2011_Spring Rhode Island Digital Orthophotographs

Contributor: Rhode Island Department of Administration, Statewide Planning Program Multispectral (4-band), 6-inch spatial resolution orthorectified digital aerial photographs of the State of Rhode Island were collected April 29 - May 2, 2011. These images were contracted by a partnership consisting of the Rhode Island Department of Environmental Management, Rhode Island Department of Transportation, United States Geological Survey, and RIGIS. Please note that most users will prefer this equivalent hosted tile layer. The primary advantages of this image service are: 1) the ability for Esri software users to be able to adjust the color of the image as best suits their needs, and 2) the ability for Esri software users to download a limited number of tiles that comprise the source data for this service. The trade-off for this flexibility is that this image service is less responsive than the pre-cached map service. These images are available from RIGIS in both GeoTIFF and JPEG2000 (JP2) formats. Metadata Web services ArcGIS Online hosted tile layer MAP SERVICE HAS BEEN DEPRECATED (REST endpoint) https://maps.edc.uri.edu/arcgis/rest/services/Atlas_imageryBaseMapsEarthCover/2011_RIDEM/MapServer ArcGIS image service, WGS84 Web Mercator (EPSG 102700) ArcGIS image service, NAD83 RI State Plane feet (ESPG 3438) KMZ Tile index shapefile Traditional file listing GeoTIFF JPEG2000 Most of the GeoTIFF formatted files are approximately 400 MB large (amounting to a total collection size of 607 GB), while the 10:1 compressed JPEG2000 formatted files are about 40 MB large (total collection size of 60 GB). The JPEG2000 file formatted files are of excellent quality and are recommended unless if you have a specific need for the larger file size.本数据集为罗德岛州行政部全州规划项目采集的罗德岛州全域多光谱（4波段）、6英寸空间分辨率正射校正数字航空影像，采集时间为2011年4月29日至5月2日。该影像由罗德岛州环境管理部、罗德岛州交通运输部、美国地质调查局及RIGIS组成的合作联合体委托采集。 请注意，多数用户会更青睐本数据集的等效托管切片图层。本影像服务的核心优势有二：其一，Esri软件用户可根据实际需求灵活调整影像色彩；其二，Esri软件用户可下载组成该服务源数据的有限数量切片。但该灵活性的代价是本影像服务的响应速度低于预缓存地图服务。 本数据集的影像可从RIGIS获取，支持GeoTIFF与JPEG2000（JP2）两种格式。 相关元数据与服务信息如下：元数据Web服务、ArcGIS Online托管切片图层（地图服务已废弃，REST端点：https://maps.edc.uri.edu/arcgis/rest/services/Atlas_imageryBaseMapsEarthCover/2011_RIDEM/MapServer）、ArcGIS影像服务（采用WGS84 Web墨卡托投影，EPSG 102700）、ArcGIS影像服务（采用NAD83 罗德岛州平面英尺坐标系，ESPG 3438）、KMZ切片索引形状文件、传统文件列表。 格式细节方面，多数GeoTIFF格式文件单文件大小约400MB，整套数据集总规模达607GB；而采用10:1压缩的JPEG2000格式文件单文件大小约40MB，整套数据集总规模为60GB。JPEG2000格式影像画质优异，除非有大文件尺寸的特定需求，否则推荐选用该格式。