Giant Sequoia Stands

The population of giant sequoia ( Sequoiadendron giganteum [SEGI]) trees is an irreplaceable heritage to be studied, protected, and preserved as it faces increased threats from drought and fire. This species is only found in the Sierra Nevada Region and thus the data are only from that Region.

Data and Resources

Additional Info

Field Value
Version Version 5.0
Last Updated March 28, 2025, 08:36 (UTC)
Created March 7, 2025, 07:52 (UTC)
categorical_values {"0": 117965279, "1": 114364}
category /Biodiversity Conservation/Focal Species/Plants
collection_name California Landscape Metrics
creation_method The Giant Sequoia grove locations are well described, and their approximate delineations have been used for analysis work for years with the Administrative Grove Boundary (AGB) dataset. These AGB polygons were exaggerated for a variety of reasons and led to erroneous analysis results. An explicit delineation of SEGI populations was needed, especially as the range of the tree is exposed to increased threats instigated by a mega-drought not seen in the region in over a millennia. This dataset addressed that need across the entire range of SEGI. While some 70+ "Groves" are recognized with the AGB dataset; the historic naming conventions of groves lost to generalization have been reapplied for this work, referencing each distinct area as a "Map Unit." Consider 'Grove' a general term with 'Map Unit' a distinct population distribution for a unique SEGI population. There are 94 Map Units as of 2022 covering 26,270 acres. To create the Map Unit linework, individual SEGI pints were identified, both remotely and in the field, to inform the boundary line work. In the case of the National Park Map Units, the historic Sequoia Tree Inventory (STI) dataset dictated the boundary shape. Elsewhere, the Observed Tree Inventory (OTI) points guided the boundary formation. For this effort, the giant sequoia stand polygons were subsequently converted to a raster grid at 30m resolution based on existence/non-existence.
data_units Binary, 1 = existence, 0 = nonexistence
data_vintage 2022
date_updated August 2024
element Focal Species
encoding utf8
file_name GiantSequoiaMapUnits_2022_202209_T2_v5
format GeoTiff
harvest_object_id 6d6b95f7-b7d1-4066-99d9-5e07f33407a3
harvest_source_id a2637971-af12-457f-ae4a-831d2202a539
harvest_source_title WIFIRE Commons
maximum_value 1.0
metric_definition_and_relevance The population of giant sequoia ( _Sequoiadendron giganteum_ [SEGI]) trees is an irreplaceable heritage to be studied, protected, and preserved as it faces increased threats from drought and fire. This species is only found in the Sierra Nevada Region and thus the data are only from that Region.
minimum_value 0.0
pillar Biodiversity Conservation
spatial {"type": "Polygon", "coordinates": [[[-122.2883616476824, 35.05769372687348], [-117.5563290826801, 35.05769372687348], [-117.5563290826801, 42.00332292672577], [-122.2883616476824, 42.00332292672577], [-122.2883616476824, 35.05769372687348]]]}
sub_element Plants
tier 2