Past Projects and Resources
Integrated Trends Analysis Team
Additional 2018 Tidal Trends
Additional Long-Term Tidal Trends
Additional Long-Term Flow-Adjusted Tidal Trends
Additional Short-Term Tidal Trends
Additional Short-term Flow-Adjusted Trends
Maps of 2018 Tidal Trends
1. Long-Term Tidal Trends
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Surface TN, Annual, 1985-2018 (973.2 KB)
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Surface TP, Annual, 1985-2018 (971.33 KB)
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Secchi Disk Depth, Annual, 1985-2018 (970.68 KB)
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Surface Total Suspended Solids, Annual, 1999-2018 (971.52 KB)
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Surface Water Temperature, Annual, 1985-2018 (972.6 KB)
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Surface Chlorophyll-a, Spring, 1985-2018 (971.77 KB)
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Surface Chlorophyll-a, Summer, 1985-2018 (971.8 KB)
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Bottom Dissolved Oxygen, Summer, 1985-2018 (971.96 KB)
2. Long-term Flow-Adjusted Tidal Trends
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Surface TN, Annual, 1985-2018 (973.97 KB)
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Surface TP, Annual, 1985-2018 (971.69 KB)
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Secchi Disk Depth, Annual, 1985-2018 (972.09 KB)
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Surface Total Suspended Solids, Annual, 1999-2018 (972.33 KB)
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Surface Water Temperature, Annual, 1985-2018 (973.75 KB)
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Surface Chlorophyll-a, Spring, 1985-2018 (972.87 KB)
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Surface Chlorophyll-a, Summer, 1985-2018 (973.13 KB)
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Bottom Dissolved Oxygen, Summer, 1985-2018 (973.24 KB)
3. Short-term Tidal Trends
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Surface TN, Annual, 2009-2018 (972.06 KB)
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Surface TP, Annual, 2009-2018 (971.64 KB)
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Secchi Disk Depth, Annual, 2009-2018 (970.98 KB)
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Surface Total Suspended Solids, Annual, 2009-2018 (971.65 KB)
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Surface Water Temperature, Annual, 2009-2018 (973.14 KB)
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Surface Chlorophyll-a, Spring, 2009-2018 (972.11 KB)
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Surface Chlorophyll-a, Summer, 2009-2018 (972.59 KB)
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Bottom Dissolved Oxygen, Summer, 2009-2018 (972.07 KB)
4. Short-term Flow-Adjusted Tidal Trends
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Surface TN, Annual, 2009-2018 (972.63 KB)
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Surface TP Annual, 2009-2018 (972.06 KB)
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Secchi Disk Depth, Annual, 2009-2018 (972.31 KB)
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Surface Total Suspended Solids, Annual, 2009-2018 (972.63 KB)
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Surface Water Temperature, Annual, 2009-2018 (973.92 KB)
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Surface Chlorophyll-a, Spring, 2009-2018 (973.09 KB)
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Surface Chlorophyll-a, Summer, 2009-2018 (973.3 KB)
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Bottom Dissolved Oxygen, Summer, 2009-2018 (973.44 KB)
GAM Documentation
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Draft-GAM Method for Chesapeake 5-10-18 (1.06 MB)
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Appendix 1A Baytrends Quick Start Instructions (2.2 MB)
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Appendix 2.1A example R Package Files (852.74 KB)
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Appendix 2.3A - QW Data Format (164 KB)
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Appendix 2.4A Ex GAM Models (690.32 KB)
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Appendix 2.5A Percent Change (519.04 KB)
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Appendix 2.6A Censored Data Approaches (618.3 KB)
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Appendix 2.6B Summary of Censoring (582.23 KB)
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Appendix 2.6C Censoring Scenarios (8.24 MB)
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Appendix 2.7A Lab Change Approach (693.63 KB)
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Appendix 2.8A Create Seasonally Detrended Flow and salinity Data sets (288 KB)
Seasonal Kendall & GAM Comparison
This tab provides documentation for efforts to compare methods between the Seasonal Kendall and GAM statistical approaches to determining water quality trends.
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Measuring and Explaining Trends in Water Quality - Jeni Keisman (240.31 KB)
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Water Quality Criteria Attainment Patterns - Mindy Ehrich (3 MB)
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GAM Development Briefing Oct 2015 - Rebecca Murphy (1.72 MB)
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Monitoring Data in Support of Mid-Point Assessment - Doug Moyer, Joel Blomquist, Jeni Keisman (7.27 MB)
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SK/GAM Comparison - Kyle Hinson (940.52 KB)
ITAT Web Publishing Policy
This document outlines the policies that the Integrated Trends Analysis Team will follow in publishing meeting presentation materials for a public audience.
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Web Publishing Policy (91.3 KB)