| Title
|
Rivers in Central America (Derived from HydroSHEDS) |
| Date
|
2009-11-04T00:00:00 |
| Date type
|
Creation: Date identifies when the resource was brought into existence
|
| Edition
|
First edition. |
| Presentation form
|
Digital map: Map represented in raster or vector form
|
| Abstract
|
The rivers of Central America are derived from the World Wildlife Fund's (WWF) HydroSHEDS drainage direction layer and a
stream network layer. The drainage direction layer was created from NASA's Shuttle Radar Topographic Mission (SRTM) 15-second
Digital Elevation Model (DEM). The raster stream network was determined by using the HydroSHEDS flow accumulation grid, with
a threshold of 500 upstream cells.
The stream network dataset consists of the following information:- unique arc identifier (ARCID), the origin node of each
arc in the network (FROM_NODE), the destination of each arc in the network (TO_NODE), the Strahler stream order of each
arc in the network (STRAHLER), numerical code and name of the major basin that the arc falls within (MAJ_BAS and MAJ_NAME);
- area of the major basin in square km that the arc falls within (MAJ_AREA); - numerical code and name of the sub-basin
that the arc falls within (SUB_BAS and SUB_NAME); - area of the sub-basin in square km that the arc falls within (SUB_AREA);
- numerical code of the sub-basin towards which the sub-basin flows that the arc falls within (TO_SUBBAS) (the codes -888
and -999 have been assigned respectively to internal sub-basins and to sub-basins draining into the sea).
|
| Purpose
|
To provide a river network with annotated attributes. The dataset is developed as part of an assessment of water resources
in Central America. It is also our intent to eventually include an "Intermittent" or "Perennial" value for each arc in the
dataset.
|
| Status
|
On going: Data is continually being updated
|
| Descriptive keywords
|
rivers , river basins , water resources , hydrology , AQUASTAT , fishery , AQUAMAPS_rivers (theme). |
| Descriptive keywords
|
Central America (place). |
| Spatial representation type
|
Vector: Vector data is used to represent geographic data
|
|
|
| Language
|
English |
| Character set
|
UTF8: 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646
|
| Topic category code
|
Geoscientific information |
|
|
| Supplemental Information
|
This dataset is developed as part of a GIS-based information system on water resources for the Central American continent.
It has been published in the framework of the AQUASTAT - programme of the Land and Water Division of the Food and Agriculture
Organization of the United Nations.
|
