Indiana University - Indiana - Hemlocks - 2005-2013

Latest version published by United States Geological Survey on Dec 4, 2019 United States Geological Survey
Publication date:
4 December 2019
CC0 1.0

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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.

Data Records

The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 1,458 records.

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.


The table below shows only published versions of the resource that are publicly accessible.

How to cite

Researchers should cite this work as follows:

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


Researchers should respect the following rights statement:

The publisher and rights holder of this work is United States Geological Survey. To the extent possible under law, the publisher has waived all rights to these data and has dedicated them to the Public Domain (CC0 1.0). Users may copy, modify, distribute and use the work, including for commercial purposes, without restriction.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: f16589a9-1c6e-4e91-b683-d5018aed4b81.  United States Geological Survey publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF-US.


Occurrence; plants; species; land cover and land use; null; Observation


F. Collin Hobbs
  • Metadata Provider
  • Originator
  • Point Of Contact
Assistant Professor
Huntington University
2303 College Avenue
46750 Huntington
+1(260) 359-4201
Annie Simpson
  • Originator
biologist & information scientist
US Geological Survey
12201 Sunrise Valley Drive, Mailstop 302
20192 Reston

Geographic Coverage

The distribution of all smaller plots of hemlock within the state of Indiana in the United States.

Bounding Coordinates South West [38.242, -87.301], North East [40.022, -85.528]

Taxonomic Coverage

Tsuga canadensis (L.) Carrière -- eastern hemlock

Species Tsuga canadensis (eastern hemlock)

Temporal Coverage

Start Date / End Date 2005-01-01 / 2013-01-01

Project Data

No Description available

Title Distribution of Tsuga canadensis in Indiana - locations of less than 1000m2
Study Area Description 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.

The personnel involved in the project:

F. Collin Hobbs
  • Author

Sampling Methods

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.

Study Extent 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.
Quality Control The analysis of the aerial imagery for presence/absence of eastern hemlock was followed by physical visits to sites where hemlocks were expected.

Method step description:

  1. 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.

Collection Data

Collection Name Charles Deam
Collection Identifier
Parent Collection Identifier not applicable
Specimen preservation methods Dried and pressed

Bibliographic Citations

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

Additional Metadata

Alternative Identifiers f16589a9-1c6e-4e91-b683-d5018aed4b81