Cyndy Loftin, PhD (Former Employee)
Science and Products
Filter Total Items: 52
A manual for remote sensing of Maine lake clarity A manual for remote sensing of Maine lake clarity
The purpose of this manual is to support use of satellite-based remote sensing for statewide lake water-quality monitoring in Maine. The authors describe step-by-step methods that combine Landsat and MODIS satellite data with field-collected Secchi disk data for statewide assessment of lake water clarity. Landsat can be simultaneously used to assess more than Maine 1,000 lakes ≥ 8 ha...
Authors
Ian M. McCullough, Cyndy Loftin, Steven A. Sader
Shifts in controls on the temporal coherence of throughfall chemical flux in Acadia National Park, Maine, USA Shifts in controls on the temporal coherence of throughfall chemical flux in Acadia National Park, Maine, USA
Major ion and mercury (Hg) inputs to terrestrial ecosystems include both wet and dry deposition (total deposition). Estimating total deposition to sensitive receptor sites is hampered by limited information regarding its spatial heterogeneity and seasonality. We used measurements of throughfall flux, which includes atmospheric inputs to forests and the net effects of canopy leaching or...
Authors
Sarah J. Nelson, Katherine E. Webster, Cynthia S. Loftin, Kathleen C. Weathers
Lakes without Landsat? Implications of scale and an alternative approach to regional remote lake monitoring using MODIS 250 m imagery Lakes without Landsat? Implications of scale and an alternative approach to regional remote lake monitoring using MODIS 250 m imagery
We evaluated use of MODIS 250 m imagery for remote lake monitoring in Maine. Despite limited spectral resolution (visible red and near infrared bands), the twice daily image capture has a potential advantage over conventionally used, often cloudy Landsat imagery (16 day interval) when short time windows are of interest. We analyzed 364 eligible (≥100 ha) Maine lakes during late summer...
Authors
Ian M. McCullough, Cynthia S. Loftin, Steven A. Sader
Landsat imagery reveals declining clarity of Maine’s lakes during 1995-2010 Landsat imagery reveals declining clarity of Maine’s lakes during 1995-2010
Water clarity is a strong indicator of regional water quality. Unlike other common water-quality metrics, such as chlorophyll a, total P, or trophic status, clarity can be accurately and efficiently estimated remotely on a regional scale. Satellite-based remote sensing is useful in regions with many lakes where traditional field-sampling techniques may be prohibitively expensive...
Authors
Ian M. McCullough, Cynthia S. Loftin, Steven A. Sader
An algal model for predicting attainment of tiered biological criteria of Maine's streams and rivers An algal model for predicting attainment of tiered biological criteria of Maine's streams and rivers
State water-quality professionals developing new biological assessment methods often have difficulty relating assessment results to narrative criteria in water-quality standards. An alternative to selecting index thresholds arbitrarily is to include the Biological Condition Gradient (BCG) in the development of the assessment method. The BCG describes tiers of biological community...
Authors
Thomas J. Danielson, Cyndy Loftin, Leonidas Tsomides, Jeanne L. DiFranco, Beth Connors, David L. Courtemanch, Francis Drummond, Susan Davies
Combining lake and watershed characteristics with Landsat TM data for remote estimation of regional lake clarity Combining lake and watershed characteristics with Landsat TM data for remote estimation of regional lake clarity
Water clarity is a reliable indicator of lake productivity and an ideal metric of regional water quality. Clarity is an indicator of other water quality variables including chlorophyll-a, total phosphorus and trophic status; however, unlike these metrics, clarity can be accurately and efficiently estimated remotely on a regional scale. Remote sensing is useful in regions containing a...
Authors
Ian M. McCullough, Cyndy Loftin, Steven A. Sader
Science and Products
Filter Total Items: 52
A manual for remote sensing of Maine lake clarity A manual for remote sensing of Maine lake clarity
The purpose of this manual is to support use of satellite-based remote sensing for statewide lake water-quality monitoring in Maine. The authors describe step-by-step methods that combine Landsat and MODIS satellite data with field-collected Secchi disk data for statewide assessment of lake water clarity. Landsat can be simultaneously used to assess more than Maine 1,000 lakes ≥ 8 ha...
Authors
Ian M. McCullough, Cyndy Loftin, Steven A. Sader
Shifts in controls on the temporal coherence of throughfall chemical flux in Acadia National Park, Maine, USA Shifts in controls on the temporal coherence of throughfall chemical flux in Acadia National Park, Maine, USA
Major ion and mercury (Hg) inputs to terrestrial ecosystems include both wet and dry deposition (total deposition). Estimating total deposition to sensitive receptor sites is hampered by limited information regarding its spatial heterogeneity and seasonality. We used measurements of throughfall flux, which includes atmospheric inputs to forests and the net effects of canopy leaching or...
Authors
Sarah J. Nelson, Katherine E. Webster, Cynthia S. Loftin, Kathleen C. Weathers
Lakes without Landsat? Implications of scale and an alternative approach to regional remote lake monitoring using MODIS 250 m imagery Lakes without Landsat? Implications of scale and an alternative approach to regional remote lake monitoring using MODIS 250 m imagery
We evaluated use of MODIS 250 m imagery for remote lake monitoring in Maine. Despite limited spectral resolution (visible red and near infrared bands), the twice daily image capture has a potential advantage over conventionally used, often cloudy Landsat imagery (16 day interval) when short time windows are of interest. We analyzed 364 eligible (≥100 ha) Maine lakes during late summer...
Authors
Ian M. McCullough, Cynthia S. Loftin, Steven A. Sader
Landsat imagery reveals declining clarity of Maine’s lakes during 1995-2010 Landsat imagery reveals declining clarity of Maine’s lakes during 1995-2010
Water clarity is a strong indicator of regional water quality. Unlike other common water-quality metrics, such as chlorophyll a, total P, or trophic status, clarity can be accurately and efficiently estimated remotely on a regional scale. Satellite-based remote sensing is useful in regions with many lakes where traditional field-sampling techniques may be prohibitively expensive...
Authors
Ian M. McCullough, Cynthia S. Loftin, Steven A. Sader
An algal model for predicting attainment of tiered biological criteria of Maine's streams and rivers An algal model for predicting attainment of tiered biological criteria of Maine's streams and rivers
State water-quality professionals developing new biological assessment methods often have difficulty relating assessment results to narrative criteria in water-quality standards. An alternative to selecting index thresholds arbitrarily is to include the Biological Condition Gradient (BCG) in the development of the assessment method. The BCG describes tiers of biological community...
Authors
Thomas J. Danielson, Cyndy Loftin, Leonidas Tsomides, Jeanne L. DiFranco, Beth Connors, David L. Courtemanch, Francis Drummond, Susan Davies
Combining lake and watershed characteristics with Landsat TM data for remote estimation of regional lake clarity Combining lake and watershed characteristics with Landsat TM data for remote estimation of regional lake clarity
Water clarity is a reliable indicator of lake productivity and an ideal metric of regional water quality. Clarity is an indicator of other water quality variables including chlorophyll-a, total phosphorus and trophic status; however, unlike these metrics, clarity can be accurately and efficiently estimated remotely on a regional scale. Remote sensing is useful in regions containing a...
Authors
Ian M. McCullough, Cyndy Loftin, Steven A. Sader