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USGS NED 10-Meter Contours

Layer Thumbnail Map

This metadata information is subject to our disclaimer. Metadata information presented here is maintained manually. Therefore, date-sensitive fields such as feature count and date of last update may not be up-to-date. All metadata is subject to errors inherent in a manual process.


Descriptive nameUSGS NED 10-Meter Contours
File namecn10mned
Spatial domainPima County
AbstractCN10MNED is a 10-meter contour layer covering the full extent of Pima County. It was created from the most-recent 1/3-arc-second U.S. Geological Survey National Elevation Dataset (NED) DEMs, some of them part of the 3DEP program.

This layer is so large that the decision was made to only store it in the enterprise geodatabase, rather than convert it to shapefile format.

Although it has a coarser vertical resolution than some of the other contour layers in the Library, it has the advantage of full, seamless coverage for the entire county.
Known errors/qualificationsIt may be difficult to export this layer due to its size. The feature class is 671 MB and a shapefile created from the feature class would be 1.08 GB.

The "Published Enterprise GDB" date is a fictitious value in the metadata so that the metadata has a date that's guaranteed to be older than any generated metadata thumbnail PDF. Since the Library Manager doesn't set this date for "GDB No Export" maintenance format (as it should), the fictitious date was entered so the GIS Library Thumbnails job would run.
Feature typeline
Feature count 58,652
Thumbnail Map cn10mned.pdf PDF file format   (67,047,459 bytes, PDF created 07/19/2022 )
ProjectionNAD83 HPGN (Parameters)
Rectificationunknown
Field/value metadata Field metadata
Source organizationU.S. Geological Survey
Source contact
Source document or file namemultiple files
Source date20170718
Source scale
Source formatGrid
Date of last data update
(This date may not be current.)
20170725
Last data update byErik Glenn
Date/time last touched - Meaning? 2021-01-14  10:38 PM - Enterprise GDB - Library input format
    - The Shapefile date was not found.
  See coverage files, if any, for date.
Lineage20170725 -- After downloading eight different 1/3-arc-second grids, covering the entirety of Pima County, all files were converted to 32-bit floating-point tiled TIFFs with LZW compression. The eight TIFFs were reprojected and mosaicked into one TIFF, and then that raster dataset was smoothed using a low-pass 3-by-3 mean value filter. Ten-meter contours were generated from the smoothed TIFF and then clipped to Pima County. Extremely short contours (<30 feet) were removed. (EG)
On maintenance?Not required
Maintenance organization
Maintenance description
Original conversion byErik Glenn
Pima County ITD GIS contactErik Glenn
Alternate Pima County ITD GIS contacte-mail address
On  Pima County Geospatial Data Portal? No

See Metadata Field Descriptions.
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