Scribd
Upload
82 views14 pages

Height Above The Nearest Drainage (HAND) : Icimod

The document discusses Height Above the Nearest Drainage (HAND), which normalizes a digital elevation model (DEM) according to local relative heights along drainage networks. This presents terrain topology and draining potentials. HAND is a hydrologically relevant new terrain model derived from DEMs, which allow calculations describing water storage and movement. HAND identifies potential flood inundation areas by showing elevations relative to the nearest drainage point.

Uploaded by

imm
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
82 views14 pages

Height Above The Nearest Drainage (HAND) : Icimod

The document discusses Height Above the Nearest Drainage (HAND), which normalizes a digital elevation model (DEM) according to local relative heights along drainage networks. This presents terrain topology and draining potentials. HAND is a hydrologically relevant new terrain model derived from DEMs, which allow calculations describing water storage and movement. HAND identifies potential flood inundation areas by showing elevations relative to the nearest drainage point.

Uploaded by

imm
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 14

Height Above the Nearest

Drainage (HAND)

ICIMOD

Mr. Kiran Shakya, Kiran.shakya@gmail.com


20 September 2016

International Centre for Integrated Mountain Development


Kathmandu, Nepal
HAND
Height Above the Nearest Drainage

The HAND model normalizes the DEM according to the local


relative heights found along the drainage network, and in this
way, presents the topology of the relative local draining
potentials.

location and spatial extent of potential inundation area during


Flood.
HAND
Height Above the Nearest Drainage

Digital Elevation Models (DEM): DEMs allow us to make


calculations to describe, understand and predict water
storage and movements.
DEM derived numerical descriptors:
Work area
Flow path
Accumulated contributing area
Drainage networks
HAND (Height Above the Nearest Drainage): Hydrologically
relevant new terrain model.
HAND
Height Above the Nearest Drainage
Digital Elevation Models
(DEM)
SINK in DEM

A sink is a cell or set of spatially connected cells


whose flow direction cannot be assigned one of
the eight valid values in a flow direction raster.
Fill SINK in DEM

Continuity in drainage network


Flow Direction

Creates a raster of
flow direction from
each cell to its
steepest downslope
neighbor.
Flow Direction
Flow Accumulation

Creates a raster of
flow direction from
each cell to its
steepest downslope
neighbor.
Drainage Network
HAND
HAND

You might also like