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'. |
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. |
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). |
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... |
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. |
| 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. |