This material is based upon work supported by NASA through contract NNL16AA05C and cooperative agreement NNX14AB60A. Any mention of a commercial product, service or activity in this material does not constitute NASA endorsement. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Aeronautics and Space Administration and partner organizations. Team Members Include a map that has easily readable text and a legend. Including the study period is optional. For ALL images – make sure all text is legible and add legends separately (so they can be moved or resized). If text is not editable, a team member must be available to make changes with a very short turn-around time (hours, not days) after submission. Georgia – Athens | Spring 2018 Osa Peninsula Water Resources Assessing Threats to River Water Quality and Mangrove Health Based on Watershed Land Use on the Osa Peninsula, Costa Rica Conclusions A comparison between the classifications for 1987 and 2017 indicate that palm plantation, urban/bare area, and grassland decreased while negra forra, water, forest, and wetlands increased. The Osa Peninsula saw a 10.7% increase in vegetation cover between 1987 and 2017 as indicated by our land cover classification and NDVI analysis. These results demonstrate historical land cover change trends and provide insights for evaluating policies and conservation strategies. Objectives Produce high resolution time series maps of land use and land cover change in the Osa Peninsula for the years 1987, 1999 and 2017. Determine the rates of land use change in riparian zones. Quantify the effectiveness of the 1996 Forest Law 7575 in curbing deforestation and erosion in riparian zones. Create accessible public outreach materials to inform the local community on how to implement sustainable practices. Acknowledgements Dr. Marguerite Madden, University of Georgia Hilary Brumberg, Osa Conservation Dr. Andy Whitworth, Osa Conservation Project Partner Osa Conservation Methodology ArcMap: Unsupervised Classification ArcMap: NDVI Analysis Landsat 8 OLI Data Collection Landsat 5 TM PlanetScope Terra ASTER 1987 1999 2017 2016 2017 DEM: Elevation Data Land Cover Time Series High Resolution Land Cover Map – Case Study Area (2016-2017) Emily Pauline Suravi Shrestha Project Lead Marie Bouffard John Langstaff Candice Lee Sam Tingle Earth Observations Landsat 8 OLI Landsat 5 TM Terra ASTER Abstract The Osa Peninsula, located in the southern region of Costa Rica’s Pacific Coast, is one of the most biologically-diverse places on Earth and is a popular ecotourism destination. However, the area faces watershed degradation and loss of biodiversity due to deforestation, pollution from agriculture, and human settlement. NASA DEVELOP worked with Osa Conservation to analyze land use and land cover change in the Osa Peninsula to better understand threats to river water quality and mangrove health. This project used Landsat 5 Thematic Mapper (TM), Landsat 8 Operational Land Imager (OLI), Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), to create a land cover time series map from 1987 to 2017. These time series data were used to compare land use over time, as well as patterns in water quality, mangrove health, erosion, and deforestation. The time series also helped to identify the impact of the creation of protected areas and the 1996 Forest Law 7575, which aimed to support reforestation and riparian health. Osa Conservation will use and distribute results to the National System of Conservation Areas (SINAC), Ministry of Environment and Energy (MINAE), and local communities to inform land management decisions, policy enforcement, education and outreach initiatives, and watershed restoration and monitoring. Results Study Area Costa Rica Water Bare/Urban Negra forra Wetland Forest Palm Grassland Land Cover Classification Change in Normalized Difference Vegetation Index (NDVI) between 1987 and 2017 1987 1999 2017 Area of Major Land Cover Types for 1987, 1999 and 2017 (%) Increase in NDVI Decrease in NDVI No Change 0% 10% 20% 30% 40% 50% 60% 70% 80% Forest Palm plantation Grassland Percent of Total Area Major Land Cover Type 1987 1999 2017
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This material is based upon work supported by NASA through contract NNL16AA05C and cooperative agreement NNX14AB60A. Any mention of a commercial product, service or activity in this material does not constitute NASA endorsement. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Aeronautics and Space Administration and partner organizations.
