Kathryn SheffieldState Government Victoria · Agriculture Victoria
Kathryn Sheffield
PhD
About
35
Publications
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Introduction
Publications
Publications (35)
Hydrology and water availability are key determinants of the health of riparian vegetation systems, and an understanding of the interactions between vegetation and hydrology is a prerequisite for the maintenance and improvement of these systems under managed water regimes. Changes to natural flooding cycles, caused by the regulation of river flows...
SEBAL-METRIC estimates of evapotranspiration (ET) were derived from Landsat-5 imagery of Sunraysia Irrigation Region of Victoria, Australia. Paired estimates of ET and vegetation cover, NDVI, were derived from an image taken mid-season on 5 January 2009. NDVI and ET were attributed to land use based on data provided by SunRISE21 Inc. Relationships...
Synergistic application of NDVI from diverse sensors has been an interest of researchers in the field of natural resource management for over two decades. Attempts have been made to deal with the sensor-specific differences in NDVI which stem from a number of factors. In this study, an NDVI comparison has been made between Landsat-7 ETM+ and five o...
Urban fauna communities may be strongly influenced by environmental and socio-economic factors, but the relative importance of these factors is poorly known. Most research on urban fauna has been conducted in large cities and it is unclear if the patterns found in these locations coincide with those from smaller human settlements. We examined the r...
(1) Background: A simple approach to map irrigated landcover has been introduced by using measures derived from the optical spectral range as an alternative to the thermal range. It has been demonstrated that substituting surface temperature (Ts, ‘thermal approach’) with SWIR-transformed reflectance (STR, ‘optical approach’) to detect surface moist...
Remote sensing from optical radiometers in space offers a nondestructive approach to estimating above ground biomass (AGB) with high spatial and temporal resolution, but the application is challenged by cloud cover and differences in soil background and crop phenology. We present a framework based on Sentinel-2 imagery for relating the adjusted sum...
Alligator weed (Alternanthera philoxeroides (Mart.) Griseb) forms dense infestations in aquatic environments and is the focus of intensive management programs in many jurisdictions within Australia, including Victoria. A critical component of weed biosecurity programs is surveillance to find the location and extent of the target weed so that contro...
Monitoring of irrigated land cover is important for both resource managers and farmers. An operational approach is presented to use the satellite-derived surface temperature and vegetation cover in order to distinguish between irrigated and non-irrigated land. Using an iterative thresholding procedure to minimize within-class variance, the bilevel...
Weeds can impact many ecosystems, including natural, urban and agricultural environments. This paper discusses core weed biosecurity program concepts and considerations for urban and peri-urban areas from a remote sensing perspective and reviews the contribution of remote sensing to weed detection and management in these environments. Urban and per...
Effective and efficient systems for surveillance, eradication, containment and management of biosecurity threats require methods to predict the establishment, population growth and spread of organisms that pose a potential biosecurity risk. To support Victorian forest biosecurity operations, Agriculture Victoria has developed a landscape-scale, spa...
Remotely sensed data from Landsat-8 and Sentinel-2 were used to demonstrate the estimation of irrigation water requirement (ρ) for treed horticulture crops in an important irrigation district of Australia. Crop- and region-specific relationship between satellite-derived evapotranspiration (ET) and normalized difference vegetation index (NDVI) was c...
Objective
Successful control of an emergency animal disease outbreak requires the timely and accurate identification of properties of interest. The identification of commercial piggeries within study areas in the Goulburn–Murray Irrigation District in Victoria, Australia, is used to demonstrate the innovative application of object‐based image analy...
Benchmarking methods aim to identify best management practices by allowing producers to rank and compare on-farm yield and water use outcomes. We sought to develop a satellite-based biophysical approach to the benchmarking of yield and water use to overcome existing limitations on sample size, and to account for effects of vegetation cover and weat...
Land Use Information is a key dataset required to enable an understanding of the changing nature of our landscapes and the associated influences on natural resources and regional communities. The Victorian Land Use Information System (VLUIS) data product has been created within the State Government of Victoria to support land use assessments. The p...
There is a demand for regularly updated, broad-scale, accurate land cover information in Victoria from multiple stakeholders. This paper documents the methods used to generate an annual dominant land cover (DLC) map for Victoria, Australia from 2009 to 2013. Vegetation phenology parameters derived from an annual time series of the Moderate Resoluti...
