Soil-Adjusted Vegetation Index (SAVI) derived from 2015 National Agriculture Imagery Program (NAIP) data for the central Arizona region

This project calculates the Soil-adjusted Vegetation Index (SAVI) from 2015 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 multiple 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 and kml where the tile index contains a portion of the GeoTIFF file name (e.g., the relative position of the data file NAIP_SAVI_CAP2015-0000000000-0000000000.tif to the overall coverage area is identified by the index id 0000000000-0000000000 in the pdf and kml index maps). Javascript code used to process SAVI 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.

本项目基于2015年美国国家农业影像计划（National Agriculture Imagery Program, NAIP）的1米分辨率影像，针对亚利桑那州中部区域计算土壤调节植被指数（Soil-adjusted Vegetation Index, SAVI）。由于数据体量庞大，每个调查年度的GeoTIFF格式数据被拆分为多个独立瓦片，各瓦片仅覆盖整体研究区域的一部分。本数据集提供了一份记录各瓦片在整体覆盖区域中相对位置的索引文件，该索引以PDF和KML格式存储，其中瓦片索引包含对应GeoTIFF文件的部分文件名：例如，数据文件NAIP_SAVI_CAP2015-0000000000-0000000000.tif在整体覆盖区域中的相对位置，可通过PDF和KML索引地图中的索引ID 0000000000-0000000000进行识别。本数据集附带了用于计算SAVI值的JavaScript代码。本数据集是亚利桑那州中部区域2010至2017年多年度归一化植被指数（Normalized Difference Vegetation Index, NDVI）与SAVI系列数据集之一。相关数据可通过环境数据倡议（Environmental Data Initiative）获取，具体参考文献可参见本数据集方法部分的资源列表。