2019_0802 USGS topo maps change from “USGS 7.5' “ to “Scanned Topos”

Thomas Mathey's Avatar

Thomas Mathey

02 Aug, 2019 07:34 PM

Somewhat recently, the USGS topo maps were changed from “USGS 7.5' “ to “Scanned Topos”.
The details provided in the previous “USGS 7.5' “ were better than in the present “Scanned Topos”.
Starting at
  https://ngmdb.usgs.gov/topoview/viewer/#4/40.01/-99.93
and getting to
    1984 (HTMC, 1984 ed.) scale 1:24,000; darker color green for forest
    1984 (HTMC, 1994 ed.) scale 1:24,000; lighter color green for forest
shows needed details

But getting to any newer version
1994, 2013, 2015, 2018
has details removed.

Question: how to use caltopo to get to 1984 version ??

Thanks

  1. Support Staff 1 Posted by rmarcucci on 02 Aug, 2019 08:08 PM

    rmarcucci's Avatar

    Thomas,

    If you're talking about use within the United States, there has been no change to the layer beyond the naming convention. We changed the name because we added Canadian and Mexican topos to the layer, thereby making the old name inaccurate.

    Regarding how to use a different version of USGS maps, the process is a bit wonky but here we go:

    1) Head to https://ngmdb.usgs.gov/topoview/viewer/#4/40.01/-99.93
    2) Download the maps, ideally in JPEG when available
    3) Convert it into a JPEG, if it's a TIFF or PDF
    3) Host that JPEG somewhere
    4) Add it as a geospatial image, including hand-aligning points

    Please let me know if you need any further assistance. We hope to add support for GeoPDFs within the next year, but that's the process for now.

    Thank you for using CalTopo,
    Rom

  2. rmarcucci closed this discussion on 02 Aug, 2019 08:08 PM.

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