Take the 2-minute tour ×
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It's 100% free, no registration required.

I have a polygon shapefile. I want to create points at an interval of 0.125 decimal degrees in this polygon. How can I create a script with python in ArcGIS 10 to automate the process of create points? The start point is the south-west corner and the end point is north-east of the polygon.

share|improve this question

2 Answers 2

up vote 5 down vote accepted

If you're interested in additional vertices along your polygon feature, you can use the built-in Densify function:

import arcpy
arcpy.Densify_edit("polygon.shp", "DISTANCE", "0.125")
share|improve this answer
    
densify only divide borders of polygon . –  wetland May 17 '11 at 9:45

You already have your answer; you have your start X/Y and finish X/Y, so you have a range and the distance between the points

Calculate the amount of points you will create per axis

xRange = maxX - minX

yRange= maxY - minY

xloop = int(xRange /0.125)+1

yloop = int(yRange /0.125)+1

Create your point variables

pointGeometryList = []

point = arcpy.Point()

Set the start point

point.Y = minY

point.X = minX

for y in range(0,yLoop):
....for x in range(0,xLoop):

add a point to your point array

........pointGeometry = arcpy.PointGeometry(point)

........pointGeometryList.append(pointGeometry)

move along the x axis and create a point per 0.125 degrees

........point.X = point.X + 0.125

once the xloop has finished, reset X

....point.X = minX

and move the yaxis up 0.125

....point.Y = point.Y + 0.125

create the point feature

arcpy.CopyFeatures_management(pointGeometryList, "c:/geometry/a.gdb/points")

Please note, this si off the top of my head and completely untested, so I am not responsible for it if you use it. However, that should, I think, start you off.

You will have created points outside of the polygon, as I have ensured the MBR is properly represented; you may want to erase features outside of the polygon afterwards.

share|improve this answer
    
+1 Whether it works as-is or not, it's a clear, complete account of the algorithm and of the steps needed to make it work in ArcGIS. –  whuber May 19 '11 at 16:00

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.