Hi,

I have a forestry square plot of 30m, with sides called A, B, C, & D. I know the co-ordinates for both ends of side A. For every tree within the plot, I have a measurement for the distance to both ends of side A. I wish to know the co-ordinates of every tree.

Is there a way for ArcGIS to calculate this? I don't have Spatial Analyst, though do have the ET add-ins.

Regards, Mick.

I have a forestry square plot of 30m, with sides called A, B, C, & D. I know the co-ordinates for both ends of side A. For every tree within the plot, I have a measurement for the distance to both ends of side A. I wish to know the co-ordinates of every tree.

Is there a way for ArcGIS to calculate this? I don't have Spatial Analyst, though do have the ET add-ins.

Regards, Mick.

See ArcGIS help: http://resources.arcgis.com/en/help/main/10.1/index.html#/at_the_intersection_of_two_distances/01m700000032000000/

If you have many trees it will be slow. Maybe with a python script you can get the same result but with many more steps.

I don't know exactly what's the structure of you data but inside your script you need to convert your plot vertices to points. Each point must have the distance to your tree. Then create a buffer for each point using that distance field for the radius of the buffer. The intersection of the buffers for each vertex of side A (falling inside the plot) is the location of your tree. With the Intersect tool, changing the output feature class type to point, you will get the tree location.