Type Shapefile
To show the locations of prominent peaks on Yap.
This dataset shows the locations of prominent peaks on the high islands in Yap Lagoon. It was developed by Island Research & Education Initiative (iREi) (2019) by manually digitizing features from the topographic map of Yap, 1:25,000 scale, published by the U.S. Geological Survey (2001). Note that the actual names contained in the dataset are copied from the source mapand are not necessarily correct or aligned with Yapanorthography.
GIS dataset by Island Research & Education Initiative (iREi) based on data from U.S. Geological Survey.
There are no expressed warranties associated with the release of these databases. Specifically, no warranty is made that the GIS data or any subsequent updates will be error free and no warranty is made regarding the positional or thematic accuracy of the GIS data. The GIS data and any features it depicts do not represent or confer any legal rights, privileges, benefits, boundaries or claims of any kind.
There is no extent for this item.
There is no scale range for this item.
The dataset is included in the Digital Atlas of Micronesia, module Yap, by Island Research & Education Initiative (iREi) in collaboration with Water and Environmental Research Institute of the Western Pacific (WERI) at the University of Guam and funding from United States Geological Survey (USGS) under WRRI 104-B Program and FSM Department of Environment, Climate Change & Emergency Management (DECEM).
GIS dataset by Island Research & Education Initiative (iREi) based on data from U.S. Geological Survey.
There are no expressed warranties associated with the release of these databases. Specifically, no warranty is made that the GIS data or any subsequent updates will be error free and no warranty is made regarding the positional or thematic accuracy of the GIS data. The GIS data and any features it depicts do not represent or confer any legal rights, privileges, benefits, boundaries or claims of any kind.
The names require thorough verification and correction of spellings to conform with Yapese orthography.
The absolute vertical accuracy is not known by depends largely on the accuracy of the digital elevation model used to calculate the elevation. Errors might also have been introduced when the data was shifted.
1. Compare two sources (KML and GNIS); 2. Import all data derived from the KML dataset and add summits from GNIS dataset not already in KML file. 3. Calculate elevation from digital elevation model (Note that the elevation information from the GNIS dataset was not included because errors were found -> inconsistent units -> some values seemed to be in meters while other in feet).
To create a dataset showing major peaks and summits.
a. KML dataset downloaded online; b. Converted KML dataset to shapefile; c. Projected shapefile to WGS84 UTM Zone 54N; d. Formatted attribute table and added field (name, source, etc).
The data was downloaded from the GNIS website and formatted for GIS and shifted about 442 meters NW to match 2016 WorldView-3 imagery.
Feature geometry.
Esri
Coordinates defining the features.
In WGS 84
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
From source file
Original data
Additional notes. The information imported from the KML may not be complete because of the character limitation of the text field.
KML source file
Elevation in meters above mean sea level
Derived from digital elevation model
Elevation in meters above mean sea level
Source data
In WGS 84