6aa3ff62-d210-5aad-4290-fed8814450e1 custodian NIWA National Institute of Water and Atmospheric Research curator@niwa.co.nz Data curator 2015-09-17T10:08:02 creation ISO 19115-3 urn:ogc:def:crs:EPSG::4326 OGP NZST/NZDT MOD10 MODIS Snow product for New Zealand 2012-05-28T13:54:00 creation 2012-05-28T13:54:00 revision This Report assembles an eleven year time series for the period 2001 to 2011 of snow cover area in New Zealand. A dataset is prepared based on the MODIS/Terra Snow Cover 8-Day L3 Global 500m Grid, Version 5 data (MOD10A2.5, available from the National Snow and Ice Data Center NSIDC, Boulder, Colorado USA). The MOD10A2.5 dataset indicates the maximum snow cover extent over an eight-day compositing period. It provides a seamless coverage of snow presence at regularly spaced time intervals, while minimizing the obscuration by clouds. Each year is composed of 46 epochs, each of 8 consecutive days starting on the first day of the year and extending in to the next year. An algorithm based on a trajectory analysis of land cover through time is used to infer the status of remaining pixels obscured by cloud in the composite period. This leads to a time series of virtually cloud-free composite snow cover maps that are readily imported into GIS packages for analysis of spatial and temporal variability. This dataset was assembled to enable NIWA to assess the suitability of the MODIS MOD10 snow product for: (i) validation of output of snow models (ii) assimilation into operational snow models The data were assembled by Dr Pascal Sirguey of Otago University, under contract from NIWA. The project was sponsored by Drew Lorrey with funding from project CLCO1201, and led by Ross Woods, with advice from Tim Kerr completed principalInvestigator NIWA National Institute of Water & Atmospheric Research Andrew Lorrey Climate Applications Scientist user NIWA Tim Kerr Postdoctoral fellow vector climatologyMeteorologyAtmosphere geoscientificInformation imageryBaseMapsEarthCover New Zealand 165.5,-29 184.5,-29 184.5,-52.8 165.5,-52.8 165.5,-29 165.5 -175.5 -52.8 -29 2001-01-01T00:00:00 2011-12-31T00:00:00 snow remote sensing modis new zealand CLCO1202 theme NIWA Project Codes 2012-01-01 publication NIWA_ProjectCode Many limitations of MODIS MOD10 cloud recognition and snow cover algorithms persist into this product. Cloud maybe be misclassified as snow or vice versa. Awaiting review by Drew Lorrey on what access is appropriate eng https://dc.niwa.co.nz/niwa_dc/srv/metadata/6aa3ff62-d210-5aad-4290-fed8814450e1 WWW:LINK-1.0-http--metadata-URL Point of truth URL of this metadata record http://docs.niwa.co.nz/kerrtr/MODIS-SCA-2001-2011 WWW:LINK-1.0-http--downloaddata Link to report "Assessing the use of MOD10 MODIS Snow product for New Zealand" and images and animations" Publicly available MODIS MOD10 snow cover data were transformed by Pascal Sirguey, as described in accompanying report. "Assessing the use of MOD10 MODIS Snow product for New Zealand" Pascal Sirguey School of Surveying, University of Otago, PO Box 56, Dunedin, New Zealand May 2012 Prepared for NATIONAL INSTITUTE FOR WATER AND ATMOSPHERIC RESEARCH (NIWA) Report 12-002.001.R1.0 dataset