Changes between Version 137 and Version 138 of UvmatHelp


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Timestamp:
Jan 14, 2015, 12:34:36 PM (6 years ago)
Author:
vaillant1p
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  • UvmatHelp

    v137 v138  
    480480Each field variable yields a corresponding variable with the same name in the projected field. Integral quantities (circulation, flux...) can be also calculated. The result of projection depends on the object type, the nature of the coordinates, the ''Role'' of field variables and on the projection mode '''!ProjMode''':
    481481
    482  * ''' !ProjMode = 'projection':  '''  this is a normal projection  of the field data in a range of action around the object, as defined by the parameters '''[RangeX], [RangeY], [RangeZ]'''. The projection of an input variable defined on unstructured coordinates therefore remains unstructured. By contrast, an input variable defined on a regular grid always yields a projected variable on a regular grid (for instance on a line or plane). Error flags ?
     482 * ''' !ProjMode = 'projection':  '''  this is a normal projection  of the field data in a range of action around the object, as defined by the parameters '''[RangeX], [RangeY], [RangeZ]'''. The projection of an input variable defined on unstructured coordinates therefore remains unstructured. By contrast, an input variable defined on a regular grid always yields a projected variable on a regular grid (for instance on a line or plane). Data marked as false are projected, with their error flag, only for 'plane' or 'volume'.
    483483   * 'points': each field variable is averaged in a sphere of radius '''[RangeY]''' ('''Max''') around each projection point and attributed to this point position. The number of (non-false) data found around each point  #i is recorded in the vqriable  U_nbval(i). Ancillary data and warning flags are not projected on points.
    484484   * 'line': for scattered coordinates, each initial data point within a range '''[RangeY]''' on each side of the line is normally projected on the line, keeping its field values. For grid lin interpolation and averaging.  Vector quantities are furthermore projected on the line as longitudinal (X) and normal (Y) components. The line length and mean value of each variable along the line is also calculated (giving access to circulation and flux). Ancillary data and warning flags are not projected on points.
    485    * 'plane': similar as line, RangeZ in 3D. RangeX and RangeY used to set bounds. All data are projected in this mode.
    486    * 'volume': used to set bounds in 3D within a box [RangeX, RangeY, RangeZ].  All data are projected in this mode.
    487    * no action on 'polyline', 'rectangle', 'polygon', 'ellipse'.
    488 
    489  * ''' !ProjMode = 'interp_lin': '''  Linear interpolation of scalar and vector field variables, after exclusion of false data (marqued by error flag). Ancillary data and warning flags are not projected in this mode. Gridded data are interpolated by ..., while fields with scattered coordinates are projected with the Matlab function .... Note that this function provides interpolation only within the convex hull of the initial data set, attributing 'NaN' (undefined) field values out of this domain. To avoid problems with further data processing, UVMAT transforms NaN values into zeros, but mark them with an error flag FF=1.
     485   * 'plane': similar as line, RangeZ in 3D. '''[RangeX]''' and '''[RangeY]''' used to set bounds. All data are projected in this mode.
     486   * 'volume': used to set bounds in 3D within a box '''[RangeX, RangeY, RangeZ]'''.  All data are projected in this mode.
     487   * 'polyline', 'rectangle', 'polygon', 'ellipse': no action.
     488
     489 * ''' !ProjMode = 'interp_lin': '''  linear interpolation of scalar and vector field variables, after exclusion of false data (marked by error flag). Ancillary data and warning flags are not projected in this mode. Gridded data are interpolated by ..., while fields with scattered coordinates are projected with the Matlab function .... Note that this function provides interpolation only within the convex hull of the initial data set, attributing 'NaN' (undefined) field values out of this domain. To avoid problems with further data processing, UVMAT transforms NaN values into zeros, but mark them with an error flag FF=1.
    490490   * 'points': linear interpolation on each point of the object.
    491    * 'line','polyline', 'rectangle', 'polygon', 'ellipse': linear interpolation on points regularly spaced on the line, with mesh DX. The X coordinate is the distance following the line, with an origin at the starting point(the first point in 'line','polyline','polygon',the lower left corner for rectangle, the point along the main axis for an ellipse). The line length and mean value of each variable along the line is also calculated (giving access to circulation and flux).
     491   * 'line', 'polyline', 'rectangle', 'polygon', 'ellipse': linear interpolation on points regularly spaced on the line, with mesh DX. The X coordinate is the distance following the line, with an origin at the starting point(the first point in 'line','polyline','polygon',the lower left corner for rectangle, the point along the main axis for an ellipse). The line length and mean value of each variable along the line is also calculated (giving access to circulation and flux).
    492492   * 'plane': linear interpolation on a regular grid with meshes DX, DY and ortigin at (X,Y)=(0,0). This grid is bounded by the two values of RangeX and RangeY along X and Y respectively.
    493493
    494  * ''' !ProjMode = 'interp_tps':  '''  This behaves with different objects line 'interp_lin', but using the more precise thin spline shell method. This is particularly usefull to calculate spâtial field derivatives. Furthermore this method provides data exrtrapolation outside the initial convex hull (although it is not reliable at large distances). This mode does require a previous calculation of tps weights, see [#a5.1Gridingofdata section 5.1], so it does not act on the initial field cells with scattered coordinates. This is done by UVMAT if tps projection is requested. Gridded data are linearly interpolated (to clarify...).
    495 
    496  * ''' !ProjMode = 'inside' and 'ouside '''': defined only for closed lines: rectangle, polygon, ellipse. For each field U, its probability distribution function Uhist  inside, or respectively outside,  the line is calculated, as well as the mean Umean. other statistics...
     494 * ''' !ProjMode = 'interp_tps':  '''  this behaves with different objects line 'interp_lin', but using the more precise thin spline shell method. This is particularly usefull to calculate spâtial field derivatives. Furthermore this method provides data exrtrapolation outside the initial convex hull (although it is not reliable at large distances). This mode does require a previous calculation of tps weights, see [#a5.1Gridingofdata section 5.1], so it does not act on the initial field cells with scattered coordinates. This is done by UVMAT if tps projection is requested. Gridded data are linearly interpolated (to clarify...).
     495
     496 * ''' !ProjMode = 'inside' and 'ouside '''': defined only for closed lines: rectangle, polygon, ellipse. For each field U, its probability distribution function Uhist  inside, or respectively outside,  the line is calculated, as well as the mean Umean (after exclusion of data marked as false). other statistics...
    497497
    498498 * ''' !ProjMode = 'none', 'mask_inside', 'mask_outside': ''' no projection operation. The object is used solely for plotting purpose, to show a boundary or to prepare a mask, inside or outside a closed line, see [#a9-Masksandgrids section 9]).
     
