GIS

Topography Aspect - 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 the aspect model for the study area. 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). The aspect map was created using the surface analysis module. This datalayer was produced as part of a research project concerning the Ipswich River Watershed.

Data set ID: 

253

Keywords: 

Short name: 

GIS-IP-ip30_info_aspect

Data sources: 

GIS_ip30_info_aspect

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
Source: MassGIS "Elevation Contours" layer of vector data

Process_Date: before August 2001

 

Information relevant to the GIS data encoding

Aspect model for Ipswich watershedHorizontal 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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