GIS Structures

Three candidates are available for EDA

When comparing surface layers for ECRINs and CCM for the bassin Loire-Bretagne : the CCM layer is more extended than the Ecrin Layer

describing the CCM layers

gid::

id (corresponds to line number)

wso1_id::

id of the primary catchment drained by the river segment.

wso_id::

id of the Sea-outlet to which the river segment belongs.

rvr_id::

reference of the name of the river to which the segment belongs (often 0)

fromnode::

upstream node

tonode::

downstream node

strahler::

the stream order hierarchy, the sizes range from a first order stream to the largest a 11th order stream

pfafstette::

Pfafstetter code (?) of the river segment and its primary catchment

nextdownid::

next segment identifyer downstream points to wso_id

longpath::

identifies wether the river segment is part of the longest flow path in the River Basin (sea-outlet), Y(es) or NULL

maindrain_::

?

maindrain1::

?

length::

length of a river segment in meters

cum_len::

cumulated length of the upstream flow network, including the river segment itself (longest route ?)-in meters

pixels_100::

area directly drained by the river segment (area of the primary catchment), in 100m*100m grid-cells

catchment_::

?

cont_pixel::

area upstream of the From Node drained by the river segment in 100m*100m grid-cells

drain_km2::

full area drained by the river segment and upstream area - in square kilometres

alt_gradie::

relief Energy of the river segment : ((Elevation at From Node-Elevation at ToNode?)/Segment Length)*100 in per cent

burned::

percentage grid-cells of the river segment having a high confidence level with respect to its geographical position confidence

percentage of grid-cells of the river segment having a high confidence level with respect to its geographical position

window::

here 2003

shape_leng::

?

the_geom::

the_geom

[Image(source:"EDA/data/Docs/trac/Comparaison CCM-Ecrins-BDCarthage.jpg")]