1 foot Digital Elevation Model (DEM) Integer Raster
A bare-earth, hydro-flattened, digital-elevation surface model derived from 2010 Light Detection and Ranging (LiDAR) data. Surface models are raster representations derived by interpolating the LiDAR point data to produce a seamless gridded elevation data set. A Digital Elevation Model (DEM) is a surface model generated from the LiDAR returns that correspond to the ground with all buildings, trees and other above ground features removed. The cell values represent the elevation of the ground relative to sea level. The DEM was generated by interpolating the LiDAR ground points to create a 1 foot resolution seamless surface. Cell values correspond to the ground elevation value (feet) above sea level. A proprietary approach to surface model generation was developed that reduced spurious elevation values in areas where there were no LiDAR returns, primarily beneath buildings and over water. This was combined with a detailed manual QA/QC process, with emphasis on accurate representation of docks and bare-earth within 2000ft of the water bodies surrounding each of the five boroughs.
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Freshness
The publisher's promise
How the agency that publishes this data says it keeps the data current.
DormantNo automatic refresh
- Automatic refresh
No scheduled refresh runs for this dataset, and a refresh you ask for on this page is refused.
- The publisher set a regular schedule for this dataset but has not updated it for far longer than that schedule, so the automatic queue skips it. An hourly triage lifts this fence once the publisher updates it again, which takes up to about 7 hours 15 minutes. This fence does not stop a refresh you ask for on this page.
- Our catalog lists this dataset without keeping a copy of its rows, so the automatic queue has no copy to refresh. This fence refuses a refresh you ask for on this page.
- This dataset needs a copy method that the automatic queue does not run, such as a bulk export of a very large table. This fence refuses a refresh you ask for on this page.
- Says it updates
- Annually
- Actually updates about every
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- Publisher last updated the data
- Nov 13, 2017
Our mirror
Whether our copy of this data is current with the source.
Not mirrored
- We last synced
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- Rows in our copy
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- Rows at the source
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- Our copy trails the source by
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Columns
Each source column, with the name and type we use to store it.
The publisher has not provided a data dictionary.
No column manifest is on record for this dataset yet.
Download
This dataset is catalogued but not mirrored, so there is no downloadable copy yet.
Refresh on request
No scheduled refresh runs for this dataset, and a refresh you ask for on this page is refused. See why under Freshness
Source and attribution
Where this data comes from, which version we hold, and what we changed.
- Source
- https://data.cityofnewyork.us/d/7kuu-zah7
- Version
- Snapshot taken:
Nov 13, 2017, 1:44 PM - What we changed
- We did not change the data. We stored it as published.
- Publisher
- codenownyc
- We retrieved it
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Update history
We have not recorded an update run for this dataset yet.