Type Shapefile
To show the rivers and streams on Chuuk.
This dataset shows the rivers and streams on the islands in Chuuk Lagoon as represented on the U.S. Geological Survey (USGS) 1:25,000-scale topographic maps (1996-97). It 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) (2020) and slightly modified to match the new base layer.
Original dataset by U.S. Geological Survey (USGS) Partly modified by Island Research & Education Initiative (iREi)
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 Chuuk, 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).
Original dataset by U.S. Geological Survey (USGS) Partly modified by Island Research & Education Initiative (iREi)
Publication date of topographic map
Reference imagery used for updating streams along shoreline.
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.
Topological requirements include the following: lines must begin and end at nodes, lines must connect to each other at nodes, lines do not extend through nodes, left and right areas are defined for each line element and are consistent throughout the file, and lines representing the limits of the file (neatline) are free of gaps.
The completeness of the data is unknown but should be consistent with the level of information normally shown on U.S. Geological Survey 1:24,000-scale topographic maps.
Attribute accuracy is tested by manual comparison of the source with hard copy plots and/or symbolized display of the digital line graph on an interactive computer graphic system. Through inspection and queries, attempts were made to ensure completeness and consistency of attribute values.
The updated sections (mainly around Kolonia and Sokehs) are accurate within a few meters, the other areas are accurate within about 20-30 meters.
Visual comparison with WorldView-3 satellite imagery.
Delete neatlines and mosaic hydrography DLGs for the island. Data processed by Connie Hoong choong@usgs.gov, 808-587-2427 USGS, 677 Ala Moana Blvd., Suite 415, Honolulu, HI, 96816
1. Shifted dataset to match new imagery better; 2. Extracted streams and rivers; 3. Adjusted streams to new shoreline; 4. Added names from the Geographic Names Information System (GNIS).
To include in the Digital Atlas of Micronesia - module Chuuk
The data for Federated States of Micronesia was downloaded from the GNIS website and further processed by Maria Kottermair, Island Research & Education Initiative (iREi) (Output: chk_placenames.shp)
Feature geometry.
ESRI
Coordinates defining the features.
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Source of original dataset.
The USGS document Standards for Digital Line Graphs, Part 3: Attribute Codes, contains a detailed description of each attribute code and a reference to the associated map symbols on the map source materials. The document is available at http://rockyweb.cr.usgs.gov/nmpstds/acrodocs/dlg-3/3dlg0798.pdf. Other DLG Standards are available from http://rockyweb.cr.usgs.gov/nmpstds/dlgstds.html.