Indiana University - Indiana - Hemlocks - 2005-2013

F. Collin Hobbs1, Annie Simpson2

1 Huntington University, 2303 College Avenue, 46750, Huntington, United States; 2 US Geological Survey, 12201 Sunrise Valley Drive, Mailstop 302, 20192, Reston, United States

Corresponding author(s): F. Collin Hobbs (chobbs@huntington.edu)Annie Simpson (asimpson@usgs.gov)

Received {date}; Revised {date}; Accepted {date}; Published {date}

Citation: Combination of authors, year of data paper publication (in parentheses), Title, Journal Name, Volume, Issue number (in parentheses), and doi of the data paper.

Resource Citation

Hobbs, F. Collin. 2013. The biogeography and phylogeography of disjunct eastern hemlock (Tsuga 
canadensis) populations. Indiana University Doctoral Thesis.

Abstract

As part of a research thesis, aerial imagery for the state of Indiana was examined for evidence of eastern hemlock occurrences. The distribution of Tsuga canadensis in Indiana was reviewed using aerial imagery and followed up by selected ground truthing. This dataset shows locations of less than 1000m2 (non-solid stands).  Based on images from 2005, locations randomly selected were visited on foot to verify the presence of the species, through 2013.

Keywords: Occurrence, plants, species, land cover and land use, null, Observation

Project details

Project title: Distribution of Tsuga canadensis in Indiana - locations of less than 1000m2
Personnel: F. Collin Hobbs
Study area descriptions/descriptor: State of Indiana, from aerial imagery and ground truthing.
Design description: Aerial imagery for the state of Indiana was examined for evidence of eastern hemlock occurrences. Based on images from 2005, locations randomly selected were visited on foot to verify the presence of the species, through 2013.

Data published through GBIF: https://bison.usgs.gov/ipt/resource?r=indianauniv-hemlocks-under1000m2-2005-2013

Taxonomic coverage

General taxonomic coverage description: Tsuga canadensis (L.) Carrière -- eastern hemlock
Taxonomic ranks
Species: Tsuga canadensis
Common names: eastern hemlock

Spatial coverage

General spatial coverage: The distribution of all smaller plots of hemlock within the state of Indiana in the United States.
Coordinates: 38°14'31.2''N and 40°1'19.2''N Latitude; 87°18'3.6''W and 85°31'40.8''W Longitude 

Temporal coverage: 2005 - 2013

Natural collections description

Parent collection identifier: not applicable
Collection name: Charles Deam
Collection identifier: http://www.bio.indiana.edu/faculty/facilities/herbarium.shtml
Specimen preservation method: Dried and pressed

Methods

Method step description: visual analysis of shp files from 2005 aerial imagery determined the distribution of eastern hemlock in the state of Indiana. Field trips were taken to verify predicted presence of the trees in randomly selected areas throughout the state. Where polygons were less than 1000m2, a centroid was calculated and is represented in this dataset. A sister dataset of grids for hemlock tree distribution for polygons greater than 1000m2 is included separately.
Study extent description: The study area was the entire state of Indiana, initially performed by referencing aerial imagery from 2005. The study included ground truthing visits and collecting samples from random plots through 2013.
Sampling description: Some localities include a name of a DNR reference coordinate, collected by Hank Huffmann around 2007 (Consists of the county followed by a unique name for the site.  Ex: "Lawrence-GuthieCreek"). All sites with "basis_of_record"  as "specimen" will have a herbarium sample collected by F. Collin Hobbs associated with it.	The majority of Charles Deam's historic herbarium samples are housed at Indiana University. Records that could be matched up with a degree of certainty to present day stands are referenced with the corresponding catalog number. R. R. Van Stockum's 1979 dissertation includes a record of his visits to eight  sites in Indiana where Tsuga canadensis was found, and are referenced where applicable.
Quality control description: The analysis of the aerial imagery for presence/absence of eastern hemlock was followed by physical visits to sites where hemlocks were expected.

Datasets

Dataset description
Object name: Darwin Core Archive Indiana University - Indiana - Hemlocks - 2005-2013
Character encoding: UTF-8
Format name: Darwin Core Archive format
Format version: 1.0
Distribution: https://bison.usgs.gov/ipt/archive.do?r=indianauniv-hemlocks-under1000m2-2005-2013
Publication date of data: 2019-12-04
Language: English
Licences of use: Public Domain (CC0 1.0)

Metadata language: English
Date of metadata creation: 2015-04-21
Hierarchy level: Dataset

References
Hobbs, F.C., Clay, K. 2015? Mapping plant distributions with multispectral aerial imagery: Tsuga 
canadensis as a case study. submitted.