spatial methods

Primary Use of Open Space and Protected Land - Ipswich Watershed - Idrisi Raster File.


This datalayer is part of a group of layers used for research in the Ipswich River Watershed. This datalayer shows the primary use of land that is defined as protected by MassGIS. ( This layer has information derived from the Protected and Recreational Open Space town coverages provided by MassGIS. To provide information about the use of open space.

Data set ID: 



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1. Download Protected and Recreational Open Space layer for each town in the watershed (

2 Add each towns ‘osp(#)p1.shp file.

3. Merge individual towns layers into one complete coverage with table for all values.

4. Union open space layer with a layer of MassGIS towns.

5. Convert to grid using “p_purp” field as value.

6. Extract to IDRISI

7. Reclass back ground values from -9999 to 0.

8. Overlay with inverse mask with a value of 10 outside the study area.

9. Reclass to switch 0 and 10 values.

10. Edit Legend.

11. Save

Process_Date: June 4, 2002


Information relevant to the GIS data encoding

The primary use of open space Horizontal 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


Progress: Complete. The ‘no information’ category contains land what is included in the Ipswich study area, but not in the MassGIS open space layers. Therefore, although this area is in the Watershed, we have no information about this land.
Maintenance and Update Frequency: This layer may be updated as MassGIS updates their coverage and new areas of open space are added.
Edition: First

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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