Vacant and Developed Land 1990
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The undeveloped land layer represents lands appearing unimproved on aerial photography, without regard to developability and accessibility. On partially developed parcels, only undeveloped areas 1/2 acre or larger are included. Metro's Vacant Land Definitions: Every tax lot is determined to be vacant, partially vacant, or developed. Vacant tax lots are those that have no building, improvements or identifiable land use. Developed lots must have improvements and specific land uses. For example, a paved parking lot is developed but an unpaved lot where trucks are parked is vacant. Lots under site development show building activity, but development is incomplete and they are considered vacant. If a developed tax lot has 1/2 acre (20,000-sq. ft.) or greater portion that is vacant, the lot is considered to be partially vacant and partially developed. The vacant portion is added to the vacant land database. Parks and open spaces are treated as developed. During the assessment of each tax lot, no consideration is given to constrained land, suitability for building, or to redevelopment potential. Date of last data update: 1990-06-30 This is official RLIS data. Contact Person: Al Mowbray al.mowbray@oregonmetro.gov Emailing the contact person listed above is the fastest way to get a response, but if you prefer to call, you can contact the Data Resource Center at 503-797-1742 and someone will return your call as soon as they are able. RLIS Metadata Viewer: https://gis.oregonmetro.gov/rlis-metadata/#/details/2931 Terms of Use: https://rlisdiscovery.oregonmetro.gov/pages/open-database-license
未开发土地图层（undeveloped land layer）指航空影像上呈现为未改造状态的土地，不考量其可开发性与可达性。 对于部分已开发地块，仅纳入面积不小于0.5英亩的未开发区域。 都会区（Metro）的空地定义如下：所有计税地块（tax lot）均被划分为空地、部分空地或已开发地块三类。空地计税地块指无建筑物、改造设施或可识别土地用途的地块；已开发地块则必须具备改造设施与明确的土地用途。例如，铺装停车场属于已开发地块，而停放卡车的未铺装场地则被归类为空地。处于场地开发阶段的地块存在建筑施工活动，但开发尚未完成，因此被认定为空地。若某已开发计税地块存在面积不小于0.5英亩（20000平方英尺）的空置区域，则该地块将被判定为部分空地与部分已开发地块，其空置区域将被纳入空地数据库。 公园与开放空间均被视为已开发地块。 在对每个计税地块进行评估时，无需考虑受限土地、建筑适宜性或再开发潜力。 最后数据更新日期：1990年6月30日 本数据为官方区域土地信息系统（RLIS）数据。 联系人：阿尔·莫布雷（Al Mowbray），邮箱：al.mowbray@oregonmetro.gov 通过上述联系人发送邮件是获取回复的最快途径；若您希望致电咨询，可拨打数据资源中心电话503-797-1742，工作人员将尽快回电。 RLIS元数据查看器：https://gis.oregonmetro.gov/rlis-metadata/#/details/2931 使用条款：https://rlisdiscovery.oregonmetro.gov/pages/open-database-license
