A summary of the editing of Chinese and foreign industry locus in geographical conditions

The external trajectory is very confusing and the editorial workload is very large.

We can simplify the trajectory with the help of "break intersection lines" in advanced editing in ArcGIS to improve efficiency, and the tolerance values need to be tried repeatedly until the best.

But the results are not always ideal for each place, especially where the roads are wide (there are multiple tracks on the road) and need to be edited manually.

This is the result of manual editing of the entire project.

The techniques and questions in the editing process are summarized as follows:

(1) Calculate the point of repetition

For reasons such as software positioning, there are two duplicate points in the same location, and duplicate points need to be removed. You can calculate the X value of its point coordinate and delete it by marking duplicate values. The Python code is as follows:

Pre-Logic scripts:

Uniquelist = []def isduplicate (invalue): If invalue in Uniquelist:return 1else:uniquelist.append (inValue)

Call Mode:

Isduplicate (! Field name!)

(2) Sub-batch deletion

Because the point data is more, can not be deleted all at once, or it will be stuck, you can try to delete some part, as to the amount of a deletion, with the computer configuration.

(3) Marking the line of finishing

During the editing process, you need to constantly look at the profile of the track line, draw time and other information. (There are several tracks on a road that are the earliest of the time) so it's important to do a good job of labeling different colors to improve productivity.

(4) Determine the direction of the line

Select the symbol with arrows to display the path, so that you can see the direction of operation of the painting, greatly facilitate the collation of the trajectory.

(5) The interrupted line is connected

Due to the bad information, there is a significant interruption of this trajectory, which can only be manually connected, so that it has connectivity.

(6) node too many lines to go to the node

Some of the line nodes are too many, often because the draw is in a place constantly hovering, without affecting the original data can be deleted in the case of accurate, this can also prevent the integration of the trajectory because of too many nodes and browsing editing slow.

(7). Keep a line as much as possible on one road (as per the circumstances )

Generally the way to keep a line, who draw to retain who, but some of the road is relatively broad (such as highway diameter), need to keep back and forth two paths, so more in line with the actual painting situation.

(8) To view the multiple lines before deleting them

Try not to delete the track line, you must back up before deleting, but also to control the trajectory points to determine whether it can be deleted, to ensure that there is no trace point where the track line can not be missing!

(9) Double-click the table header to sort by time

When you start editing a picture, double-click the header to sort by time, delete the time that is not the picture, and look for the start time.

(10) Set common shortcut keys

Because of the large amount of data, setting up shortcut keys will help improve efficiency, with common tools such as merging, editing tools, deleting vertices, interrupting, shaping features, and so on.

(11) Search for features greater than 2000

The display policy in the ArcGIS property sheet is similar to the pagination display in a Web page, because the amount of data is too large (greater than 2000 records), ArcMap can only display 2000 in the attribute table, and the scroll bar cannot be dragged down. However, it is now necessary to continue browsing downward by entering data values (such as 2001) in the text box in the lower left corner to see the new data.

(12) Setting optional layer

Because in the process of editing, only edit the track line this layer, often use the selection function, and often the other layer of data selection, this is very inconvenient, can be set in the table of contents-by selection, but the faster way is to right-select on the layer-the layer is set as the only optional layer.

(13) Timely preservation

No matter what software you use, as long as it is in the editing, you must remember to save, a lot of people have done for a good while the data results did not save, under normal circumstances is difficult to retrieve. So, keep it in time and develop a good habit. Now there are auto-saved software in ArcGIS, and you can set the save interval time.

(14) Turn on capture

The snapping feature in ArcGIS works just as well in CAD, enabling you to capture an edit that is useful for tracking.

A summary of the editing of Chinese and foreign industry locus in geographical conditions