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Alien Plant Threat Assessment

Published by National Park Service | Department of the Interior | Catalog Last Checked: January 25, 2026 at 05:24 PM | Dataset Last Updated: May 29, 2018 at 12:00 AM
Data on alien (non-native) plant species surveys within the boundaries of disturbed sites within Yosemite National Park. Surveys were supplemented by quadrat-based subsampling of some campgrounds, camps, developments and corrals to obtain native/non-native species ratios. Surveys primarily targeted areas of human disturbance, such as campgrounds, corrals, developments, roads, trails and pastures, where alien plant species were most likely to be introduced and dispersed.

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Complete Metadata
@type dcat:Dataset
accessLevel public
bureauCode 
                                            [
  "010:24"
]
contactPoint 
                                            {
  "fn": "NPS IRMA Help",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:NRSS_DataStore@nps.gov"
}
description Data on alien (non-native) plant species surveys within the boundaries of disturbed sites within Yosemite National Park. Surveys were supplemented by quadrat-based subsampling of some campgrounds, camps, developments and corrals to obtain native/non-native species ratios. Surveys primarily targeted areas of human disturbance, such as campgrounds, corrals, developments, roads, trails and pastures, where alien plant species were most likely to be introduced and dispersed.
distribution 
                                            [
  {
    "@type": "dcat:Distribution",
    "title": "TRAIL_USE_LEVEL.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Categorical use level assigned to trails surveyed in 1998 and 1999. Used levels supplied by Wilderness Office, Yosemite National Park in 1998.",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601844?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "AlienPlantSpeciesAssessment-YOSE.7z",
    "format": "7z",
    "mediaType": "application/octet-stream",
    "description": "Compressed archive of files including data and documentation",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601828?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "SUBSAMPLE_COVER1998.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Data from quadrat subsamples of campgrounds, developments, and corrals surveyed in 1998",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601841?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "SUBSAMPLE_COVER1999.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Data from quadrat subsamples of campgrounds, developments, and corrals surveyed in 1999",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601842?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "LINEAR_SURVEYS.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Data on plant species occurrence recorded during surveys of travel corridors (roads and trails) in 1998 and 1999 in Yosemite NP",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601837?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "SHRUB_LINEINT1998.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Data on shrub intercept transects",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601838?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "TREE_CANOPY1998.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Data on tree canopy cover from point transects at alien plant survey sites in Yosemite in 1998",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601846?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "TREE_CANOPY1999.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Data tree canopy cover from point transects at sites surveyed for alien plant species in Yosemite in 1999",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601847?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "AlienPlantThreatAssessment-YOSE_FieldForm1999.pdf",
    "format": "pdf",
    "mediaType": "application/pdf",
    "description": "Field form used in 1999",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601833?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Alien_Plant_Threat_Assessment-YOSE_Methods.pdf",
    "format": "pdf",
    "mediaType": "application/pdf",
    "description": "Field methods used in 1998 and 1999 to collect alien plant species occurrence data in disturbed sites of Yosemite",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601831?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "tblAccessioned_Plant_Specimens.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Herbarium label data from plant specimens collected during surveys of disturbed areas in Yosemite in 1998 and 1999. Specimens are housed at Yosemite National Park herbarium.",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601843?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "TRANSECT_LENGTH_1998.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Length (m) of transects randomly placed to subsample areas surveyed for alien plant species in Yosemite in 1998",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601845?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "USGSQuad.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Lookup table for USGS quadrangle map codes used in SITE table",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601848?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "JFLORA.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Lookup table for codes used to represent vascular plant species recorded during alien plant species assessment surveys (nomenclature: Hickman. 1993. The Jepson Manual, 1st Edition)",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601836?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "VOLUNT.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Plant counts by species recorded by volunteers doing mechanical control (hand pulling, string trimmers) under the direction of National Park Service staff",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601849?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "AREA_SURVEYS.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Survey data from campgrounds, developments, and corrals in Yosemite from 1998 and 1999",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601835?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "SITE.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "Survey site descriptions, including location and environmental setting",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601840?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Alien_Plant_Species_Assessment-Yosemite_Readme.txt",
    "format": "txt",
    "mediaType": "text/plain",
    "description": "Table by table field definitions (metadata)",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601830?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Gerlach_etal2003_AlienPlantThreatAssess-ofr02170.pdf",
    "format": "pdf",
    "mediaType": "application/pdf",
    "description": "U.S. Geological Survey Open File Report summarizing and analyzing data resulting from alien plant surveys of disturbed areas in Yosemite, Sequoia, and Kings Canyon National Park.",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601850?Reference=2253446"
  },
  {
    "@type": "dcat:Distribution",
    "title": "ALL_SURVEY_COORDS.csv",
    "format": "csv",
    "mediaType": "text/csv",
    "description": "UTM coordinates for sites surveyed in 1998 and 1999",
    "downloadURL": "https://irma.nps.gov/DataStore/DownloadFile/601834?Reference=2253446"
  }
]
identifier http://datainventory.doi.gov/id/dataset/NPS_DataStore_2253446
issued 2018-05-29T00:00:00Z
keyword 
                                            [
  "Ecological Framework: Biological Integrity | Invasive Species | Invasive/Exotic plants",
  "alien plants",
  "disturbance",
  "exotic species",
  "non-native invasive species",
  "plant surveys"
]
landingPage https://irma.nps.gov/DataStore/Reference/Profile/2253446
modified 2018-05-29T00:00:00Z
programCode 
                                            [
  "010:118",
  "010:119"
]
publisher 
                                            {
  "name": "National Park Service",
  "@type": "org:Organization"
}
spatial -121.646149,34.9317169,-116.997093,41.38846
temporal 1998-01-01/2003-01-01
theme 
                                            [
  "Generic Dataset"
]
title Alien Plant Threat Assessment

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