Changes between Version 3 and Version 4 of Processing/laguserguide


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Timestamp:
Apr 4, 2012 10:27:41 AM (8 years ago)
Author:
jaho
Comment:

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  • Processing/laguserguide

    v3 v4  
    2121    Using the fence allows loading selected part of the flighline(s) into LAG. If there's only a small area in the data that you need to see in full detail, it is a good idea to load the whole data using point skipping, then select the area of interest with the fence in the overview window and click refresh on the file opener dialog after checking the //Use Fence// button.
    2222* Resolution Base and Resolution Depth
    23     These two values control the construction of the quadtree and directly affect both loading times and rendering speed of the data. Each leaf (point bucket) in the quadtree can have a number of sub-buckets which store points to display at different zoom level. For example when viewing a whole flightline in the overview window there is no need to render every single point or store all the points in memory at once. Thus sub-buckets containing every n-th point are used instead.
    24     The Resolution Depth determines the number of sub-buckets for each bucket and Resolution Base determines the number of points at each level by specifying the interval between included points based on the formula of Resolution Base to the power of (Level - 1). For example the default values of 5 and 4 create 4 sub-buckets per bucket: first containing every point (5^0), second containing every 5th point (5^1), third containing every 25th point (5^2) and fourth with every 125th point (5^3).
     23    These two values control the construction of the quadtree and directly affect both loading times and rendering speed of the data. Each leaf (point bucket) in the quadtree can have a number of sub-buckets which store points to display at different zoom level. For example when viewing a whole flightline in the overview window there is no need to render every single point or store all the points in memory at once. Thus sub-buckets containing every n-th point are used instead. \\
     24    The Resolution Depth determines the number of sub-buckets for each bucket and Resolution Base determines the number of points at each level by specifying the interval between included points based on the formula of Resolution Base^(Level - 1)^. For example the default values of 5 and 4 create 4 sub-buckets per bucket: one containing every point (5^0^), second containing every 5th point (5^1^), third containing every 25th point (5^2^) and fourth with every 125th point (5^3^). \\
    2525    Adjusting these values should be done carefully and based on the density, volume and coverage of the data. Generally increasing the Resolution Base and decreasing Resolution Depth will result in faster loading and quadtree operations (eg. classifying), but less smooth rendering. Creating more and denser sub-buckets may improve the interaction with the GUI but at the cost of slower quadtree and bigger memory footprint.
    2626* Points to hold in cache
     
    3333    Pressing middle mouse button (scroll wheel) can be used for moving the camera at any time also with profile/fence/ruler enabled and can be used instead of zooming in and out to change the view.
    3434* WASD
    35     The WASD cluster can be used for moving the camera as well. The move speed can be changed in Advanced Options window. Additionaly:
    36     B, G - zooms in and out
    37     X - toggles the profile
    38     F - toggles the fence
    39     T - switches between orthogonal and slanted
    40     C - classifies selected points
    41     Z - refresh
    42     SPACE - loads currently selected profile into profile window
     35    The WASD cluster can be used for moving the camera as well. The move speed can be changed in Advanced Options window. Additionaly: \\
     36    B, G - zooms in and out \\
     37    X - toggles the profile \\
     38    F - toggles the fence \\
     39    T - switches between orthogonal and slanted \\
     40    C - classifies selected points \\
     41    Z - refresh \\
     42    SPACE - loads currently selected profile into profile window \\
    4343
    4444[[Image(advopts.png,align=center)]]