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Update MSHR Creation Requirements

By NGP Standards and Specifications

Maximum Surface Height Rasters (MSHR) are used to provide withheld flag Proof of Performance. This revision modifies the MSHR creation method to better visualize point misclassification and inappropriate application of the withheld flag. 

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This revision has been modified to remove references to binning for clarity.  

Current requirement: 

in LBS 2022 Rev A: Appendix 1: Maximum Surface Height Rasters:

Maximum Surface Height Raster

  • Raster Creation:

    • Spatial resolution (pixel dimension) of the images shall be identical to the ground sample distance of the DEM deliverable in the project’s linear unit (meters or feet). 

    • The MSHR shall be representative of the associated data delivery.

    • The raster shall be in the same coordinate reference system (CRS) as the point cloud data to ensure alignment with the point cloud.

    • All returns shall be used to create the raster.

    • Points flagged as withheld shall be excluded.

    • The raster shall be built with the highest elevation point value from each pixel.

    • The raster shall be 32-bit, floating point.

Change to: 

(Modifications are in bold text.)

Maximum Surface Height Raster

  • Raster Creation:

    • Spatial resolution (pixel dimension) of the images shall be twice (2x) the bare-earth DEM deliverable cell size in the project’s linear unit (meters or feet). 

    • The grid cell size shall be specified and described in the associated mapping report (see Deliverables for the Lidar Mapping Report requirements). 

    • TIN methods shall not be used to create the rasters. 

    • The MSHR shall be representative of the associated data delivery.

    • The raster shall be in the same coordinate reference system (CRS) as the point cloud data to ensure alignment with the point cloud.

    • All returns shall be used to create the raster.

    • Voids shall not be filled.

    • Points flagged as withheld shall be excluded.

    • The raster shall be built with the highest elevation point value from each pixel.

    • The raster shall be 32-bit, floating point.

    • Delivery shall be tiles in the same tiling scheme as the bare-earth deliverable.