TRACKEXTRACT Extracts alongtrack altimetry segments within given region. TRACKEXTRACT is designed to extract alongtrack altimeter data from the file TPJAOS.MAT within a specified latigude and longitude region. See ABOUT_TPJAOS for more details on that dataset. [LAT,LON]=TRACKEXTRACT(LAT,LON,REGION) where the input LAT and LON are matrices of latitude and longitude, outputs the sub-matrices LAT and LON that are contained entirely within REGION. REGION is an array with the format [WEST EAST SOUTH NORTH]. Longitudes may either be specified on the interval [-180, 180] or on [0, 360]. Locations of the input LAT and LON within REGION are found on a column- by-column basis. Those columns having data within the region are included in the output LAT and LON, while the others are excluded. The columns of the output are padded with NaNs at their trailing end to make them all the same length. Their length is such that the column having the most number of data points in REGION will contain no NaNs. TRACKEXTRACT with no output arguments overwrites the original named output variables. __________________________________________________________________ Additional input arguments [LAT,LON,SSH]=TRACKEXTRACT(LAT,LON,SSH,REGION) where SSH is a 3D array with its first two dimensions matching the input LAT and LON, also extracts the corresponding portions of this array. In this case, the output SSH will have the same number of rows and columns as the output LAT and LON, and the same number of "pages" or elements in the third dimension as the input SSH. [LAT,LON,X1,X2,...,XN]=TRACKEXTRACT(LAT,LON,X1,X2,...,XN,REGION) with multiple input arguments also works. __________________________________________________________________ Composite regions REGION is passed directly to the function INREGION. Thus, REGION can also be a cell array built up from several region boxes. See INREGION for more details on this option. __________________________________________________________________ Specifying length cutoff [LAT,LON,...]=TRACKEXTRACT(LAT,LON,,...,REGION,LMIN) only returns those track segments containing LMIN or more points. The default is LMIN=0. __________________________________________________________________ See also INREGION, REGIONPLOT, TRAJEXTRACT. 'trackextract --f' generates a sample figure for the Labrador Sea. Usage: [lat,lon]=trackextract(lat,lon,region); [lat,lon,ssh]=trackextract(lat,lon,ssh,region); [lat,lon,ssh,mss,atd]=trackextract(lat,lon,ssh,mss,atd,region,200); trackextract(lat,lon,ssh,region,200); __________________________________________________________________ This is part of JLAB --- type 'help jlab' for more information (C) 2015--2016 J.M. Lilly --- type 'help jlab_license' for details