Movendo um ponto por distância e rumo

Question

<\/HEAD>Eu tenho uma série de pontos ao longo de um transecto que precisam ser projetados a várias distâncias e direções a partir de onde o ponto foi registrado, cada ponto sendo diferente.<\/P> <\/P> Um exemplo da vida real é quando se realizam levantamentos de cervos para amostragem por distância, um transecto é percorrido de carro e, uma vez que um cervo ou grupo de cervos é observado, um waypoint é registrado, um medidor a laser é usado para medir a distância, e um rumo é tomado para obter uma localização exata. Como esses pontos podem ser movidos para mostrar a localização do animal sem criar novos pontos, se possível?<\/P> <\/P> Por favor, sem respostas com código.<\/P><\/BODY><\/HTML>

ChadKopplin · Answer

In your GPS unit are you should be able to perform an offset of your waypoint.  Also, I did find this tool, maybe it could help, because if you can use a distance tool to create this line then you could convert the line to points and be left with your survey points.

ArcGIS Desktop Help 9.2 - Creating lines with the Offset Line window

DarrenWiens2 · Answer

There are a few mistakes in the script above, which will make it tricky (impossible) for a beginning to figure out. Particularly, needs to be "math.radians()", and typo in newFc vs newFC, all of which is compounded by not using the 'with' statement, so sCursor never gets deleted and causes yet more problems. I guess the point is, sometimes the out-of-the-box tools are worth it.

>>> import arcpy # import arcpy
... import math # import math
... fc = r'C:\junk\start_points.shp' # change to your existing input feature class
... new_fc = r'C:\junk
ew_points.shp' # change to your existing output feature class
... fields = ['POINT_X', 'POINT_Y', 'DISTANCE','BEARING'] # existing fields in input
... outFields = ['SHAPE@','x', 'y', 'distance','bearing'] # existing fields in output
... iCursor = arcpy.da.InsertCursor(new_fc,outFields ) # insert cursor
... with arcpy.da.SearchCursor(fc, fields) as sCursor: # search cursor
...     for row in sCursor: # loop through rows in search cursor
...         inputX = row[0] # 1st field in search cursor
...         inputY = row[1] # 2nd field in search cursor
...         distance = row[2] # 3rd field in search cursor
...         bearing = row[3] # 4th field in search cursor
...         bearing = math.radians(float(bearing)) # convert to radians
...         newX = inputX + distance * math.cos(bearing) # calc new X
...         newY = inputY + distance * math.sin(bearing) # calc new Y
...         point = arcpy.Point(newX,newY) # create new point
...         temp = [point,newX,newY,distance,bearing] # organize new attributes
...         iCursor.insertRow(temp) # write new row
... del iCursor # delete insert cursor

DarrenWiens2 · Answer

You can do this all using out-of-the-box ArcGIS tools:

1.) You need a table containing the observation point coordinates, bearing, and distance. If you need to add coordinates, use Add XY Coordinates tool.

2.) Run Bearing Distance to Line​

3.) Use Add Geometry Attributes to calculate the END_X and END_Y coordinates

4.) Make XY Event Layer using the END_X and END_Y coordinates

5.) Export the event layer to a feature class on disk