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ingeoquad

True for points inside or on lat-lon quadrangle

Syntax

tf = ingeoquad(lat, lon, latlim, lonlim)

Description

tf = ingeoquad(lat, lon, latlim, lonlim) returns an array tf that has the same size as lat and lon. tf(k) is true if and only if the point lat(k), lon(k) falls within or on the edge of the geographic quadrangle defined by latlim and lonlim. latlim is a vector of the form [southern-limit northern-limit], and lonlim is a vector of the form [western-limit eastern-limit]. All angles are in units of degrees.

Examples

  1. Load elevation data and a geographic cells reference object for the Korean peninsula. Display the data on a world map. Apply a colormap appropriate for elevation data using demcmap.

    load korea5c
    figure('Color','white')
    worldmap([20 50],[90 150])
    geoshow(korea5c,korea5cR,'DisplayType','texturemap');
    demcmap(korea5c)
    

  2. Outline the quadrangle containing the elevation data:

    [outlineLat, outlineLon] = outlinegeoquad(korea5cR.LatitudeLimits, ...
       korea5cR.LongitudeLimits,90,5); 
    geoshow(outlineLat,outlineLon,'DisplayType','line', ...
       'Color','k') 
  3. Generate a track that crosses the elevation data:

    [lat,lon] = track2(23,110,48,149,[1 0],'degrees',20);
    geoshow(lat,lon,'DisplayType','line')

  4. Identify and mark points on the track that fall within the quadrangle outlining the elevation data:

    tf = ingeoquad(lat,lon,korea5cR.LatitudeLimits, ...
                           korea5cR.LongitudeLimits);
    geoshow(lat(tf),lon(tf),'DisplayType','point')

Introduced in R2008a