Issue 807 - gmaps-api-issues - Some Polylines not visible as higher zoom levels

Issue 807:	Some Polylines not visible as higher zoom levels
	18 people starred this issue and may be notified of changes.	Back to list

Status:	Fixed
Owner:	----
Closed:	Mar 2009
Type-Defect
ApiType-Javascript
Introduced-2.92
Class-GPolyline
Internal-1448933
Regression-Yes
Fixed-2.150

Reported by geocodezip, Oct 25, 2008

Link:
http://www.geocodezip.com/TestPolyline.asp

1. Zoom out once - the red non-encoded polyline appears (over the blue 
encoded version)
2. Zoom back in - it disappears

What version of the API are you using?
This occurs in API versions from v=2.92 and after, up to and including 
v=2.x which is currently 2.133d:
http://www.geocodezip.com/TestPolyline.asp?APIV=2.92
http://www.geocodezip.com/TestPolyline.asp?APIV=x

This does not occur in API versions prior to v=2.91
http://www.geocodezip.com/TestPolyline.asp?APIV=2.91

What operating system and browser are you using?
Occurs in 
IE 6.0
FF 3.0.3
Chrome 0.2.149.27
Opera 9.01
all running on Windows XP



*********************************************************
For developers viewing this issue: please click the 'star' icon to be 
notified of future changes, and to let us know how many of you are 
interested in seeing it resolved.
*********************************************************

Comment 1 by geocodezip, Oct 25, 2008

The thread in the Google Maps API group that brought this up is:
http://groups.google.com/group/Google-Maps-
API/browse_frm/thread/9e925fcfddfa02cf/69096f721188e40e?
lnk=gst&q=TestPolyline.asp#69096f721188e40e

Comment 2 by pamela.fox, Oct 27, 2008

Thanks, shared with team.

Status: Accepted
Labels: Introduced-2.92 Class-GPolyline Internal-1448933

Comment 3 by mr...@hotmail.com, Oct 31, 2008

I have the same problem, hopefully it gets resolved soon.

I also noticed that the threshold zoom level after which the polyline disappears is
dependent on the map location's maximum zoom level. For example, if the maximum zoom
level in a location (say Belfast in Norther Ireland) is 21, the polyline disappear
after zoom level 13. If the maximum zoom level of the map is 20 (say New York), the
polyline disappears at zoom level 12.

Comment 4 by geocodezip, Dec 02, 2008

Another example: 
Green non-encoded polyline visible:
http://www.geocodezip.com/GenericMapBrowser.asp?
filename=JetBlue081130c_issue.xml&zoom=13&debug=yes&lat=32.610333&lon=-116.979083

Green non-encoded polyline not visible:
http://www.geocodezip.com/GenericMapBrowser.asp?
filename=JetBlue081130c_issue.xml&zoom=14&debug=yes&lat=32.610333&lon=-116.979083

Comment 5 by cleclef, Dec 15, 2008

I get the same problem. Do you know when the fix will be released?

Comment 6 by andrew.aoh, Jan 26, 2009

I have the same issue as well in Kaohsiung port.  Polyline disappears when I zoom in
at higher levels.  Is this a known bug and will it be fixed in the future?

Comment 7 by pamela.fox, Feb 27, 2009

(No comment was entered for this change.)

Labels: Blocking-2s

Comment 8 by pamela.fox, Feb 27, 2009

(No comment was entered for this change.)

Labels: -Blocking-2s Regression-Yes

Comment 9 by pamela.fox, Mar 17, 2009

(No comment was entered for this change.)

Status: Fixed
Labels: Fixed-2.150

Comment 10 by guillaum...@alpstein.de, Mar 23, 2009

By any chance, would this fix issues 15 and/or 19 ?

Comment 11 by duni...@cs.utk.edu, Apr 03, 2009

I have a similar problem, and I tried v=2.150 (I think), and it still failed.
See the following
  http://www.cs.utk.edu/~dunigan/google.php?lat=35.958&lon=-84.378&scale=12&trk=tmp

as you zoom in, the polyline eventually disappears.  If you go to the east end
of the polyline, near origin/end, and zoom in, it does not disappear.

please advise

Comment 12 by duni...@cs.utk.edu, Apr 03, 2009

I just tried with v=2.x and it seems to work.  I was using just v=2, what is the
policy in selecting version ??

thanks

Comment 13 by pamela.fox, Apr 04, 2009

See the docs on API updates:
http://code.google.com/apis/maps/documentation/#API_Updates

If v2.x works better for you now, find out what version that is (check the changelog) 
and hardcode to that version #. It's not advised to use the v2.x alias in production.

Comment 14 by sanderbonus, Sep 10, 2009

In my experience, an encoded polyline hides at the zoomlevel at which no new points
are added to the line. So to be sure to keep the line visible up to the highest zoom
level, make sure that all possible levels ("?@ABCD....[numLevel]") are represented
within each line.
This has been tested at the latest running version (just v=2)