{ "currentVersion": 10.81, "serviceDescription": "

Methods:<\/SPAN> <\/SPAN><\/SPAN><\/P>

This LiDAR derivative provides information about vegetation height. The 3-foot resolution raster was produced from the winter, 2019 Quality Level 1 LiDAR point cloud (already ground classified) using Lastools in a multistep process. The processing steps were as follows:<\/SPAN><\/SPAN><\/P>

  • Create Tiles (lastile)<\/SPAN><\/P><\/LI>

  • Height Normalize the Point Cloud (lasheight)<\/SPAN><\/P><\/LI>

  • Classify Buildings (lasclassify)<\/SPAN><\/P><\/LI>

  • Clamp Building to 0 Ft. Normalized Height (las2las)<\/SPAN><\/P><\/LI>

  • Thin the Point Cloud (lasthin)<\/SPAN><\/P><\/LI>

  • Convert the Point Cloud to a DEM (las2dem) <\/SPAN><\/P><\/LI><\/UL>

    Uses and Limitations:<\/SPAN><\/P>

    The canopy height model provides a raster depiction of the highest vegetation returns for each 3x3 foot raster cell across Marin County. The layer is useful for myriad vegetation and forest-related analysis and is an important input to the automated processes used to develop the Marin County fine scale vegetation map. However, this data product was produced based on a rapid, fully automated point cloud classification and was not manually edited. As such, it includes some \u2018false positives\u2019 \u2013 pixels with a canopy height in the raster that aren\u2019t vegetation. These false positives include noise from water aboveground non-vegetation returns from bridge decks, powerlines, and edges of buildings.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>", "name": "LIDAR/MARIN_2019_CHM_3FT", "description": "

    Methods:<\/SPAN> <\/SPAN><\/SPAN><\/P>

    This LiDAR derivative provides information about vegetation height. The 3-foot resolution raster was produced from the winter, 2019 Quality Level 1 LiDAR point cloud (already ground classified) using Lastools in a multistep process. The processing steps were as follows:<\/SPAN><\/SPAN><\/P>

    • Create Tiles (lastile)<\/SPAN><\/P><\/LI>

    • Height Normalize the Point Cloud (lasheight)<\/SPAN><\/P><\/LI>

    • Classify Buildings (lasclassify)<\/SPAN><\/P><\/LI>

    • Clamp Building to 0 Ft. Normalized Height (las2las)<\/SPAN><\/P><\/LI>

    • Thin the Point Cloud (lasthin)<\/SPAN><\/P><\/LI>

    • Convert the Point Cloud to a DEM (las2dem) <\/SPAN><\/P><\/LI><\/UL>

      Uses and Limitations:<\/SPAN><\/P>

      The canopy height model provides a raster depiction of the highest vegetation returns for each 3x3 foot raster cell across Marin County. The layer is useful for myriad vegetation and forest-related analysis and is an important input to the automated processes used to develop the Marin County fine scale vegetation map. However, this data product was produced based on a rapid, fully automated point cloud classification and was not manually edited. As such, it includes some \u2018false positives\u2019 \u2013 pixels with a canopy height in the raster that aren\u2019t vegetation. 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