uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/0736191bf6a03ea8e4cede20f5ce6534 Stephen Klosterman https://orcid.org/0000-0002-8542-2784 Andrew Richardson https://orcid.org/0000-0002-0148-6714 2023 English

This data set contains orthophotos in the vicinity of the EMS tower at Harvard Forest, as well as the flight logs from the unmanned aerial vehicle (UAV) used to obtain the digital images used in orthophoto creation. Orthophotos were created by mosaicking approximately 200 JPEG images from each date of observation. The orthophotos cover the spatial extent of the 250 meter resolution MODIS pixel that contains the EMS tower. Land cover types in the area of photography include deciduous and evergreen forest, and wetlands. The research goal of data collection for this data set was to observe spatial variance in plant phenology. Therefore, photos were taken from before leaf out until after leaf drop. Orthophotos were collected approximately every 5 days during spring and weekly during fall; see filenames for specific dates. The nominal spatial resolution of the orthophotos is 6 cm, however due to various factors including inaccuracy of the onboard GPS, wind-blown motion of trees, the automated orthophoto mosaicking process, and user error in final georeferencing, image analysis has been conducted at 10 m resolution. The orthophotos are available as GeoTIFF files.

canopies foliage imagery landscape leaves phenology remote sensing LTER controlled vocabulary primary production LTER core area Harvard Forest HFR LTER USA HFR default

This dataset is released to the public under Creative Commons CC0 1.0 (No Rights Reserved). Please keep the dataset creators informed of any plans to use the dataset. Consultation with the original investigators is strongly encouraged. Publications and data products that make use of the dataset should include proper acknowledgement.

Creative Commons Zero v1.0 Universal https://spdx.org/licenses/CC0-1.0.html CC0-1.0 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf294 Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.1749 -72.1696 +42.5396 +42.5375 337 348 meter 2013 2013 complete Information Manager Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 hf-im@lists.fas.harvard.edu Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 https://harvardforest.fas.harvard.edu

We used a UAV (3DR ArduCopter Quad-C model) equipped with a digital camera (Canon Powershot A3300) to capture JPEG images continuously during flights. The UAV was programmed to cover the study area (250 m MODIS pixel) in two flights of approximately 10 minutes each. Orthophotos were created from the JPEGs and estimates of image locations, derived from the image file creation times and the UAV flight logs, using the PhotoScan software (AgiSoft, St. Petersburg, Russia). Final georeferencing was performed in ERDAS IMAGINE AutoSync (Intergraph, Huntsville, AL). The log files contain many variables relating to UAV flight control. Of primary interest are the GPS logs, which are contained on the lines beginning with “GPS”. For further details on log files, see: http://ardupilot.org/copter/docs/common-downloading-and-analyzing-data-logs-in-mission-planner.html#. Additional technical details are available in Klosterman, Stephen, Eli Melaas, Jon Wang, Arturo Martinez, Sidni Frederick, John O'Keefe, David Orwig, Zhuosen Wang, Qingsong Sun, Crystal Schaaf, Mark Friedl, Andrew D. Richardson. 2018. Fine-scale perspectives on landscape phenology from unmanned aerial vehicle (UAV) photography. Agricultural and Forest Meteorology v. 248 pp. 397-407.

Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 https://harvardforest.fas.harvard.edu https://ror.org/059cpzx98 pointOfContact The Harvard Forest Long-Term Ecological Research (LTER) program examines ecological dynamics in the New England region resulting from natural disturbances, environmental change, and human impacts. National Science Foundation LTER grants: DEB-8811764, DEB-9411975, DEB-0080592, DEB-0620443, DEB-1237491, DEB-1832210. hf294-01-site-map.png site map hf294-01-site-map.png 5222533 a1f271b7ced8246020ea2bdbdfe4f9c4 none png https://harvardforest.fas.harvard.edu/data/p29/hf294/hf294-01-site-map.png image hf294-02-A2013-photos.zip site A 2013 orthophotos hf294-02-A2013-photos.zip 684489781 69876c7bc20cee026ce74d9fd70eb427 zip tiff https://harvardforest.fas.harvard.edu/data/p29/hf294/hf294-02-A2013-photos.zip image hf294-03-A2013-logs.zip site A 2013 flight logs hf294-03-A2013-logs.zip 8093070 299e8bcd786ce2c9c8887051e9e94d76 zip text https://harvardforest.fas.harvard.edu/data/p29/hf294/hf294-03-A2013-logs.zip document hf294-04-A2014-photos.zip site A 2014 orthophotos hf294-04-A2014-photos.zip 552546941 07e178d0a7c435bf231a071990582a20 zip tiff https://harvardforest.fas.harvard.edu/data/p29/hf294/hf294-04-A2014-photos.zip image hf294-05-B2014-photos.zip site B 2014 orthophotos hf294-05-B2014-photos.zip 541019170 23a38a2d038ec10b3e2e80cc83df20eb zip tiff https://harvardforest.fas.harvard.edu/data/p29/hf294/hf294-05-B2014-photos.zip image hf294-06-C2015-photos.zip site C 2015 orthophotos hf294-06-C2015-photos.zip 393280417 8b54c6c2670546421fc9a3e61bfd9541 zip tiff https://harvardforest.fas.harvard.edu/data/p29/hf294/hf294-06-C2015-photos.zip image informatics community short-term measurement