home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!portal!lll-winken!uwm.edu!zaphod.mps.ohio-state.edu!howland.reston.ans.net!paladin.american.edu!darwin.sura.net!gatech!concert!sas!mozart.unx.sas.com!sch
- From: sch@unx.sas.com (Steve Holzworth)
- Newsgroups: misc.consumers.house
- Subject: Landscaping programs, some tips
- Message-ID: <sch.728088100@gargoyle>
- Date: 26 Jan 93 22:41:40 GMT
- Sender: news@unx.sas.com (Noter of Newsworthy Events)
- Organization: SAS Institute Inc.
- Lines: 40
- Nntp-Posting-Host: gargoyle.unx.sas.com
-
- A couple of comments: (I used to design high-end CAD packages for civil
- engineering and land planning, $50K a seat and up).
-
- To the guy that wants to measure and place his trees with a tape measure:
- Keep in mind that engineering maps and surveys are designed on a flat plane.
- When you measure to your trees, you have to account for any differences in
- elevations between your reference point and the measured point (presumably
- the base) of the tree. This distance (called the slope distance) will be
- greater than the plane distance on your map (if delta-elevation is fairly
- large). Simple trig will give you the plain distance; the program may also
- have an option to accept the distance as slope-distance. Your measured
- distance is the hypotenuse of a right triangle, with delta-elevation being
- one side. The plain distance is computed by solving for the other side of the
- triangle.
-
- Slow redraws:
- Most programs of this type allow you to turn off sets of features ("layers" in
- AutoCAD parlance), which will result in faster redraw times. Save a layer
- which is ONLY your lot lines, with maybe a key feature or two (house foot-
- print), then develop other layers as small groups of items on top of
- this base data (the bushes out front, the trees on the west side of the lot,
- the driveway, etc.). Only turn on the whole she-bang when you really need
- to see and/or plot everything.
-
- For a fairly level lot, two-foot contours may not be sufficient resolution
- to be useful, particularly near steep transitions (driveway cutout, swales).
-
- You can do a variant of the tape measure technique above, but also drag
- a water level with you. You can then establish the relative elevation change
- at the point you're measuring. You may have to attach a rule to the water level
- to get sufficient elevation range (most only measure a foot or so).
-
-
-
- --
- Steve Holzworth
- sch@unx.sas.com "Do not attribute to poor spelling
- x6872 That which is actually poor typing..."
- SAS Institute - Open Systems R & D - me
- Cary, N.C.
-