# Source: USGS 3DEP Lidar Height above Ground
# Type: cog
# Catalog: STACConnector
# Generated by: folia catalog import
# Generated at: 2026-02-08T00:48:49.718395+00:00
#
# Do not edit manually - will be overwritten on next import.

source:
  id: planetary-computer-3dep-lidar-hag
  name: USGS 3DEP Lidar Height above Ground
  type: cog
  url: https://planetarycomputer.microsoft.com/api/stac/v1/collections/3dep-lidar-hag
  description: 'This COG type is generated using the Z dimension of the [COPC data](https://planetarycomputer.microsoft.com/dataset/3dep-lidar-copc)
    data and removes noise, water, and using [`pdal.filters.smrf`](https://pdal.io/stages/filters.smrf.html#filters-smrf)
    followed by [pdal.filters.hag_nn](https://pdal.io/stages/filters.hag_nn.html#filters-hag-nn).


    The Height Above Ground Nearest Neighbor filter takes as input a point cloud with
    Classification set to 2 for ground points. It creates a new dimension, HeightAboveGround,
    that contains the normalized height values.


    Ground points may be generated with [`pdal.filters.pmf`](https://pdal.io/stages/filters.pmf.html#filters-pmf)
    or [`pdal.filters.smrf`](https://pdal.io/stages/filters.smrf.html#filters-smrf),
    but you can use any method you choose, as long as the ground returns are marked.


    Normalized heights are a commonly used attribute of point cloud data. This can
    also be referred to as height above ground (HAG) or above ground level (AGL) heights.
    In the end, it is simply a measure of a point''s relative height as opposed to
    its raw elevation value.


    The filter finds the number of ground points nearest to the non-ground point under
    consideration. It calculates an average ground height weighted by the distance
    of each ground point from the non-ground point. The HeightAboveGround is the difference
    between the Z value of the non-ground point and the interpolated ground height.

    '
  provider: Landrush
  license: proprietary
  metadata:
    stac: true
    stac_api: true
    connector_id: planetary-computer
    tags:
    - USGS
    - 3DEP
    - COG
    - Elevation
    dataset:
      tier: 1
      thematic_group: Soil & Terrain
      format: cog
      crs: EPSG:4326
      temporal:
        range: 2012-01-01/2022-01-01
        type: snapshot
        default_range: latest
      quality:
        coverage: global
      layout:
        type: tiled
      stac_collection_id: 3dep-lidar-hag
      homepage: https://planetarycomputer.microsoft.com/api/stac/v1/collections/3dep-lidar-hag