Jump to content

 
Photo

Need DLG Hypsography for 1:100,000 Bogalusa, Louisiana Map

- - - - -

  • Please log in to reply
4 replies to this topic

#1
Textularia

Textularia

    Contributor

  • Validated Member
  • PipPip
  • 17 posts
  • Gender:Male
  • Location:Baton Rouge, Louisiana
  • Interests:Quaternary geology, archaeological geology, geologic mapping, archaeology.
  • United States

Dear Friends,

I am participating in the preparations of a geologic map for
the Bogalusa 30 by 60 degree quadrangle.

However, we have one problem, for which we desperately
need a solution. The USGS DLGs for the Bogalusa, Louisiana,
1:100,000 scale map, which we can find, lacks the hypsography.
I suspect that the hypsography file was removed because it
was corrupted and never replaced. As a result, the base,
which we have for the geologic map, lacks any contour lines.

Does anyone know where I can find the DLG for the Bogalusa,
Louisiana, 30 by 60 quadrangle, for the hypsography?

Any help, which anyone can give me finding hypsography,
which we can use, for the Bogalusa 1:100,000 scale
map will be greatly appreciated.

Best Regards,

Paul
Baton Rouge, LA

#2
Sky Schemer

Sky Schemer

    Master Contributor

  • Validated Member
  • PipPipPipPip
  • 119 posts
  • Location:Hillsboro, OR
  • United States

You want the National Hydrography Dataset. Note that the interface is more complicated than what you are used to with DLG downloads, but at least it's slower and more tempremental. :huh:

#3
Textularia

Textularia

    Contributor

  • Validated Member
  • PipPip
  • 17 posts
  • Gender:Male
  • Location:Baton Rouge, Louisiana
  • Interests:Quaternary geology, archaeological geology, geologic mapping, archaeology.
  • United States

You want the National Hydrography Dataset. Note that the interface is more complicated than what you are used to with DLG downloads, but at least it's slower and more tempremental. :huh:


Looking at it, all I can find is the hydrography data. How can I access the USGS Hypsography data using this web page?

The USGS hydrography data was readily found. It is the USGS hypsography, which we need for the Bogalusa, Louisiana, 30 by 60 degree quadrangle.

Best Regards,

Paul

#4
graveldraw

graveldraw

    Contributor

  • Validated Member
  • PipPip
  • 23 posts
  • Gender:Male
  • United States

You might be able to find the hypsography layer on another site, like GeoCommunity.

If not, you can recreate the contours from the digital elevation data. See National Elevation Data at ned.usgs.gov.

The data you want for the 1:100,000 is 2-arc-second. I think the contour interval is 20 meters on the published maps, but I like using 50 feet contours in areas of lower relief with this map scale. If you don't already have it, you can find the DRG (scanned) map to overlay your generated contours as a check.

Best,
Dan

#5
Sky Schemer

Sky Schemer

    Master Contributor

  • Validated Member
  • PipPipPipPip
  • 119 posts
  • Location:Hillsboro, OR
  • United States

Looking at it, all I can find is the hydrography data. How can I access the USGS Hypsography data using this web page?


Whoops. I mis-read your post.

You want the National Elevation Dataset from the Seamless Data Distribution System, which has an equally (if not exceedingly) crappy web interface. For 1:100k scale, you'll likely want the 1 arc second layer, either from NED or SRTM depending on which is avialable.

Note that you can only download the rasters. You'll have to build the contours yourself.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

-->