Shapefiles and Historical Aerial Photographs, Little Missouri River, 1974

4 aerial photographs were taken along the Little Missouri River in 1974. All images were geo-referenced to the 1995 digital orthophoto quarter quadrangles as described by Miller and Friedman (2009). Both the flood plain and active channel of the river were delineated on the 1995 digital orthophoto quadrangles and overlaid on rectified photos. ArcGIS was used to draw the polygons that delineate the flood plain and active channel; the delineation was saved as a SHP file. The separate images (geoTIFFs) can be viewed as a composite along with that year's channel delineation (SHP file) using a geographic information system (GIS) application. Reference: Miller, J.R., and J.M. Friedman. 2009. Influence of flow variability on flood-plain formation and destruction, Little Missouri River, North Dakota. Geological Society of America Bulletin 121:752-759.

1974年，研究人员沿小密苏里河（Little Missouri River）拍摄了4张航空摄影照片。所有影像均参照Miller与Friedman（2009）所述的1995年数字正射影像四分之一标准图幅（digital orthophoto quarter quadrangles）完成地理配准（geo-referenced）。
研究人员在该1995年数字正射影像四分之一标准图幅上勾勒出该河流的漫滩与活跃河道，并将勾勒结果叠加至经校正的航拍照片之上。研究人员使用ArcGIS软件绘制了用于界定漫滩与活跃河道的多边形要素，并将该勾勒成果保存为SHP格式文件。
使用者可通过地理信息系统（GIS, geographic information system）应用软件，将这4张独立的GeoTIFF格式影像与对应年份的河道勾勒矢量文件（SHP格式）组合为复合视图进行查看。
参考文献：Miller, J.R. 与 J.M. Friedman，2009年。北达科他州小密苏里河径流变异性对漫滩形成与消亡的影响。《美国地质学会公报》，121卷：752-759页。