Web map zoom levels updated

By Aileen Buckley, Research Cartographer

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Quite some time ago, I wrote a blog post about the zoom levels used for web maps. Since these have been expanded to include even larger scales, I am updating them here. There are now 23 levels that range from a global scale (zoom level 0 at about 1:591,000,000) to a local scale (zoom level 23 at about 1:70).

I don’t have time right now to update all of the info in the original post, but you should be aware that a lot of it needs to be updated! In the meantime, at least this info is now up to date! Hope this helps those of you who need this!

Scale is the RF 1:XX 

Levels of Detail: 24

  • Level ID: 0
    • Resolution: 156543.03392800014
    • Scale: 5.91657527591555E8
  • Level ID: 1
    • Resolution: 78271.51696399994
    • Scale: 2.95828763795777E8
  • Level ID: 2
    • Resolution: 39135.75848200009
    • Scale: 1.47914381897889E8
  • Level ID: 3
    • Resolution: 19567.87924099992
    • Scale: 7.3957190948944E7
  • Level ID: 4
    • Resolution: 9783.93962049996
    • Scale: 3.6978595474472E7
  • Level ID: 5
    • Resolution: 4891.96981024998
    • Scale: 1.8489297737236E7
  • Level ID: 6
    • Resolution: 2445.98490512499
    • Scale: 9244648.868618
  • Level ID: 7
    • Resolution: 1222.992452562495
    • Scale: 4622324.434309
  • Level ID: 8
    • Resolution: 611.4962262813797
    • Scale: 2311162.217155
  • Level ID: 9
    • Resolution: 305.74811314055756
    • Scale: 1155581.108577
  • Level ID: 10
    • Resolution: 152.87405657041106
    • Scale: 577790.554289
  • Level ID: 11
    • Resolution: 76.43702828507324
    • Scale: 288895.277144
  • Level ID: 12
    • Resolution: 38.21851414253662
    • Scale: 144447.638572
  • Level ID: 13
    • Resolution: 19.10925707126831
    • Scale: 72223.819286
  • Level ID: 14
    • Resolution: 9.554628535634155
    • Scale: 36111.909643
  • Level ID: 15
    • Resolution: 4.77731426794937
    • Scale: 18055.954822
  • Level ID: 16
    • Resolution: 2.388657133974685
    • Scale: 9027.977411
  • Level ID: 17
    • Resolution: 1.1943285668550503
    • Scale: 4513.988705
  • Level ID: 18
    • Resolution: 0.5971642835598172
    • Scale: 2256.994353
  • Level ID: 19
    • Resolution: 0.29858214164761665
    • Scale: 1128.497176
  • Level ID: 20
    • Resolution: 0.14929107082380833
    • Scale: 564.248588
  • Level ID: 21
    • Resolution: 0.07464553541190416
    • Scale: 282.124294
  • Level ID: 22
    • Resolution: 0.03732276770595208
    • Scale: 141.062147
  • Level ID: 23
    • Resolution: 0.01866138385297604
    • Scale: 70.5310735
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4 Comments

  1. douglas.schenk says:

    Are cached basemaps going to be created down to these new map scales? Seems like this would be impractical (size wise) for raster tiles.

    • abuckley says:

      For most of our basemaps (Topo, Street, etc.), we have cache down to level 19 across many areas of the map. For Canvases, we only cache down to level 16. There are some other basemaps with smaller maximum scale levels (Terrain w/ Labels, Nat Geo).
      We do resample basemaps down to level 23 in the map viewer so we don’t display “No Data Available” tiles.

      For imagery, we provide cache down to level 22 in very limited areas. The first contribution actually cached at level 22 was from New Zealand and information about this (with images) is included near the end of this blog from April: https://blogs.esri.com/esri/arcgis/2017/04/25/world-imagery-updates-april-2017/. We resample imagery to level 23.

  2. TomPF says:

    I am confused about which Level of Detail would display when you are in between the scales listed above. So, for example, if you have a map that is set to a scale of 2,000, which is between Level 18 and Level 19, would the tiles from Level 18 be showing, or the tiles from Level 19? The reason I ask is because I am writing some code to return the Level of Detail given a particular scale.