Topography: Slope - Ipswich Watershed - Idrisi Raster File

This datalayer is part of a group of layers used for research in the Ipswich River Watershed. This is slope data for the study area. Taken from the source elevation tile data which was provided on the MassGIS website www.state.ma.us/mgis/massgis.htm in ESRI-format shapefile format and imported into IDRISI software using the ShapeIdr command. The resulting vector elevation files were converted to raster format using successive Lineras macro commands. This has the effect of mosaicing the tiles as well. The raster image was filtered once using a low-pass (mean) filter, then masked to the Ipswich study area parameters (extent). We then used the DEM to produce the slope model using the SURFACE module in IDRISI. This datalayer was produced as part of a research project concerning the Ipswich River Watershed.本数据图层隶属于用于伊普斯威奇河流域（Ipswich River Watershed）研究的一组图层集合，为本研究区域的坡度数据。本数据源自马萨诸塞州地理信息系统（MassGIS）官网（www.state.ma.us/mgis/massgis.htm）发布的原始高程瓦片数据，该数据采用ESRI格式形状文件（ESRI-format shapefile）存储，通过ShapeIdr命令导入至IDRISI地理信息系统软件中。所得矢量高程文件通过连续执行Lineras宏命令转换为栅格格式，该操作同时完成了瓦片的镶嵌拼接。随后，对生成的栅格影像使用低通（均值）滤波器进行单次滤波，并依据伊普斯威奇研究区的范围参数完成掩膜处理。最后，依托数字高程模型（Digital Elevation Model，DEM），通过IDRISI软件的SURFACE模块生成坡度模型。 本数据图层作为伊普斯威奇河流域相关研究项目的成果之一制作完成。