Team Members
Include a map that has easily readable text and a legend. Including the study period is optional.
For ALL images – make sure all text is legible and add legends separately (so they can be moved or resized). If text is not editable, a team member must be available to make changes with a very short turn-around time (hours, not days) after submission.
Georgia – Athens | Spring 2018Osa Peninsula Water Resources
Assessing Threats to River Water Quality and Mangrove Health Based on Watershed Land Use on the Osa Peninsula, Costa Rica
Conclusions A comparison between the classifications for 1987 and 2017 indicate that palm
plantation, urban/bare area, and grassland decreased while negra forra, water, forest, and wetlands increased.
The Osa Peninsula saw a 10.7% increase in vegetation cover between 1987 and 2017 as indicated by our land cover classification and NDVI analysis.
These results demonstrate historical land cover change trends and provide insights for evaluating policies and conservation strategies.
ObjectivesProduce high resolution time series maps of land use and land cover change in the
Osa Peninsula for the years 1987, 1999 and 2017.
Determine the rates of land use change in riparian zones.
Quantify the effectiveness of the 1996 Forest Law 7575 in curbing deforestation anderosion in riparian zones.
Create accessible public outreach materials to inform the local community on how toimplement sustainable practices.
AcknowledgementsDr. Marguerite Madden, University of Georgia
Hilary Brumberg, Osa Conservation
Dr. Andy Whitworth, Osa Conservation
Project PartnerOsa Conservation
Methodology
ArcMap:
Unsupervised
Classification
ArcMap:
NDVI Analysis
Landsat 8 OLI
Data Collection
Landsat 5 TM PlanetScopeTerra ASTER
1987 1999 2017
2016 2017
DEM:
Elevation Data
Land Cover Time
Series
High Resolution Land
Cover Map – Case
Study Area
(2016-2017)
Emily PaulineSuravi Shrestha
Project Lead
Marie Bouffard John Langstaff Candice Lee Sam Tingle
Earth Observations
Landsat 8 OLI Landsat 5 TM Terra ASTER
AbstractThe Osa Peninsula, located in the southern region of Costa Rica’s Pacific Coast, is one of the
most biologically-diverse places on Earth and is a popular ecotourism destination. However, the
area faces watershed degradation and loss of biodiversity due to deforestation, pollution from
agriculture, and human settlement. NASA DEVELOP worked with Osa Conservation to
analyze land use and land cover change in the Osa Peninsula to better understand threats to
river water quality and mangrove health. This project used Landsat 5 Thematic Mapper (TM),
Landsat 8 Operational Land Imager (OLI), Terra Advanced Spaceborne Thermal Emission and
Reflection Radiometer (ASTER), to create a land cover time series map from 1987 to 2017.
These time series data were used to compare land use over time, as well as patterns in water
quality, mangrove health, erosion, and deforestation. The time series also helped to identify the
impact of the creation of protected areas and the 1996 Forest Law 7575, which aimed to
support reforestation and riparian health. Osa Conservation will use and distribute results to
the National System of Conservation Areas (SINAC), Ministry of Environment and Energy
(MINAE), and local communities to inform land management decisions, policy enforcement,
education and outreach initiatives, and watershed restoration and monitoring.
Results
Study Area
Costa Rica
Water
Bare/Urban
Negra forra
Wetland
Forest
Palm
Grassland
Land Cover Classification
Change in Normalized Difference Vegetation Index (NDVI) between 1987 and 2017
1987 1999 2017
Area of Major Land Cover Types for 1987, 1999 and 2017 (%)
Increase in NDVI
Decrease in NDVI
No Change
0%
10%
20%
30%
40%
50%
60%
70%
80%
Forest Palm plantation Grassland
Perc
en
t o
f T
ota
l A
rea
Major Land Cover Type
1987
1999
2017
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