Land use, 2005, Ipswich Watershed, Parker Watershed, Plum Island Ecosystem, Massachusetts - vector

This is a statewide, seamless digital dataset of land use / land cover for the State of Massachusetts derived using semi-automated methods and based on digital imagery captured in 2005 with 0.5 m pixel resolution. The project area encompasses the State of Massachusetts. The minimum mapping unit (MMU) for this dataset is 1 acre overall for the dataset. However, there are some exceptions: a MMU of 0.5 acre has been used for rural areas where there may be isolated residential, commercial, or industrial structures. In such cases, areas less than 1 acre and more than about 0.5 acre are mapped. In urban areas, the MMU is 1 acre. This implies that a water tower or a communication tower in the middle of a residential or commercial area may not be mapped out separately if it occupies less than 1 acre of land. In areas where assessor parcel data was available, Multi-family Residential, Commercial, and Industrial areas may be as small as 0.25 acre. The land use classification scheme used for these data is based on a coding schema used in previous land use datasets in Massachusetts with some modifications for the 2005 classification. Note: Complete metadata is available within the downloaded zip file. This metadata can be viewed with ESRI ArcGIS software, and can be exported to FGDC and ISO metadata formats.

本数据集为马萨诸塞州（Massachusetts）全域无缝土地利用/土地覆被数字数据集，采用半自动化方法生成，基于2005年采集的0.5米像素分辨率数字影像制作。本数据集覆盖范围为马萨诸塞州全域。本数据集的整体最小制图单元（minimum mapping unit, MMU）为1英亩，但存在部分例外：针对存在孤立住宅、商业或工业建筑的农村区域，采用0.5英亩的最小制图单元，此类区域中面积介于约0.5英亩至1英亩之间的地块将被绘制。城市区域的最小制图单元仍为1英亩，这意味着若住宅或商业区域内的水塔、通信塔占地不足1英亩，则不会单独绘制其边界。在可获取评估地块数据的区域，多户住宅、商业及工业用地的最小制图单元可低至0.25英亩。本数据集采用的土地利用分类体系，基于马萨诸塞州既往土地利用数据集的编码框架，并针对2005年的分类需求进行了部分调整。备注：完整元数据可在下载的压缩包中获取，可通过ESRI ArcGIS软件查看，并可导出为FGDC及ISO元数据格式。