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{alias:oco}
h2. Name

*oco* — Orthogonal contours

h2. Syntax
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*oco* \[*frq* _frequency_] \[*col* _color_] \[*liw* _linewidth_] \[*bsp*] \[*nos*] \[*noadj*] \[*cur*] \[*nrg*] \[*dar*] \[*trm*] \[*ang*] \[*cod*] \[*cdc*] \[*cdr*] \[*chd*]  \[*split*] \[*src*] 

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h2. Description

Display orthogonal contours from grids and generate drainage areas. 

h2. Arguments

*frq* _frequency_ 
{indent}Indicates density of orthogonal contour lines. Default is 7. Lower number gives higher density.{indent} 
*col* _color_ 
{indent}Will be displayed in color _color_.{indent} 
*liw* _linewidth_ 
{indent}Will be displayed with linewidth _linewidth_.{indent} 
*bsp* 
{indent}Will smooth the lines with b-splines.{indent} 
*nos* 
{indent}Will not seek for the deepest region (which is default).{indent} 
*noadj* 
{indent}Will not adjust the lines to lay slightly above the grid.{indent} 
*cur* 
{indent}Will produce one ortho contour from the cursor position.{indent} 
*nrg* 
{indent}No regridding or decimation for large grids.{indent} 

+Drainage area calculation+
*dar* 
{indent}Will produce drainage areas (which is closely related to orthogonal contours).{indent} 
*trm* _number\_of\_nodes_ 
{indent}Remove drainage areas by minimum _number\_of\_nodes in areas.{indent} 
*ang* _angle_ 
{indent}Remove drainage areas lower than a certain angle between areas.{indent} 
*cod* 
{indent}Combine two drainage areas defined by the two latest cursor positions.{indent} 
*cdc* \[*lin*] \[*col* _color_] 
{indent}Calculate a closed drainage curve for an area defined by the latest cursor position. The result curve is saved in workspace +draincurve+. The curve is smoothed by a spline unless the *lin* argument is used. Color of the curve can be set by *col* and color selection.{indent} 
*cdr* \[*smo*] \[*col* _color_] 
{indent}Calculate closed drainage curves for all drainage areas. The result curves are saved in workspace +allcurves+. The curve is linear unless the *smo* is used. Color of the curves can be set by *col* and color selection.{indent} 
*chd* 
{indent}Change a drainage area defined by the cursor position. This has an expanding effect of the drainge area.{indent} 
*split* 
{indent}Split a drainage area along a line defined by the two last cursor positions just outside the drainage area at opposite positions.{indent} 
*src* 
{indent}The dataset in active is set as the source grid in drainage calculation.{indent}
 
h2. Examples

h3. Ex.1: Orthogonal contours and drainage areas

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