c305ae32-fe68-4304-a389-28fd6b500522
eng
utf8
dataset
HydroSHEDS (World Wildlife Fund / U.S. Geological Survey)
originator
2026-09-17
ISO 19115:2003/19139
1.0
EPSG:3857
EPSG
geometryOnly
surface
46
Asia HydroBASINS Level 6 Sub-basins – Lao PDR Extract (v1c)
2013-01-01
creation
2026-05-13
publication
HydroSHEDS (World Wildlife Fund / U.S. Geological Survey)
originator
Level 6 sub-basin polygons for the Asia region (hybas_as_lev06_v1c) from the global HydroBASINS dataset (Lehner & Grill, 2013), clipped/extracted to Lao PDR, and delivered as part of the GeoCLEAR baseline data package. HydroBASINS provides seamless, hierarchically nested sub-basin boundaries derived from 15 arc-second HydroSHEDS hydrography, using the Pfafstetter coding system to encode up/downstream connectivity between sub-basins; at this level of breakdown, sub-basins typically average around 130 km² globally, though the delivered extract's 46 sub-basins are larger because Level 6 groups more sub-basins together than Level 12 (the highest-resolution level, where the 130 km² global average applies). Basin polygons do not align to national borders, so this extract extends slightly beyond Lao PDR's boundary.
To provide the hydrological sub-basin delineation used for the village clustering process under the GeoCLEAR project: CLEAR and the United Nations Satellite Centre agreed to use HydroBASINS Level 6 as the basin unit for grouping villages into clusters, and this layer was clipped to Lao PDR only for that purpose.
HydroSHEDS (World Wildlife Fund / U.S. Geological Survey)
originator
notPlanned
HydroBASINS
HydroSHEDS
sub-basin
watershed
Pfafstetter coding
village clustering
GeoCLEAR baseline reference
theme
Lao PDR
Laos
Asia
place
otherRestrictions
otherRestrictions
HydroBASINS/HydroSHEDS data are made available by WWF and USGS for free use; users citing this dataset should reference Lehner, B., Grill G. (2013): Global river hydrography and network routing: baseline data and new approaches to study the world's large river systems. Hydrological Processes, 27(15): 2171-2186. [Exact current license terms (e.g. CC BY 4.0) were not confirmed from the bundled HydroBASINS.pdf — please verify against the HydroSHEDS website/license page before redistribution if that matters for this delivery.]
The United Nations Satellite Centre is not the originator of this dataset and distributes it, clipped to Lao PDR, unmodified otherwise, as part of the GeoCLEAR baseline data package.
vector
eng
inlandWaters
planningCadastre
99.224433
108.546375
13.541667
24.9375
true
hybas_as_lev06_v1c_LAO attribute definitions
2013-01-01
creation
dataset
Global HydroBASINS Level 6 polygons for the Asia region (hybas_as_lev06, version 1c) were produced by HydroSHEDS (WWF/USGS) from 15 arc-second HydroSHEDS hydrography using Pfafstetter basin coding (Lehner & Grill, 2013). The full Asia dataset (hybas_as_lev01-12_v1c.zip, also included in this delivery folder) was clipped to Lao PDR and exported to shapefile via ArcGIS Pro (ExportFeatures, 2026-05-13), reprojected to Web Mercator (EPSG:3857) in the process. Original global dataset created 2014-07-25 per the source file's metadata.
ESRI Shapefile
1.0
United Nations Satellite Centre (part of UNITAR)
unosat.bangkok@unitar.org
pointOfContact
HYBAS_ID
Unique identifier of the sub-basin polygon (HydroBASINS ID coding scheme).
NEXT_DOWN
HYBAS_ID of the next sub-basin immediately downstream; 0 if this sub-basin has no downstream connection within the dataset (terminal or coastal outlet).
NEXT_SINK
HYBAS_ID of the terminal sub-basin (final sink — ocean outlet or closed inland basin) along this sub-basin's downstream flow path.
MAIN_BAS
HYBAS_ID of the main basin (the most downstream/outlet sub-basin) that this sub-basin ultimately drains into.
DIST_SINK
Along-river distance from this sub-basin's pour point to the terminal sink, in kilometers.
DIST_MAIN
Along-river distance from this sub-basin's pour point to the main basin's outlet, in kilometers.
SUB_AREA
Area of this individual sub-basin polygon, in square kilometers.
UP_AREA
Total upstream drainage area accumulated to this sub-basin's pour point, in square kilometers.
PFAF_ID
Pfafstetter hierarchical coding system identifier, encoding the sub-basin's position and connectivity within the global basin nesting hierarchy.
ENDO
Endorheic-basin flag (1 = sub-basin drains to an internal/closed basin with no outlet to the ocean; 0 = otherwise).
COAST
Coastal-basin flag (1 = sub-basin drains directly to the coast/ocean; 0 = otherwise).
ORDER_
Sub-basin hierarchical order/level indicator used in HydroBASINS processing. [Precise definition per the official HydroBASINS technical documentation was not confirmed from the bundled HydroBASINS.pdf, which is a general product overview rather than a field-by-field data dictionary — flagged for cross-check if precision matters.]
SORT
Internal sorting index used to order sub-basins for hierarchical/topological processing. [Not documented in the bundled HydroBASINS.pdf — flagged.]
Esri ArcGIS 13.7.0.1901
hybas_as_lev06_v1c_LAO
hybas_as_lev06_v1c_LAO
002
Projected
GCS_WGS_1984
Linear Unit: Meter (1.000000)
WGS_1984_Web_Mercator_Auxiliary_Sphere
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20261101
14061800
20261101
14061800
20261101
16554100
1.0
TRUE
File Geodatabase Feature Class
dataset
EPSG
6.18.3(9.3.1.2)
0
Simple
FALSE
0
TRUE
FALSE
hybas_as_lev06_v1c_LAO
Feature Class
0
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
0
0
0
Feature geometry.
Esri
Coordinates defining the features.
HYBAS_ID
HYBAS_ID
Double
8
0
0
Shape_Length
Shape_Length
Double
8
0
0
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
Shape_Area
Shape_Area
Double
8
0
0
Area of feature in internal units squared.
Esri
Positive real numbers that are automatically generated.
20261101