    654654First open an input image file name with the browser, or the edit box and carriage return. From the image name, a corresponding mask name is proposed in the lower edit box. It should be edited if a series of masks is made, in case of mutipositions (number nbslices) of the laser sheet in a series. The names must be [filebase '_xxmask' 'filenumber' '.png'], where xx is the number of masks (nbslices). The mask filenumber used is the image field number modulo nbslices. The filenumber can be incremented by the NEXT press button.
    655655
    656 Holes can be made by the press button mask_hole which allows to draw a polygon on the image (the matlab image processing toolbox is needed). The inside of this polygone is masked.
     656Holes can be made by the press button mask_hole which allows to draw a polygon on the image (the matlab image processing toolbox is needed). The inside of this polygon is masked.
    657657
    658658Press the red push button  save_mask which appeared on the lower right. The saved mask is then displayed. A new image can be then entered.
    659659
    660660=== 9.2 Grids ===
    661 Grid files, see [#MaskGrids section 3.6], are used to impose a set of positions for PIV vectors. To create a grid for PIV, activate the menu bar Tools/Make grid on the GUI UVMAT. Introduce a minimum value, mesh, and maximum value for coordinate x in the edit boxes XMin, DX, XMax respectively. Do the same for the y coordinate.  This must be expressed in physical coordinates.
     661Grid files, see [#MaskGrids section 3.6], are used to impose a set of positions for PIV vectors. To create a grid for PIV, activate the menu bar Tools/Make grid on the GUI '''uvmat'''. Introduce a minimum value, mesh, and maximum value for coordinate ''x'' in the edit boxes '''[XMin], [DX], [XMax]''' respectively. Do the same for the ''y'' coordinate.  This must be expressed in physical coordinates.
    662662
    663663The grid will be limited to an  image , or to the common region of two images, depending whether one or two image names are indicated in the edit boxes image_1 and image_2. Press save to save the corresponding grid file (s). A dialog box appears to edit the name of the output grid file, and a second one in case of two images.