TIGER fixup/250 cities/duplicate nodes

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New screenshot showing progress as of 2009-10-29 with 1256 marked nodes

Looking at duplicate nodes provides an alternative way of seeing which areas need most fixing. Remember fixing duplicate nodes is not the only problem to work on though. We'd like basic routability, but let's do a proper job of fixing up all the problems as we work our way along the interstates.

A lot of these problems are caused by the county borders in TIGER and there's a howto to help you get started fixing them. Other duplicate nodes may occur accidentally in the editing process, as it may be difficult to tell whether the cursor is in a position where it will join to existing ways or create a new node. Finally, users who are used to a non-topological model of data (e.g: as used in most conventional GIS products) may assume that the nodes join automatically - unfortunately they don't.

Maps

These old "250 cities" maps have been superseded by Duplicate nodes map

The duplicate motorway nodes map is all clear! It used to show duplicated nodes on any highway=motorway. Proceed to level 2...

The duplicate 'important' highways nodes map shows these errors on ways tagged as highway=primary, highway=trunk and highway=motorway. Be careful - this link needs a browser with a recent javascript engine to handle the number of markers. We suggest a recent version of Firefox, Safari or Google Chrome.

The duplicate highway nodes map shows these errors on ways tagged with road types as a tile layer. The road types used are: motorway, trunk, primary, secondary, tertiary, residential, unclassified, service and road, plus associated _link types.

Progress

Here's the history showing the number of dupe nodes decreasing as the data gets fixed.

Firstly dupe nodes on highway=motorways:

Date Duplicate motorway nodes
2009/08/18 979
2009/08/19 936
2009/08/20 924
2009/08/21 886
2009/08/24 767
2009/08/26 659
2009/08/27 626
2009/08/28 589
2009/09/02 522
2009/09/03 462
2009/09/07 455
2009/09/09 356
2009/09/10 302
2009/09/14 179
2009/09/15 148
2009/09/16 127
2009/09/17 122
N/S America Clear
2009/09/18 101
2009/09/21 96
2009/09/22 97
2009/09/23 84
2009/09/24 66
2009/09/25 64
2009/09/26 63
2009/09/27 64
2009/09/28 64
2009/09/29 59
2009/09/30 55
2009/10/01 55
2009/10/02 52
2009/10/03 44
2009/10/04 44
2009/10/05 42
2009/10/06 37
2009/10/07 31
2009/10/08 29
2009/10/09 29
2009/10/10 13
2009/10/11 14
2009/10/12 13
2009/10/13 -
All Clear!
2009/10/14 0
2009/10/15 1
2009/10/16 2
2009/10/17 1
2009/10/18 1
2009/10/19 1
2009/10/20 1
2009/10/21 1
2009/10/22 0
2009/10/23 1
2009/10/24 1
2009/10/25 1
2009/10/26 1
2009/10/27 1
2009/10/28 0
2009/10/29 0
2009/10/30 0
2009/10/31 0
2009/11/01 1
2009/11/02 1
2009/11/03 1
2009/11/04 1
2009/11/05 1
Stopped counting


...and for dupe nodes on other 'important' highways:

screenshot showing progress as of 2009-09-23 with 7414 nodes.
screenshot showing progress as of 2009-10-06 with 4500 nodes.
screenshot showing progress as of 2009-10-29 with 1256 nodes
Date Duplicate 'important' nodes
2009/09/17 7571
2009/09/18 7541
2009/09/19 7523
2009/09/20 7495
2009/09/21 7462
2009/09/22 7451
2009/09/23 7414 (image)
2009/09/24 7080
2009/09/25 6785
2009/09/26 6648
2009/09/27 6538
2009/09/28 6501
2009/09/29 6141
2009/09/30 6074
2009/10/01 5941
2009/10/02 5584
2009/10/03 5115
2009/10/04 4891
2009/10/05 4640
2009/10/06 4500 (image)
2009/10/07 4293
2009/10/08 4011
2009/10/09 3878
2009/10/10 3596
2009/10/11 3332
2009/10/12 3434
2009/10/13 3092
2009/10/14 2893
2009/10/15 2633
2009/10/16 2344
2009/10/17 2193
2009/10/18 1931
2009/10/19 1653
2009/10/20 1607
2009/10/21 1607
N America Clear
2009/10/22 1549
2009/10/23 1504
2009/10/24 1471
2009/10/25 1475
2009/10/26 1462
2009/10/27 1400
2009/10/28 1302
2009/10/29 1256 (image)
2009/10/30 1213
2009/10/31 1074
2009/11/01 658
2009/11/02 312
2009/11/03 178
2009/11/04 163
2009/11/05 165
2009/11/06 164
2009/11/07 162
2009/11/08 159