GLMETRICS v001

G-LiHT Metrics


PI: Bruce Cook

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Description

Goddard’s LiDAR, Hyperspectral, and Thermal Imager (G-LiHT) mission is a portable, airborne imaging system that aims to simultaneously map the composition, structure, and function of terrestrial ecosystems. G-LiHT primarily focuses on a broad diversity of forest communities and ecoregions in North America, mapping aerial swaths over the conterminous United States (CONUS), Alaska, Puerto Rico, and Mexico.

The purpose of G-LiHT’s Metrics data product (GLMETRICS) is to provide extensive lidar height and density metrics and return statistics in more than 80 science dataset layers. Included in the product are mean, standard deviation, and percentile information for ground, tree, and shrub data. Some flights also contain Canopy Height Model (CHM) and Digital Terrain Model (DTM) returns. The total number of metrics layers varies by flight or campaign.

GLMETRICS data are processed as a raster data product (GeoTIFF) at a 13 meter spatial resolution over locally defined areas.

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Characteristics

Collection and Granule

Collection

Characteristic Description
CollectionG-LiHT
DOI10.5067/Community/GLIHT/GLMETRICS.001
File Size~1 MB
Temporal ResolutionVaries
Temporal Extent2011-06-30 to Present
Spatial ExtentNorth America
Coordinate SystemUniversal Transverse Mercator (UTM)
DatumWorld Geodetic System (WGS84)
File FormatGeoTIFF
Geographic DimensionsVaries

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers88
Columns/RowsVaries x Varies
Pixel Size13 m

