MODIS Collection 5 Global Subsetting and Visualization Tool

The MODIS global subsetting and visualization tool provides customized subsets and visualizations of 13 MODIS Collection 5 land products on demand for any land area on Earth, from 1 pixel up to 201 x 201 km. Subset products are made available to the user through an interactive web page. On this page are time series plots, QC information, land cover and phenology, citation, and data download.
Users specify a location for the center point of their area of interest by either entering the geographic coordinates or selecting the location on an interactive map. The land area is then defined by specifying the desired number of kilometers Above and Below and Left and Right of the center point (recall that MODIS land products are in sinusoidal projection). Users then choose the desired MODIS land product (Table 1) and date range for this subset. After providing a valid e-mail address, the request is submitted and the subset and associated products created. The user receives an e-mail with a link to a customized Data Visualization and Download page. The tool provides time series plots of the measurement, quality information, land cover grid (land cover classification) of the area and phenology, along with an estimate of heterogeneity (Shannon richness and evenness). The land product subset data are provided in comma-separated value (*.csv) and GeoTIFF (*.tif) formats.

MODIS全球子集与可视化工具可根据用户需求，提供地球上任何陆地区域13个MODIS第5版陆地产品定制子集及可视化服务，范围从1像素至201 x 201公里不等。用户可通过交互式网页获取子集产品。网页上包含时间序列图、质量控制信息、土地覆盖与物候学、引用信息以及数据下载功能。用户可通过输入地理坐标或选择交互式地图上的位置来指定感兴趣区域的中心点。然后，通过指定中心点上方和下方、左侧和右侧所需的公里数来定义土地区域（请注意，MODIS陆地产品采用正弦投影）。用户接着选择所需的MODIS陆地产品（见表1）以及子集的日期范围。提交有效电子邮件地址后，请求被提交，并创建子集及其相关产品。用户将收到一封包含定制数据可视化与下载页面链接的电子邮件。该工具提供测量值的时间序列图、质量信息、土地覆盖网格（土地覆盖分类）以及物候学数据，并估算异质性（香农丰富度和均匀度）。土地产品子集数据以逗号分隔值（*.csv）和GeoTIFF（*.tif）格式提供。