Landsat 8 Natural Color mosaic, TIFF, Lake Victoria Wateshed, Raster, 2016

Zip Files Can be Downloaded From: https://drive.google.com/drive/folders/0B0A7-n4PmIvhRFNieGV6ekZtaWM Natural Color TIFF, Lake Victoria, Raster, 2016 Reference Information and Units: Spatial Reference: WGS_1984_UTM_zone_37N Geographic Datum: D_WGS_1984 Cell Size: 30, 30 (meter) Bands: 3 NoData Value: 0, 0, 0 Pixel Type: unsigned integer Pixel Depth: 16 Bit Pyramids: level: 7, resampling: Nearest Neighbor File Naming Convention: NaturalColor_Mosaic.TIF Data Origin: The original scenes were Landsat 8 data that were downloaded from the USGS. Scenes were picked that were from 2016 and had a cloud cover percentage less than 10%. One Scene was used from 2015 due to no suitable scenes being available for 2016. Data Development: This TIFF image was created using ArcGIS. To create the natural color composite each individual scene needs have the red, green, and blue bands together. Using Landsat 8 data means that red is band 4, green is band 3, and blue is band 2. When setting up the individual scene composites the no data value is set to 0. This gets ride of the black square that surrounds the TIF. Finally when the individual scenes are completed they are ready to be mosaicked. The final mosaic used a blend mosaic type. The blend type decides the output cell based on a horizontally weighted calculation of the values from the overlapping cells. This method helps clean up the output image. When the final mosaic is complete the last step was to create pyramids and calculate statistics.

压缩包可从以下地址下载：https://drive.google.com/drive/folders/0B0A7-n4PmIvhRFNieGV6ekZtaWM
本数据集为维多利亚湖区域自然色TIFF（Tagged Image File Format）栅格数据，制作于2016年。
参考信息与参数单位：
空间参考：WGS_1984_UTM第37N带（WGS_1984_UTM_zone_37N）
地理基准面：D_WGS_1984
像元大小：30×30米
波段数：3
无数据值：0, 0, 0
像素类型：无符号整数
像素位深：16比特
金字塔层级：7级
重采样方法：最邻近插值（Nearest Neighbor）
文件命名规范：NaturalColor_Mosaic.TIF
数据来源：原始影像为从美国地质调查局（United States Geological Survey，简称USGS）下载的陆地卫星8号（Landsat 8）数据，选取2016年云量占比小于10%的影像。因2016年无符合要求的可用影像，故采用1景2015年的影像完成数据集制作。
数据制作流程：本TIFF影像通过ArcGIS软件生成。制作自然色合成影像时，需将单景影像的红、绿、蓝波段进行合并。对于陆地卫星8号（Landsat 8）数据，红色波段对应第4波段，绿色波段对应第3波段，蓝色波段对应第2波段。在配置单景影像合成参数时，将无数据值设为0，以消除TIFF文件周边的黑色空白区块。完成单景影像处理后，即可进行镶嵌拼接。最终镶嵌采用混合镶嵌（blend mosaic）类型，该方法通过对重叠区域像元值进行横向加权计算来确定输出像元值，可有效优化输出影像的整体质量。镶嵌完成后，最后一步为创建影像金字塔并计算统计信息。