arcmappointpolygonpolyline-creationtracklog
I have a layer containing a few hundred points representing a survey track. The points are laid out in chronological order in the corresponding attribute table.
How can I have ArcMap 10 automatically "connect the dots" so that I essentially turn the points into a polyline representation of my survey track?
Thanks!
BTW, is there a way for me to specify a few of those points for ArcMap to IGNORE when it makes the polyline?
I am afraid you are missing the selection part with the feature layers. This is the workflow you are following:
Here is where the problem is: when user has made the selection in the map layer (i.e., the feature layer), you don't access this particular feature layer user has selections in. Instead, you create a new feature layer that comes from a geodatabase feature class. You are essentially never accessing the layer in the map.
This is what you need to do instead:
import arcpy
fields = ["Name","State_Name"]
mxd = arcpy.mapping.MapDocument("CURRENT")
lyr = arcpy.mapping.Layer("counties")
bCursor = arcpy.da.SearchCursor(lyr,fields)
for row in bCursor:
arcpy.AddMessage("County name: {0}; state name: {1}".format(row[0],row[1]))
The output in ArcMap session:
You use the Layer object that does contain the information on selections and its data source is the feature class where the actual attributes are retrieved. I suggest reviewing arcpy.mapping concepts at this Esri Help page.
Best Answer
Almost the same answer as Dano - his post references the one on ArcScripts. It was such a popular download this tool is included in the toolbox at 10.0
Points to Line: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000003s000000.htm
And you asked about doing an ignore.... just use a selection set of the points you actually want. The tool will connect based on a field (if you choose) only your selected points.