Data Manipulation Window

  The data manipulation window is accessible only from the main program file menu option or the main program toolbar. It presupposes a degree of knowledge about the data and some options may not be completely error trapped.  Opening most data sets no longer disables this window, but you should be very careful not to change an open data set.

This is a modal window; you must close it to revert to the other program options.

It allows the following options:

• File (to close window)
• Import: convert data into formats the program can use.
• Export: move data to format for other programs.
• Subset: create a smaller data set covering a smaller region.
  • LAS file: recursively quarter the LAS file, until all parts are smaller than specified size.  Depending on the aspect of the data set, it will be in corner quarters, or 4 tiles in the NS or EW direction.  This can speed up operations when you do not use the entire data set, and allows some operations to run in paralle.
  • DEMs: this lets you pick the corner coordinates, and subset a number of DEMs.  You might use this for a series of lidar grids over timel
  • Mask DEMs:  Pick a DEM to use as the mask, and then a number of DEMS to mask.  All points in the DEM to mask, for which there is not a valid point in the DEM to use as the mask, will be removed.  The masked DEMs will be stored in a "masked" directory, with just the region with valid data.
• Thin:
  • ASCII file.
• Resample:  Many of these require GDAL to be installed.
• Create/Index
• Edit
• Compress/Uncompress
• Download
  • List of URLs such as USGS National Map.  This fails with some files.  For those try the next two options, which is clunkier to use for a large number of files.
  • Chrome list, and then pick the text file.  The program will open Chrome, and put each into a tab, and download.  You will have to approve each download (quick CR), and it is unclear how many you can download at once (at least 17 works). This may be blocked by IT.
  • IE list, and then pick the text file.  The program will open Internet Explorer, and put each file request into a tab, and download.  You will have to pick "Save" for each file.  This may be allowed by IT, but might be less reliable than using Chrome.  You may be able to successfully resume the failed downloads (doesn't hurt to try), and you might crash IE.
• Delete: remove project, DEM, movie, or KML files from you hard disk. This will remove all associated files.
• Help

Last revised 2/3/2021