This map shows the streams and rivers on Pohnpei. The dataset was formatted for GIS by Island Research & Education Initiative (iREi) (2017), using line and polygon KML files created by Alex Zuccarelli for Pohnpei Eco-Adventure Map Guide Series (2013) and modifying them to fit the most recent base layer. Note that these data show wide areas of rivers as polygons.
This map shows the rivers and streams on Pohnpei as represented on the U.S. Geological Survey (USGS) 1:25,000-scale topographic maps (2001). The dataset was extracted from the Digital Line Graphs (DLGs) from USGS and names from the Geographic Names Information System (GNIS) by Island Research & Education Initiative (iREi) (2017) and slightly modified to match the (partially) updated shoreline.
This map shows the natural outflow locations on Pohnpei, defined as points where streams and rivers discharge into the lagoon. The dataset was created by Island Research & Education Initiative (iREi) (2017) by identifying the points where streams and rivers from 1:25,000-scale U.S. Geological Survey topographic maps (2001) intersect with the most recent shoreline of Pohnpei.
This map shows the locations of the most significant waterfalls on Pohnpei. The data layer was formatted for GIS by Island Research & Education Initiative (iREi) (2017), using exclusively KML files created by Alex Zuccarelli for Pohnpei Eco-Adventure Map Guide Series (2013).
This map shows the theoretical drainage pattern on Pohnpei. The flow paths were created by Island Research & Education Initiative (iREi) and the University of Guam (2017). This was done by Maria Kottermair through hydrological modeling using a 10-meter Digital Elevation Model (DEM) created by U.S. Geological Survey based on topography compiled in 1975. Note that in very flat low-lying areas the data may indicate straight lines that are an artifact of the modeling process and do not reflect reality.
This map shows the flow accumulation on Pohnpei. Flow accumulation describes the amount of water in streams. The higher the value, the more water a particular location receives from areas uphill. The dataset was created by Island Research & Education Initiative (iREi) and the University of Guam (2017). This was done by Maria Kottermair through hydrological modeling using a 10-meter Digital Elevation Model (DEM) created by U.S. Geological Survey based on topography compiled in 1975. Note that in very flat low-lying areas the data may indicate straight lines that are an artifact of the modeling process and do not reflect reality.
This map shows the principal watersheds (drainage basins) on Pohnpei. The dataset was created by Island Research & Education Initiative (iREi) and the University of Guam (2017). Basin boundaries were delineated through hydrological modeling using a 10-meter Digital Elevation Model (DEM) created by U.S. Geological Survey based on topography compiled in 1975. Note that basin boundaries shown are modeled and, as such, reflect the DEM and not necessarily actual situation on the ground. The watershed boundaries may differ from actual management units, especially as smaller basins were sometimes merged to a ‘principal’ watershed to avoid too many small remnant basins.
This map shows Pohnpei's principal watersheds (drainage basins) and their sub-watersheds. The dataset was created by Island Research & Education Initiative (iREi) and the University of Guam (2017). All boundaries were delineated by Maria Kottermair through hydrological modeling using a 10-meter Digital Elevation Model (DEM) created by U.S. Geological Survey based on topography compiled in 1975. Note that apparently unnatural boundaries such as series of straight, parallel lines are artifacts of modeling and do not reflect reality.
This map shows the general distribution of freshwater resources on Pohnpei. The data layer was created by Island Research & Education Initiative (iREi) (2017) by scanning, georeferencing, and digitizing a very general paper map prepared by the U.S. Geological Survey (1944) for the Chief of Engineers, U.S. Army as part of the Strategic Engineering Study No. 109 titled Ponape including Pakin and Ant Islands (Carolines) Terrain Intelligence. The map was found in the library collection at the national campus of the College of Micronesia (COM).
This map shows the locations of the U.S. Geological Survey gaging stations on Pohnpei. The dataset was extracted by Island Research & Education Initiative (iREi) (2017) from Digital Line Graphs (DLGs). The DLGs were created by U.S. Geological Survey for the 1:25,000-scale topographic maps (2001).
This map shows the location of the active weather observation sites on Pohnpei. The data layer was created by Island Research & Education Initiative (iREi) (2017) using location information obtained from the National Weather Service office in Guam.
This map shows the average annual rainfall in inches on Pohnpei. The original data were derived from weather records from 1971-2000 by Chris Daly and Mike Halbleib of the PRISM Group at Oregon State University (2006) and the U.S. National Park Service (2006). It was later converted to vector format by the Natural Resources Conservation Service (NRCS).
