saltcedar along the Mojave
  River
• Derive EvapoTranspiration map for saltcedar
• To help RCD in noxious weed inventory efforts and
  provide the Mojave Water Agency with geo-spatial
  data to support water management efforts

3
Data

• Satellite data
• High resolution image (Ikonos 4 m multispectral)
  collected on September 17, 2003
• Medium Resolution Landsat 7 image collected on
  August 04, 2002
• Field Data (June 21, 2004)
• Record of Saltcedar sample location for class
  membership development and accuracy assessment
• Record of sample spectra including saltcedar,
  cotton wood, willow and other land use types
• Record of spectra from water body and sand using
  CROPSCAN Radiometer to help in the image
  atmospheric correction process.

4
Data

• Evapotranspiration
• Downloaded year 2002 and 2003 daily weather data
  including ET0 from the CIMIS database
• Station ID 117 Victorville
• Station ID 134 Barstow NE
• Consulted weed experts and publications for
  appropriate coefficients to used to calculate
  saltcedar water use

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Procedure

• Saltcedar Map
• Used GeoSpatial Partners proprietary algorithm
  to develop saltcedar membership function.
  Function based on saltcedar spectral and spatial
  behavior.

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Procedure

• Saltcedar Water Use (ET)
• Used Equation reported on CIMIS web site
• ET KsKdKmcET0
• Ks species factor
• Kd density factor
• Kmc microclimate factor
• ET0 reference evapotranspiration
  (recorded by CIMIS)

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Procedure

• ET coefficients for Saltcedar
• Ks 0.1- 0.3 (used 0.18 to be consistent with
  previous reports)
• Kmc 1 (recommended)
• Kd was derived from imagery
• Kd Factor
• Derived by normalizing saltcedar vegetation cover
  to vegetation cover from reference grass where
  ET0 was measured (CIMIS)

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Project Site
Landsat 7 (Barstow subset)
Ikonos (Victorville)
Landsat 7 (Victorville)
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Classification Result Ikonos Image Sept. 17, 2003
10
2003 Saltcedar Water Use Ikonos Image, Sept.
17, 2003
11
Classification Result Landsat 7 Image, Aug. 04,
2002
12
2002 Saltcedar Water Use Landsat7 Image, Aug.
04, 2002
13
Accuracy Assessment
Ground Truth
Classification
Sample Distributions
Error of Commission 9.09 Error of Omission
9.09 Overall Accuracy 95.2
Accuracy assessment results for the
classification that used the high resolution
IKONOS image. Error sources are high density
cotton wood and willow and single saltcedar in
sandy areas.
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Saltcedar ET
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Deliverables (on CDs)

• Classification Maps
• Victorville_SaltcedarMap_Ikonos2003.img
  (saltcedar class 3)
• Barstow_saltcedarMap_Landsat2002.img (saltcedar
  class 3)
• Victorville_saltcedarMap_Landsat2002.img
  (saltcedar class 3)

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Deliverables (on CDs)

• Saltcedar Water Use Maps (ET in inch)
• File naming convention
• ltMain citygt_et_ltMonthYeargt.img (monthly ET values
  12x3 files)
• ltMain citygt_et_ltYeargt.img (yearly ET values 1x3
  files)
• File Format
• ERDAS Imaging file, can be imported in ArcGIS