Normalized Difference Vegetation Index (NDVI) derived from 2013 National Agriculture Imagery Program (NAIP) data for the central Arizona region

This project calculates the Normalized Difference Vegetation Index (NDVI) from 2013 National Agriculture Imagery Program (NAIP) imagery (1-meter resolution) for the central Arizona region. Because of their large size, data (as GeoTIFF files) for each survey year are provided as fifteen individual tiles each comprising a portion of the overall coverage area. An index of the relative position of each tile in the coverage area is provided as a pdf, png, and kml where the tile index contains a portion of the GeoTIFF file name (e.g., the relative position of the data file NAIP_NDVI_CAP2013-0000000000-0000000000.tif to the overall coverage area is identified by the index id 0000000000-0000000000 in the pdf, png, and kml index map). Javascript code used to process NDVI values is included with this dataset. This data set is one in a series of NDVI and SAVI (Soil Adjusted Vegetation Index) data sets for the central Arizona region spanning multiple years (2010-2017). Related data are available through the Environmental Data Initiative - see resouce listing in the methods of this data set for references.本项目针对亚利桑那州中部区域，基于2013年美国国家农业影像计划（National Agriculture Imagery Program, NAIP）的1米分辨率影像，计算归一化差分植被指数（Normalized Difference Vegetation Index, NDVI）。由于单份数据体量较大，每个调查年份的GeoTIFF格式数据被拆分为15个独立瓦片，每个瓦片仅覆盖整体研究区域的一部分。研究团队提供了pdf、png及kml格式的瓦片位置索引文件，用于标注每个瓦片在整体覆盖区域中的相对位置，该索引包含对应GeoTIFF文件名的部分信息。例如，数据文件NAIP_NDVI_CAP2013-0000000000-0000000000.tif在整体覆盖区域中的相对位置，可通过pdf、png和kml索引图中的索引ID 0000000000-0000000000进行识别。本数据集附带了用于处理NDVI数值的Javascript代码。本数据集是亚利桑那州中部区域多年份（2010-2017年）归一化差分植被指数（NDVI）与土壤调节植被指数（Soil Adjusted Vegetation Index, SAVI）系列数据集之一。相关数据可通过环境数据倡议组织（Environmental Data Initiative, EDI）获取，具体参考文献可参见本数据集方法部分的资源列表。