Latest Contributions by PhilFreeman

I am new to using these files and want to clip one using a polygon.  I thought the Extract LAS tool in 3D analyst would accomplish this.  When I try it, the tool gives no indication of an error and I obtain output, but the extent of the output .las file is the same as that of the input file.  Neither of them will draw on the screen, but I assume that is because of the huge number of data points.  I am using version 10.6 of ArcMap.  The input file has been classified.  Would that make a difference?  I assume I am overlooking something simple but just can't spot it.  Thank you.  ... View more

This symbol is used on maps to show that a polygon (forest stand, ownership, etc.) crosses a line (road, etc.).  I want to  use it on maps I create in ArcMap 10.6 but I can't find it as a line type in any of the styles  have looked through.  I want it to work like the line with an arrow on each end that you just draw with the Draw Toolbar.  Can you point me to where I can find this?  Many thanks. Phil Freeman ... View more

I an running ArcGIS 10.4 on Windows 10.  Today, out of the blue, when I try to open the program, I get a popup message that tells me that there are problems with two drivers, DisplayLib.dll and LayerULIB.dll .  When I look at those files they both have sizes of 0 bytes.  Any help would be greatly appreciated. Phil Freeman ... View more

I have ArcMap skills that are on the low end of "intermediate" and do volunteer work for a non-profit conservation organization.  I have what I think is a conceptually simple problem, but so far haven't found an automated practical solution: Within a forested area with flat terrain, I have a point location where I want to provide full sunlight. Assume the surrounding forest is of uniform height.  NOAA  has a website which will calculate the position of the sun - both azimuth and height above the horizon - for any day and time given the latitude and longitude of the site.  The site provides spreadsheets that include the calculations.  I want the point to receive 100% of available sunlight from May 15-Sept 30, and I wish to calculate and map the extent of forest that must be cleared to provide this sunlight.  If the tree height is 65 feet and X is the distance from the point for which all the trees must be cut, then I believe (please correct me if I am in error) that X for a date and time can be simply calculated by dividing 65 by the tangent of the angle of the sun's elevation above the horizon at that moment.  The resulting solution will be the extent of clearing needed on that date at an azimuth from the point equal to the azimuth of the sun's location at that time on that date.  For this purpose I can ignore the small differences year-to-year in the sun's position on a given date.  So, conceptually, all I would need to do is apply the NOAA data to perform these calculations for each day between May 15 and Sept. 30 during the daylight hours at some time interval - maybe 5 or ten minutes.  For a given date and time, I could then use an ArcMap tool to create a point x distance from the point of interest at the calculated azimuth.  Starting at about due east and working clockwise to about due west, I would then determine the greatest plotted distance X by some rounded azimuth interval, connect the resulting points and have a map of the extent of clearing needed.  Conceptually simple but impractical due to time required.  Given that solar installers need to solve this problem routinely, I think somebody surely has created an ArcMap tool to do this, but I can't find it.  Can anybody help me with this?  I would greatly appreciate it.   Here's the link to the NOAA site:  http://http://www.esrl.noaa.gov/gmd/grad/solcalc/ ... View more