topic Re: Multiple hatches with the same value on a line in Data Management Questions

Multiple hatches with the same value on a line

ArnoldKuilman — Wed, 03 Sep 2014 09:10:14 GMT

After calibrating a route, I have some of the hatches showing multiple times. When zoomed in they show real close together as illustrated in the image below. Does anyone have seen this before, and know what the solution is to remove those multiple hatches, and make sure of a correct calibration?

Thanks in advance!

GIS for Hydrographic Surveying‌

Re: Multiple hatches with the same value on a line

RiyasDeen — Wed, 03 Sep 2014 10:49:28 GMT

Hi Arnold,

1) By any chance did you calibrate the route multiple times with extrapolate set to false? You may want to try calibrating the route again with extrapolate before and after set to true.

2) Double check to make sure that you don't have multiple calibration point in close proximity.

Re: Multiple hatches with the same value on a line

ArnoldKuilman — Wed, 03 Sep 2014 11:00:24 GMT

These are the settings I used, if you recommend other settings, then please let me know:

The files I use have a lot of calibration points close together, the lines are build up from the same points that I use for calibration. I will investigate if reducing the amount of calibration points will solve this problem.

Re: Multiple hatches with the same value on a line

RiyasDeen — Wed, 03 Sep 2014 11:07:25 GMT

Hi Arnold,

Setting looks good to me, probably its your calibration points. Most likely you are having a cluster of points with same measure.

Re: Multiple hatches with the same value on a line

GeorgeNewbury — Wed, 03 Sep 2014 11:26:30 GMT

Start an edit session and look at the M values for the vertices along that line in that area.

Re: Multiple hatches with the same value on a line

ArnoldKuilman — Wed, 03 Sep 2014 12:08:46 GMT

There are no points with the same measure on individual lines. But the amount of duplicate hatches varies if I reduce the amount of points for calibrating the line. Sometimes the number of duplicate hatches increase, other times they decrease. Really looks like a bug in ArcMap to me. Some trial and error might give a temporary solution.

Maybe some people at Esri Technical Support can have a look at this?‌

Re: Multiple hatches with the same value on a line

GeorgeNewbury — Wed, 03 Sep 2014 12:22:45 GMT

Could it be a rounding issue? i.e. the point hatches that are showing are a result of being rounded to 1.250.

Re: Multiple hatches with the same value on a line

ArnoldKuilman — Wed, 03 Sep 2014 12:34:07 GMT

I don't think so.. I set the hatches to show every 250 meters. The M-values are KP's (Kilometre Points), and nearly none of them are a multiple of .250 km.

Some of the multiple hatches show at a line where I only have one calibration point in their direct proximity. See screenshot below. The red dots presents the values for calibration.

Re: Multiple hatches with the same value on a line

RiyasDeen — Wed, 03 Sep 2014 12:35:29 GMT

Hi Arnold,

Is this multiple patch thing happening at random location? If this is happening at same location for same measure. Consider below image, the black dots are calibration points, and the red ones are measure location 1.250, even though the calibration points don't have same measures, you can end up getting multiple location with same measure.

Can you check if you can see this pattern in your calibration point measure.

Re: Multiple hatches with the same value on a line

ArnoldKuilman — Wed, 03 Sep 2014 12:41:19 GMT

Sorry, that's not it. All points are ascending along the line.

If you look at the image in my previous reply you will see the calibration points increase, while the hatches around them all show KP 0.000.

Re: Multiple hatches with the same value on a line

RiyasDeen — Wed, 03 Sep 2014 13:00:24 GMT

Saw your image just now, what is your route feature class M Tolerance and M Resolution? Is it 0,001 and 0.0001?

Re: Multiple hatches with the same value on a line

ArnoldKuilman — Wed, 03 Sep 2014 13:05:58 GMT

Yes M resolution is 0.0001, tolerance is 0.001

If I increase tolerance/resolution, the problem stays.

Re: Multiple hatches with the same value on a line

RiyasDeen — Wed, 03 Sep 2014 13:20:24 GMT

That explains your second image, Difference in measure between your calibration points is 0.00102 because of your tolerance (0.001) value there is no change in measure between these two calibration point. That's why you are getting measure between these points as 0.000

Try creating a new feature class with tolerance 0.00001 and resolution 0.000001. You should get different measure at your hatches.

Re: Multiple hatches with the same value on a line

RiyasDeen — Wed, 03 Sep 2014 13:23:22 GMT

Interesting!!! Now i'm out of reasons . Can you post a subset of your route feature and calibration points where you have issues. I'll have a closer look.

Re: Multiple hatches with the same value on a line

ArnoldKuilman — Wed, 03 Sep 2014 13:33:18 GMT

Problem solved, I forgot to increase the M-resolution for the line feature itself. I only increased the resolution for the calibration points!!

Thanks for the help!!

Re: Multiple hatches with the same value on a line

RiyasDeen — Wed, 03 Sep 2014 13:36:03 GMT

Hi Arnold,

How about the hatches in your first image, has it gone as well?

Re: Multiple hatches with the same value on a line

ArnoldKuilman — Wed, 03 Sep 2014 13:50:59 GMT

Here is the answer: Thanks again for all the help!!