Measuring different indicators of production and soil health over the long term will help build a picture of soil health and productivity across the landscape. This paper examines the potential contribution of satellite imagery to this area. This investigation undertook a very long time series analysis of Landsat imagery (approximately 40 years) an...
There is a demand for regularly updated, broad-scale, accurate land cover information in Victoria from multiple stakeholders. This paper documents the methods used to generate an annual dominant land cover (DLC) map for Victoria, Australia from 2009 to 2013. Vegetation phenology parameters derived from an annual time series of the Moderate Resoluti...
This paper compares satellite-based measures of the irrigation water requirement of table grape with official records of surface irrigation water supply (Victorian Water Register; www.waterregister.vic.gov.au) to farms in the Robinvale district of SE Australia in season 2011/12.
The objectives of this research were to develop a MOD13Q1 EVI based land cover classification protocol to generate a land cover map of Victoria and evaluate the accuracy of this map. In 2009, an extensive geographically stratified random sampling design was constructed and undertaken across the whole state. Twenty-three MOD13Q1 EVI image products w...
Irrigation has a significant impact on water resources. It is therefore important that objective assessments of the use of irrigation water are undertaken on a regular basis. Current affordable remote sensing technologies provide an opportunity to assess and monitor water use at farm and regional scales. This study demonstrates the use of satellite...
The availability of the USGS Landsat archive, which spans nearly 40 years, has presented many opportunities for land cover mapping [1]. This study aimed to develop an approach using the USGS Landsat archive to produce land cover maps which could be used to assess changes in land cover over time. The study area was located in the Wimmera region of n...
Satellite-based information was combined with field data to estimate crop water
requirement and yield potential in 74 fields of commercial fruit and nut crops
grown in the Shepparton and Sunraysia Irrigation Regions of northern Victoria,
Australia during the 2011/12 irrigation season. Comparisons of irrigation water
supply (grower practice) with sa...
The Victorian Land Use Information System (VLUIS) produces an annual land information product for the state of Victoria. It comprises three important characteristics of land information: tenure (ownership), use (property type), and cover (physical surface). The land cover component is created using a remote sensing approach. Using MODIS EVI 16-day...
Irrigation has a significant impact on regional water resources in south-eastern Australia. It is therefore important that objective
assessments of the current use of water are undertaken on a routine basis. New remote sensing technologies now provide an
opportunity to assess and monitor water use at farm and catchment scales. This study demonstrat...
The METRIC algorithm (Allen et al., 2007) was applied to a Landsat 5 image to assess the range of vegetation cover (measured as Normalised Difference Vegetation Index; NDVI), and rates of evapotranspiration (ET), of major horticultural crops grown in the Sunraysia Irrigation Region of SE Australia. The image represented the period of maximum foliag...
Competing demands for a limited water supply has led to a need for more effective regional water management to improve the balance between environmental and commercial water uses within catchments. Improved water management will be achieved with a greater understanding of how much water is used, and how much water is required, by various agricultur...
Riparian vegetation represents significant areas of water use in landscapes. An understanding of hydrology and vegetation dynamics within riparian zones is important for the development of ecologically appropriate management plans for these complex systems. To achieve this, measures of vegetation extent, health and activity are required, as these p...
Remote sensing is widely used as a tool to map and monitor environmental attributes, such as vegetation. This paper describes
a native vegetation ground data collection protocol that attempts to integrate the spatial resolution of several remotely
sensed datasets and the spatial variation of vegetation into a framework. A particular challenge of th...
This pilot project determines the potential for growing Cool Climate Grapes, high yield pasture and blue gum across Gippsland (Victoria, Australia), and the likely shift in that potential as projected climate change occurs in the region. It provides an indication of the information that can be generated combining Land Suitability Analysis and clima...
Evapotranspiration (ET) rates of citrus, grape and almond crops in the Sunraysia irrigation region were determined using the SEBAL-METRIC (Allen et al. 2007) method applied to a mid-season Landsat-5 TM image in 2009. ET measures were related to vegetation cover (Normalised Difference vegetation Index, NDVI), land use (provided by SunRISE21 Inc.), a...