[UW-GIS-L] Georeferencing Points

[Michael Hannam]

Since you have 3 points, you might want to fit a line to the points, and the place your transect samples on the fit line.  This way you are not throwing out the third geographic datum in each transect. 

Then you would still have to do the trig, I guess....

Michael Hannam
Ph.D. Student
UW Botanic Gardens
College of the Environment
University of Washington
Box 354115
Seattle, WA 98195-4115

mhannam at u.washington.edu





On Jan 12, 2010, at 3:08 PM, Jeff Richardson wrote:


> I think I can handle trig (just barely!). Thanks for the help.

> 

> 

> Jeff Richardson

> 

> 

> 

> On Tue, Jan 12, 2010 at 3:06 PM, Harvey Greenberg <hgreen at u.washington.edu> wrote:

> I have handled transects by reading ascii coordinates into python, doing the trig and algebra there, and importing into arcmap as events.  Yes, excel works too.  Use whichever is more fun.

> 

> harvey

> 

> Jeff Richardson wrote:

> Howdy,

> 

> I'm wondering if there is a relatively simple way to do this: I have a dataset consisting of points taken along a 10 m transect. I've recorded the position along the transect and the distance away from the transect in either direction. I have GPS coordinates for three points along the transect. Now I want to georeference all the points in the transect using the three GPS points.

> 

> Any ideas?

> 

> Thanks

> 

> 

> Jeff Richardson

> PhD Student

> School of Forest Resources

> 

> 

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> 

>        Harvey Greenberg

>        University of Washington

>        Department of Earth and Space Sciences

>       College of the Environment

>        Box 351310

>        Seattle WA 98195-1310

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