Layers / Variables

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
pulse_density Laser pulse density Number 32-bit floating point N/A N/A N/A N/A
pulse_scan_angle Mean laser pulse scan angle (from nadir) Degree 32-bit floating point N/A N/A N/A N/A
returns_per_pulse Mean number of returns per laser pulse Number 32-bit floating point N/A N/A N/A N/A
all_mean Mean of all return heights Meters 32-bit floating point N/A N/A N/A N/A
all_qmean Quadratic mean of all return heights Meters 32-bit floating point N/A N/A N/A N/A
all_stdev Standard deviation of all return heights Meters 32-bit floating point N/A N/A N/A N/A
all_skew Skewness of all return heights Meters 32-bit floating point N/A N/A N/A N/A
all_kurt Kurtosis of all return height Meters 32-bit floating point N/A N/A N/A N/A
all_p10 Height percentiles (10% increment) of all returns Meters 32-bit floating point N/A N/A N/A N/A
all_p20 Height percentiles (20% increment) of all returns Meters 32-bit floating point N/A N/A N/A N/A
all_p30 Height percentiles (30% increment) of all returns Meters 32-bit floating point N/A N/A N/A N/A
all_p40 Height percentiles (40% increment) of all returns Meters 32-bit floating point N/A N/A N/A N/A
all_p50 Height percentiles (50% increment) of all returns Meters 32-bit floating point N/A N/A N/A N/A
all_p60 Height percentiles (60% increment) of all returns Meters 32-bit floating point N/A N/A N/A N/A
all_p70 Height percentiles (70% increment) of all returns Meters 32-bit floating point N/A N/A N/A N/A
all_p80 Height percentiles (80% increment) of all returns Meters 32-bit floating point N/A N/A N/A N/A
all_p90 Height percentiles (90% increment) of all returns Meters 32-bit floating point N/A N/A N/A N/A
all_p100 Height percentiles (100% increment) of all returns Meters 32-bit floating point N/A N/A N/A N/A
all_d0 Density deciles (0% increment) of all returns Fraction 32-bit floating point N/A N/A N/A N/A
all_d1 Density deciles (10% increment) of all returns Fraction 32-bit floating point N/A N/A N/A N/A
all_d2 Density deciles (20% increment) of all returns Fraction 32-bit floating point N/A N/A N/A N/A
all_d3 Density deciles (30% increment) of all returns Fraction 32-bit floating point N/A N/A N/A N/A
all_d4 Density deciles (40% increment) of all returns Fraction 32-bit floating point N/A N/A N/A N/A
all_d5 Density deciles (50% increment) of all returns Fraction 32-bit floating point N/A N/A N/A N/A
all_d6 Density deciles (60% increment) of all returns Fraction 32-bit floating point N/A N/A N/A N/A
all_d7 Density deciles (70% increment) of all returns Fraction 32-bit floating point N/A N/A N/A N/A
all_d8 Density deciles (80% increment) of all returns Fraction 32-bit floating point N/A N/A N/A N/A
all_d9 Density deciles (90% increment) of all returns Fraction 32-bit floating point N/A N/A N/A N/A
all_refl_max Maximum relative reflectance of all single returns Fraction 32-bit floating point N/A N/A N/A N/A
all_refl_mean Mean relative reflectance of all single returns Fraction 32-bit floating point N/A N/A N/A N/A
shrub_mean Mean of shrub return heights Meters 32-bit floating point N/A N/A N/A N/A
shrub_stdev Standard deviation of shrub return heights Meters 32-bit floating point N/A N/A N/A N/A
shrub_refl_max Maximum relative reflectance of shrub single returns Fraction 32-bit floating point N/A N/A N/A N/A
shrub_refl_mean Mean relative reflectance of shrub single returns Fraction 32-bit floating point N/A N/A N/A N/A
tree_mean Mean of tree return heights Meters 32-bit floating point N/A N/A N/A N/A
tree_qmean Quadratic mean of tree return heights Meters 32-bit floating point N/A N/A N/A N/A
tree_stdev Standard deviation of tree return height Meters 32-bit floating point N/A N/A N/A N/A
tree_rugosity Standard deviation of gridded CHM values Meters 32-bit floating point N/A N/A N/A N/A
tree_skew Skewness of tree return heights Meters 32-bit floating point N/A N/A N/A N/A
tree_kurt Kurtosis of tree return height Meters 32-bit floating point N/A N/A N/A N/A
tree_fcover Fraction of first returns intercepted by tree Fraction 32-bit floating point N/A N/A N/A N/A
tree_fract_all Fraction of all returns classified as tree Fraction 32-bit floating point N/A N/A N/A N/A
tree_p10 Height percentiles (10% increment) of tree return Meters 32-bit floating point N/A N/A N/A N/A
tree_p20 Height percentiles (20% increment) of tree return Meters 32-bit floating point N/A N/A N/A N/A
tree_p30 Height percentiles (30% increment) of tree return Meters 32-bit floating point N/A N/A N/A N/A
tree_p40 Height percentiles (40% increment) of tree return Meters 32-bit floating point N/A N/A N/A N/A
tree_p50 Height percentiles (50% increment) of tree return Meters 32-bit floating point N/A N/A N/A N/A
tree_p60 Height percentiles (60% increment) of tree return Meters 32-bit floating point N/A N/A N/A N/A
tree_p70 Height percentiles (70% increment) of tree return Meters 32-bit floating point N/A N/A N/A N/A
tree_p80 Height percentiles (80% increment) of tree return Meters 32-bit floating point N/A N/A N/A N/A
tree_p90 Height percentiles (90% increment) of tree return Meters 32-bit floating point N/A N/A N/A N/A
tree_p100 Height percentiles (100% increment) of tree return Meters 32-bit floating point N/A N/A N/A N/A
tree_d0 Density deciles (0% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
tree_d1 Density deciles (10% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
tree_d2 Density deciles (20% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
tree_d3 Density deciles (30% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
tree_d4 Density deciles (40% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
tree_d5 Density deciles (50% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
tree_d6 Density deciles (60% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
tree_d7 Density deciles (70% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
tree_d8 Density deciles (80% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
tree_d9 Density deciles (90% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
tree_iqr Interquartile range (tree_p75‐tree_p25) of tree returns Meters 32-bit floating point N/A N/A N/A N/A
tree_vdr Vertical Distribution Ratio (normalized height range between canopy top and median tree returns) N/A 32-bit floating point N/A N/A N/A N/A
tree_mad Median Absolute Deviation (MAD = median(|height -­ median height|) of tree returns Meters 32-bit floating point N/A N/A N/A N/A
tree_aad Mean Absolute Deviation (AAD = mean(|height ‐ mean height|) of tree returns Meters 32-bit floating point N/A N/A N/A N/A
tree_crr Canopy Relief Ratio (CRR = mean-­min:max-­min) of tree returns N/A 32-bit floating point N/A N/A N/A N/A
tree_refl_max Maximum relative reflectance of tree single returns Fraction 32-bit floating point N/A N/A N/A N/A
tree_refl_mean Mean relative reflectance of tree single returns Fraction 32-bit floating point N/A N/A N/A N/A
ground_elev_mean Mean of ground return elevations Meters 32-bit floating point N/A N/A N/A N/A
ground_slope Mean slope derived from gridded DTM Degree 32-bit floating point N/A N/A N/A N/A
ground_aspect Aspect derived from gridded DTM Degree 32-bit floating point N/A N/A N/A N/A
ground_refl_max Maximum relative reflectance of ground single returns Fraction 32-bit floating point N/A N/A N/A N/A
ground_refl_mean Mean relative reflectance of ground single returns Fraction 32-bit floating point N/A N/A N/A N/A
nmbu_tree_d0 Density deciles (0% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
nmbu_tree_d1 Density deciles (10% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
nmbu_tree_d2 Density deciles (20% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
nmbu_tree_d3 Density deciles (30% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
nmbu_tree_d4 Density deciles (40% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
nmbu_tree_d5 Density deciles (50% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
nmbu_tree_d6 Density deciles (60% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
nmbu_tree_d7 Density deciles (70% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
nmbu_tree_d8 Density deciles (80% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
nmbu_tree_d9 Density deciles (90% increment) of tree return Fraction 32-bit floating point N/A N/A N/A N/A
dsm_rugosity Digital Surface Model Rugosity Meters 32-bit floating point N/A N/A N/A N/A
dsm_mean Digital Surface Model Mean Meters 32-bit floating point N/A N/A N/A N/A
chm_rugosity Canopy Height Model Rugosity Meters 32-bit floating point N/A N/A N/A N/A
chm_mean Canopy Height Model Mean Meters 32-bit floating point N/A N/A N/A N/A

Product Quality

Information for the GLMETRICS product can be found on the G-LiHT website.

Known Issues

Science Data Layers do not currently reflect valid Fill Value, No Data Value, Valid Range, or Scaling Factor. These will be updated when more information is available.


About the image

GLMETRICS Mean Ground Elevation layer, acquired over Bowie, Maryland in June 2012.

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Citation

DOI: 10.5067/Community/GLIHT/GLMETRICS.001

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