From http://www.3snews.net/bbs/viewthread.php? Tid = 3006 and http://blog.sina.com.cn/s/blog_4d0d397d0100aasm.html
Before applying data manually or automatically, check and correct various topology errors as required!
Geographic Data is massive and massive. errors can occur if it is artificial or automatic vectoring. For data with a large amount of data, checking and correcting errors is a tedious and complex task with a heavy workload.
Based on the past several years of exploration experience, we have summarized several methods for discussion. You are welcome to join in the discussion and correct me!
1. On the workstation, edit the check data. This method requires that the source data be coverage and be operated on a dark interface,
Although you can also set the editing menu, you still need to use a lot of commands in general, which is troublesome.
Step 1: Convert the file to the coverage format, go to the catalog, and set its capacity limits (set the tolerance item in the file attribute according to the precision requirements)
Second, do not: Go to arc to modify it!
Start the arc environment of workstation, enter AE (Note: arcedit), ec + (cov file path)
For specific command formats, enter help to view help
The command to display the hanging lines is: de arc node dangle; press ENTER
Nodec dangle 2 press ENTER
Disp999, enter
Draw, press ENTER
In this way, all the hanging lines are displayed in red for the connected line errors. Next, you only need to use the corresponding command to process and modify the lines!
We recommend that you perform build on the layer before the modification, so that many minor errors will be automatically processed back. Make sure to select the parameter!
2. load data such as a personal geographic database and use the topology function to automatically check for data errors
(This method can be implemented In arcmap with friendly interface and is suitable for modifying not many topology errors)
Start ArcCatlalog;
Select a local directory, right-click the directory, and choose create from the shortcut menu to create a personal GeoDatabase ";
Right-click the created GeoDatabase, and choose "New"> "dataset". Set the coordinate system of the dataset, if you are not sure, select the coordinate system of the data you want to analyze;
Right-click the dataset you just created and choose "Import element class inport -- feature class single" to import the data for topology analysis;
Select the dataset you just created, right-click the dataset, and choose create from the shortcut menu. In the displayed dialog box, create a topology and add a topology processing rule;
Topology analysis.
Finally, open the file generated by the topology rule In arcmap and modify the error record information in the topolopy toolbar.
Import the dataset to ARCMAP and click edit to edit the dataset.
Open the eidt drop-down menu and select more editing tools -- topology to display the topology editing toolbar.
Select the data to be topology and click the open error inspector button.
In the error inspector dialog box, click search now to locate all topology errors.
Mark as Exception for linear errors.
Check the polygon errors one by one. First, select the wrong small class, right-click and select zoom to, and then click merge. Select the appropriate graph class for merge processing, so that the small class information will not be lost.
Another statement:
Use catalog to create a personal geographic database and a new featuredataset
Import the shp file to featuredataset.
Right-click featuredataset and choose new topoloy data layer,
Click Next and select the imported shp layer. Next, add the topology check rules. This step is very important. You need to display broken lines, unattached lines, and early lines, select the corresponding topology rules! Click next after the selection.
Catalog generates a topology check layer file and uses arcmap to open the file.
You can see the error you need to display, so you can use the editing tool to modify it much more conveniently.
