Science Keywords>CLIMATE INDICATORS
USGS JECAM Canada South NationEntry ID: USGS_JECAM_Canada_South_Nation
Abstract: Joint Experiment for Crop Assessment and Monitoring
The overarching goal of JECAM is to reach a convergence of approaches, develop monitoring and reporting protocols and best practices for a variety of global agricultural systems. JECAM will enable the global agricultural monitoring community to compare results based on disparate sources of data, using various methods, over a variety of global ... cropping systems. It is intended that the JECAM experiments will facilitate international standards for data products and reporting, eventually supporting the development of a global system of systems for agricultural crop assessment and monitoring. The JECAM initiative is developed in the framework of GEO Global Agricultural Monitoring (GEOSS Task AG0703 a) and Agricultural Risk Management (GEOSS Task AG0703 b).
Purpose: To achieve the JECAM goals the initiative will bring together the GEO Agricultural Monitoring Community of Practice to undertake an inter-comparison of monitoring and modeling methods, product accuracy assessments, and data fusion. JECAM will take place on a finite set of regional pilot sites that are representative of a range of global agricultural systems. Data collected and shared will include ... time series datasets from a variety of earth observing satellites and in-situ data which may include in situ ground survey, in-situ soil moisture monitoring and meteorological data. The Community of Practice will work with the Committee on Earth Observing Satellites (CEOS) the space-arm of GEO, and other data providers to facilitate the acquisition of Earth Observation data and ensure a coordinated approach to space based data acquisition.
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Data Set Citation
Dataset Originator/Creator: U.S. Geological Survey
Dataset Title: USGS JECAM
Dataset Release Date: 2011
Dataset Publisher: U.S. Geological SurveyOnline Resource: http://www.umanitoba.ca/outreach/aesb-jecam/
Start Date: 2011-05-25
Latitude Resolution: 30m
Longitude Resolution: 30m
AGRICULTURE > AGRICULTURAL PLANT SCIENCE
AGRICULTURE > AGRICULTURAL PLANT SCIENCE > CROP/PLANT YIELDS
AGRICULTURE > AGRICULTURAL PLANT SCIENCE > CROPPING SYSTEMS
AGRICULTURE > FOOD SCIENCE
AGRICULTURE > PLANT COMMODITIES > FIELD CROP PRODUCTS
BIOSPHERE > TERRESTRIAL ECOSYSTEMS > AGRICULTURAL LANDS
BIOSPHERE > VEGETATION > VEGETATION COVER
BIOSPHERE > VEGETATION > VEGETATION SPECIES
CLIMATE INDICATORS > LAND SURFACE/AGRICULTURE INDICATORS
CLIMATE INDICATORS > LAND SURFACE/AGRICULTURE INDICATORS > VEGETATION COVER
HUMAN DIMENSIONS > ECONOMIC RESOURCES > AGRICULTURE PRODUCTION
Quality This mosaic was created from a series of photographs covering the coastline of the Laurens Peninsula captured during 1980 using a Hasselblad camera: film CASC9495 frames 51-56 and 58-60. A single photo captured using a Linhof camera in 1987/88 was also used: film ANTC1210 run 2 frame 182.
Dr Jenny Scott visited Heard Island during 2000 to conduct vegetation surveys. Dr Scott used the ... photography as a base for her mapping and also used a global positioning system to coordinate control points in the photography.
A digital elevation model was obtained from Radarsat using 1997 radar imagery.
The aerial photographs were ortho rectified using the ground control obtained by Dr Scott, and additional derived points read off the Orthorectified Digital Globe image for Laurens Peninsula, and the digital elevation model obtained from Radarsat. The inner orientation parameters for the cameras were unknown but the focal length was derived by first measuring the diagonal distance across the negative (this gave an approximate focal length). The final value for the focal length was computed using the ERDAS OrthoBase Pro Self Calibrating Bundle Adjustment software. The focal length adopted for the camera was 82mm. The ERDAS software was used to perform a bundle adjustment on the photography using the ground control and tie points. The bundle adjustment resulted in average RMS errors of +/-6m in position and height (XY and Z).
For the residuals from the adjustment refer to the PDF available for download (see Related URL below).
Each image was then ortho rectified using the orientation parameters derived from the bundle adjustment and the Radarsat DEM. The orthorectified images were then joined to form an image mosaic for the Laurens Peninsula. The image mosaic was not colour balanced. The pixel size on the ground for each image is 0.82m. The image was projected to UTM Zone 43 (WGS84).
The adjustment accuracies achieved with aerial triangulation however are not indicative of the true position of the images.
The following factors affect the absolute position of the images:
1- The focal length used for the camera is only an estimate. It is not possible to perform an accurate calibration of the camera from the supplied ground control points. This will have a direct effect on the initial scale of the images which could result in some distortion of features.
2- Not all the coordinated Ground Control Points could be used in the adjustment.
3- The overlap of the images is minimal on some images. This makes the aerial triangulation process less robust.
4- Cloud cover on the images makes the location of tie points between images difficult, narrowing the range in which they can be placed.
Hence although the adjustment accuracy is to within +/-6m the absolute position of the mosaic is only +/- 160m
The coverage of the aerial photos is shown by the polygon shapefile available for download (see Related URL below).
Access Constraints Contact the technical contact at the AADC for access to the data. Access is restricted due to the size of the mosaic. The mosaic will be made available on CD. The mosaic is in ERDAS Imagine format and is 582 Mb.
Use Constraints This data set conforms to the PICCCBY Attribution License
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=photo_mo... when using these data.
Data Set Progress
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6232 3519
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Australian Antarctic Division 203 Channel Highway
Province or State: Tasmania
Postal Code: 7050
Creation and Review Dates
DIF Creation Date: 2007-11-27
Last DIF Revision Date: 2011-05-10