Ipswich Watershed

Digital Elevation Model - Ipswich Watershed - Idrisi Raster File.

Abstract: 

This datalayer is part of a group of layers used for research in the Ipswich River Watershed. This is Digital Elevation Model data for the study area, in a 30-meter grid. The source elevation tile data 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). This datalayer was produced as part of a research project concerning the Ipswich River Watershed.

Data set ID: 

252

Keywords: 

Short name: 

GIS_ip30_info_dem

Data sources: 

GIS_ip30_info_dem

Methods: 

3-meter contours created from Digital Terrain Model (DTM) data points collected during the production of 1:5,000 Black and White Digital Orthophoto images

Process_Date: before August 2001

The source elevation tile data 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).

Information relevant to the GIS data encoding

DEMHorizontal Coordinate System Name:NAD 1983 StatePlane Massachusetts Mainland FIPS 2001

Datum: D North American 1983
Reference Ellipsoid: Name: GRS 1980 Semi Axis: 6378137.0
Meridian: Greenwich
Projection Name : Lambert Conformal Conic
Number of bands : 1
Raster Origin : Lower Left
Rows : 1152
Columns : 1692
Cell Geometry :pixel

Maintenance: 

Progress: Complete. Maintenance and Update Frequency: None. Edition: Not Applicable

Metadata converted from MSWord documentation on 1.15.2013 by M. Hayn using "PIE_WordMetaConvert" package developed for conversion of data to EML 2.1.0 in R environment.

8/1/2019 corrected lat/long inversion for Ipswich Watershed boundary box

 

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