Historical built-up intensity layer series for the U.S. 1810 - 2015

These files are part of the dataset "Historical built-up intensity layer series for the U.S. 1810 – 2015", contained in the dataverse “HISDAC-US: Historical Settlement Data Compilation for the United States” (https://dataverse.harvard.edu/dataverse/hisdacus). The BUI.tar.gz archive contains a time series if geospatial raster layers with pixel values representing the built-up intensity (BUI, i.e., the sum of indoor areas of all structures in that pixel) at 250m spatial resolution and 5 years temporal resolution. The other archives contain positional, thematic and temporal uncertainty layers (or raster series). The files are organized in .tar.gz archives. The readme file provides additional information. Data source: Zillow Transaction and Assessment Dataset (ZTRAX), Zillow Inc. -- Corrigendum: (1) In the original version 1.0 the unit for the BUI layers was described as square meters but the raster values were computed in square feet. This has been corrected in this new version and the raster values of all BUI layers are now correctly calculated in square meters; (2) The spatial reference system used to project the layers was incorrectly described in version 1.0. This has been corrected in this new version.

本批文件属于数据集"1810–2015年美国历史建成区强度序列数据集"，存储于哈佛数据文卷（Dataverse）平台的"HISDAC-US：美国历史定居点数据汇编"合集中（https://dataverse.harvard.edu/dataverse/hisdacus）。BUI.tar.gz归档文件包含一组空间栅格图层时间序列，其像素值代表250米空间分辨率、5年时间分辨率下的建成区强度（Built-up Intensity，简称BUI，即该像素内所有建筑的室内面积总和）。其余归档文件则包含位置、主题与时间不确定性图层（或栅格序列）。所有文件均以.tar.gz归档格式组织。自述文件（readme）提供了额外补充信息。数据来源：齐洛（Zillow）公司交易与评估数据集（ZTRAX）。勘误说明：(1) 在1.0版本中，BUI图层的单位被描述为平方米，但实际栅格值是以平方英尺计算的。本新版本已修正该问题，所有BUI图层的栅格值现已正确以平方米为单位；(2) 1.0版本中对图层投影所用的空间参考系统描述有误，本新版本已完成修正。