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
- 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.
- Resample: Many of these require
to be installed.
- 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.
Last revised 2/3/2021