I am working on my project as urban planner research student on HO chi Minh City in Vietnam. I took the high resolution google earth map by Universal map downloader software, I added in Arcmap, and when I am creating the shapefile for drawing poligon there is an error said:" the feature could not create, the geometry is invalid"
Is anyone knows how can I solve this problem?
I restart the programm too many times, also I tried repair geometry in Arctool!
But nothing changed.
Please guide me how can I solve this.
Solved! Go to Solution.
trying to nail it down
what type of geometry? point, polyline, polygon?
can you create other geometries?
do you have a defined coordinate system?
since you are creating a shapefile, are you saving it to a local disk and not a usb drive or some other location?
details would help
Actually I started to create the Polygon.
I have a defined Coordinate system after georefrencing my google earth base map picture. I defined it, Then I defined the same for the shapefile as well!
I am saving it on my computer folders, not on Usb!
I can create Point and Polyline, just with polygon I have this problem!
trying to nail it down
I georefrenced it according to the lat and lon that I had. the I define the project coordinate system is: WGS_1984_UTM_Zone_48N
Actually I am going to draw simple shapes like rectangle, as well as shape of the water body in the city!
I am doing the shape clockwise and it doesn't work for the small polygons! it is ridiculous that when I make a big and simple polygon like rectangle that it is really huge it works, but when I am going to draw the real shapes like the shapes of buildings or river, I cannot because it doesn't allow me and before finishing the drawing the error appears.
If the coordinates were in lat long, you just can't define them in another coordinate system...You have to project them when you are done. This step is commonly missed. You cannot make something into what you want it to be...it must be created first then changed into something new via the projection process.
So do your digitizing in whatever coordinate system, you base image is in. When you are done you can use the Data Management Tools, Projections and Transformations toolset, Project tool .... NOT the Define Projection.
Another issue is that of the coordinate reference definition. If you've mashed something together, you might have an X/Y precision of which is larger than the size of your features. One way to detect this is if you make rectangles of progressively smaller area (10% shrinkage) and look to see if they start distorting before collapsing completely.