Landsat and MODIS data for the Lower Gwydir Catchment study site

The Lower Gwydir Catchment study site is located in northern NSW (149.2815E, 29.0855S), where 14 cloud–free Landsat-MODIS pairs were available from April 2004 to April 2005. Gwydir is 80 km N–S and 68 km E–W covering 5,440 km2 (3200 columns by 2720 lines at 25 m resolution). All Landsat imagery are TM acquired by Landsat-5. A separate folder contains a binary image for masking inundated areas used for evaluation of accuracy of blending algorithms in land cover specific areas as described in the following citation: \r\n\r\nEmelyanova IV, McVicar TR, Van Niel TG, Li LT, van Dijk AIJM (2012) On blending Landsat-MODIS surface reflectances in two landscapes with contrasting spectral, spatial and temporal dynamics. WIRADA Project 3.4: Technical report, 72 pp, CSIRO. Australia, https://publications.csiro.au/rpr/pub?list=SEA&pid=csiro:EP128838. \nLineage: The Landsat imagery were atmospherically corrected using Li et al.’s (2010) algorithm (see the citation below). Geocorrection was defined using the Geocentric Datum of Australia 1994 (GDA94). MODIS Collection 5 data were acquired by Terra only, specifically MOD09GA downloaded from the USGS DAAC (ftp://e4ftl01.cr.usgs.gov/MOLT/, during Sep 2011). MODIS data were geometrically transformed from the USGS DAAC supplied tiles which have a sinusoidal projection to WGS84 using the MODIS Reprojection Tool (https://lpdaac.usgs.gov/lpdaac/tools/modis_reprojection_tool, accessed 27 Sep 2011). MODIS data were unprojected and referenced to World Geodetic System 1984 (WGS84) . \r\n\r\nLi, F., Jupp, D. L. B., Reddy, S., Lymburner, L., Mueller, N., Tan, P., & Islam, A. (2010). An Evaluation of the Use of Atmospheric and BRDF Correction to Standardize Landsat Data. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 3(3), 257-270.

下吉迪尔流域（Lower Gwydir Catchment）研究样区位于新南威尔士州（New South Wales, NSW）北部，坐标为东经149.2815、南纬29.0855。2004年4月至2005年4月间，该区域共获取14幅无云的Landsat-MODIS影像对。该样区南北长80 km，东西宽68 km，总面积5440 km²（分辨率25 m时为3200列×2720行）。所有Landsat影像均为Landsat-5搭载的专题制图仪（Thematic Mapper, TM）所获取的数据。

另有独立文件夹存储用于掩膜淹没区域的二值影像，可按照下述文献所述方法，针对特定土地覆盖区域评估融合算法的精度：
引用文献：Emelyanova IV, McVicar TR, Van Niel TG, Li LT, van Dijk AIJM (2012) 两种具备差异化光谱、空间与时间动态特征的景观中Landsat-MODIS地表反射率融合方法研究。WIRADA项目3.4：技术报告，共72页，澳大利亚联邦科学与工业研究组织（CSIRO），澳大利亚。https://publications.csiro.au/rpr/pub?list=SEA&pid=csiro:EP128838.

数据溯源：本研究中的Landsat影像采用Li等人（2010）提出的算法完成大气校正（详见下述引用文献）。几何校正采用澳大利亚地心坐标系1994（Geocentric Datum of Australia 1994, GDA94）。MODIS Collection 5数据仅来源于Terra卫星，具体为2011年9月从美国地质调查局数据分发中心（USGS DAAC）的ftp服务器（ftp://e4ftl01.cr.usgs.gov/MOLT/）下载的MOD09GA产品。利用MODIS重投影工具（https://lpdaac.usgs.gov/lpdaac/tools/modis_reprojection_tool，2011年9月27日访问），将USGS DAAC提供的正弦投影分块MODIS数据转换至世界大地测量系统1984（World Geodetic System 1984, WGS84）。最终MODIS数据经去投影处理后，统一参考WGS84坐标系。

Li, F., Jupp, D. L. B., Reddy, S., Lymburner, L., Mueller, N., Tan, P., & Islam, A. (2010). 大气校正与双向反射分布函数（Bidirectional Reflectance Distribution Function, BRDF）校正用于标准化Landsat数据的效果评估。IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 3(3), 257-270.