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Hemispherical Photographs at Remote Camera Stations on Moscow Mountain in Latah County, ID, USA (6/2/21-11/2/21)

Metadata Updated: June 15, 2024

We took hemispherical photographs (hemiphotos) at each camera station to estimate incoming shortwave radiation. We used a Canon EOS 70D SLR camera with a Sigma 8mm circular fisheye lens. We took hemiphotos on days with little to no wind or precipitation and early in the morning (5AM – 7AM), late in the evening (7PM – 9PM), or on overcast days to maximize the contrast between sky and vegetation. We took hemiphotos in June - July 2021, but nine camera sites were re-photographed in October 2021 due to poor quality of initial photographs. Overstory deciduous vegetation is rare at the study site, so summer changes in canopy cover are negligible. At each camera site, we placed the DSLR camera with attached lens on a tripod and levelled it to point directly up into the canopy. One set of hemiphotos was taken at the tree to which the camera was mounted, and a second was taken 5 m into the camera viewshed. We took photographs at multiple exposures using the auto-exposure bracketing settings of the camera. We analyzed hemiphotos using Hemisfer software. We selected the hemiphoto with the best exposure for each location at a camera site. We manually selected threshold values and adjusted color-weighting when needed to distinguish sky pixels from vegetation pixels in each image. Hemisfer then classified sky and vegetation pixels in the photograph using the threshold, overlaid a solar path onto photographs based on input georeferencing information and photograph orientation. We set Hemisfer to calculate hourly direct and diffuse shortwave radiation throughout time assuming 50% cloud cover. Hemisfer also output a count of sky and vegetation pixels in the image which we used to calculate percent vegetation cover. Photographs were analyzed using the attributes listed in the .csv file (this dataset) in Hemisfer software.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Created Date June 1, 2023
Metadata Updated Date June 15, 2024

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date June 15, 2024
Publisher Climate Adaptation Science Centers
Maintainer
@Id http://datainventory.doi.gov/id/dataset/29316dbcf1173db8da1b301b31255371
Identifier 5933c465-9e53-45ad-acbc-97de98bdc4a0
Data Last Modified 2023-03-15
Category geospatial
Public Access Level public
Bureau Code 010:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://datainventory.doi.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id a2f736e0-bc4d-4758-9702-b590136255d0
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -116.86,46.78,-116.83,46.82
Source Datajson Identifier True
Source Hash f8583f360dc56553fc2f756c18960f04c2853b0baacbb32f8be67fcc1b41477b
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -116.86, 46.78, -116.86, 46.82, -116.83, 46.82, -116.83, 46.78, -116.86, 46.78}

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